MATH221 Quiz Week 3

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MATH221 Quiz Week 3
A survey of 1272 pre-owned vehicle shoppers found that 8% bought the extended…

 

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MATH221 Quiz Week 3

MATH221 Quiz Week 3

A+ Formulas Included

Question 1

(CO 1) A survey of 1272 pre-owned vehicle shoppers found that 8% bought the extended warranties. What is the population and what is the sample?

Population: 1272 pre-owned Vehicle shoppers; Sample: the 8% that bought extended warranties

Population: 1272 pre-owned Vehicle shoppers; Sample: pre-owned vehicle shoppers

Population: pre-owned vehicle shoppers; Sample: the 8% that bought extended warranties

Population: pre-owned vehicle shoppers; Sample: 1272 pre-owned vehicle shoppers

Question 1

A survey of 128 DeVry statistics students found that 83% read the announcements each week. What is the population and what is the sample?

Population: DeVry statistics students; sample: the 83% that read the announcements weekly

Population: all statistics students; Sample 128: DeVry statistics students

Population: DeVry statistics students: Sample: 128 DeVry Statistics students

Population: all statistics students reading announcements weekly; Sample: the 128 DeVry statistics students

Question 1

Among 500 people at the concert, a survey of 35 found 28% found it too loud. What is the population and what is the sample?

Population: 500 at that concert; sample: the 35 in the survey

Population: all concert goers; sample: the 28% who found it too loud

Population: 500 at that concert: Sample: the 28% who found it too loud

Population: all concert goers; Sample: the 500 at that concert

Question 2

(CO 1) A survey of 481 of your customers shows that 79% of them like the recent changes to the product. Is this percentage a parameter or a statistic and why?

Statistics as it represents the population

Parameter as it represents the sample

Statistic as it represents the sample

Parameter is it represents the population

Question 2

The measurements of 100 products from the assembly line show that 99% are correct. Is this percentage a parameter or a statistic and why?

Parameter as it represents the sample

Statistic as it represents the sample

Parameter as it represents the population

Statistic as it represents the population

Question 2

The measurements of 100 products from the assembly line show that 99% are correct. Is this percentage a parameter or a statistic and why?

Parameter as it represents the sample

Statistic as it represents the sample

Parameter as it represents the population

Statistic as it represents the population

Question 3

In asking all 349 second graders in a school district, it is found that on average, these second graders have 2.5 pets. Is this number a parameter or a statistic and why?

Statistic as it represents the population

Statistic as it represents the sample

Parameter as it represents the population

Parameter as it represents the sample

Question 3

Classify the data of the top grossing movies for 2017.

Qualitative

Quantitative

Classical

Statistics

Question 3

Classify the data of the heights of ladders produced by a tool company.

Qualitative

Statistics

Classical

Quantitative

Question 4

The data set that lists the number of performances for each Broadway show in 2017 would be classified as what type of data?

Ordinal

Ratio

Nominal

Interval

Question 4

The data set that lists the runs scored at each of the weekend’s baseball games would be classified as what type of data?

Interval

Ratio

Nominal

Ordinal

Question 4

The data set that lists the temperatures in Albany NY each day in the month of February would be classified as what type of data?

Ratio

Ordinal

Nominal

Interval

Question 5

A data set that includes the values given by customers to determine their level of satisfaction with their purchases. The scale used is very satisfied, somewhat satisfied, somewhat dissatisfied, and very dissatisfied. The data of the customer responses would be classified as what type of data?

Ratio

Nominal

Ordinal

Interval

Question 5

A data set that includes the number of products that were produced within each hour by a company would be classified as what type of data?

Nominal

Ratio

Interval

Ordinal

Question 5

A data set that includes the years in which your hometown team won championships would be classified as what type of data:

Ordinal

Nominal

Interval

Ratio

Question 6

What type of data collection might be best to estimate the impact of exercise on longevity?

Observational

Survey

Experiment

Simulation

Question 6

What type of data collection might be best to estimate the amount of time individuals spend socializing?

Simulation

Experiment

Survey

Observational

Question 7

What type of data collection might be best to study how many books students bring into the media center during finals week?

Simulation

Survey

Observational

Experiment

Question 7

What type of data collection might be best to study how voters might decide an upcoming ballot issue?

Experiment

Survey

Simulation

Observational

Question 8.

You need to study the satisfaction of customers of a specific restaurant. You decide to order food and talk to those customers sitting next to you. This would most closely describe which type of sampling technique?

Convenience

Systematic

Stratified

Random

Question 8

You need to study the satisfaction of customers of a specific restaurant. You ask every 10th customer as they leave after their meal. This would most closely describe which type of sampling technique?

Systematic

Stratified

Convenience

Random

Question 8

You need to study the satisfaction of customers of a specific restaurant. You ask every 10th customer as they leave after their meal. This would most closely describe which type of sampling technique?

Systematic

Convenience

Random

Stratified

Question 9

Which of the following graphs would be a histogram?

Question 9

Which of the following graphs would be a dot plot?

Question 9

Which of the following graphs would be a line graph?

Question 10

In a normally distributed data set of how long customers stay in your store, the mean is 31.7 minutes and the standard deviation is 1.9 minutes. Within what range would you expect 95% of your customers to stay in your store?

30.75-32.7

26.0-37.4

29.8-33.6

27.9-35.5

Question 10

In a normally distributed data set of how long customers stay in your store, the mean is 50.3 minutes and the standard deviation is 3.6 minutes. Within what range would you expect 95% of your customers to stay in your store?

39.5-61.1

43.1-57.5

46.7-53.9

48.5-52.1

Question 11

Which of the following graphs would be considered right skewed?

Question 11

Which of the following graphs would be considered normally distributed?

Graph 1

Graph 2

Graph 3

Graph 4

Question 11

Which of the following graphs would be considered normally distributed?

Question 12

In a normally distributed data set with a mean of 19 and a standard deviation of 2.6, what percentage of the data would be 13.8 and 24.2?

68% based on the histogram

95% based on the histogram

95% based on the empirical rule

68% based on the empirical rule

Question 12

In a normally distributed data set with a mean of 22 and a standard deviation of 4.1, what % of the data would be between 13.8 and 30.2

95% based on the histogram

68% based on the histogram

68% based on empirical rule

95% based on empirical rule

Question 12

In a normally distributed data set with a mean of 22 and a standard deviation of 4.1, what percentage of data would be between 17.9 and 26.1?

99.7% based on empirical rule

68% based on the histogram

68% based on the empirical rule

95% based on the empirical rule

Question 13

Which of the following would be the standard deviation for this sample data set: 5,7,3,9,2,4,4,9,5,9,3?

5.45

2.50

2.62

2.73

Question 13

Which of the following would be the standard deviation for this sample data set: 5,7,6,9,4,4,6,5,2,5?

2.68

1.72

5.36

1.80

Question 13

Which of the following would be the standard deviation for this sample data set: 5,7,3,9,2,4,4,9,5,9,3

2.73

5.45

2.50

2.62

Question 14

What would be the mean of this data set? 8,9,7,451,7,1,5,3,4?

27.5

55.0

55.3

75.3

Question 14

What would be the mean of this data set: 8,9,7,508,7,.1,5,8,1?

33.8

50.8

5.8

61.6

Question 15

A pharmaceutical company wants to determine If its new medicine helps heal bruises more quickly than not treating the bruise. What type of study would be best suited to make this determination?

Simulation

Experimental

Survey

Observational

Question 15

A city wants to know how many cars come to a complete stop at the stop signs in downtown? What type of study would be best suited to make this determination?

Observational

Simulation

Experimental

Survey

Question 16

To gather information on customer satisfaction, a researcher goes into several stores and interviews randomly selected customers. This sampling technique is called:

Stratified

Convenience

Random

Cluster

Question 16

To gather information on customer satisfaction, a researcher goes into the local store and interviews six randomly selected customers. This sampling technique is called:

Stratified

Random

Cluster

Convenience

Question 16

To gather information on customer satisfaction, a researcher randomly selects four store locations and interviews all the customers at those selected stores. This sampling technique is called:

Convenience

Stratified

Cluster

Random

MATH221 Quiz Week 3

Question 17

What is the standard deviation and its meaning given this population of customer ages? 45,76,30,22,51,40,63,66,41?

17.5 which means that many of the ages will be around the square of this value

16.5 which means that many of the ages will be around this value

17.5 which means that many of the ages will be within this value of the average age

16.5 which means that many of the ages will be within this value of the average age

Question 17

What is the standard deviation and its meaning given the population of customer ages? 45, 76, 30, 22, 24, 40, 63, 66, and 27

20.2 which means that many of the ages will be around the square of this value

19.0 which means that many of the ages will be around this value

20.2 which means that many of the ages will be within this value of the average age

19.0 which means that many of the ages will be within this value of the average age

Question 18

A random selection from a deck of cards selects one card. What is the probability of selecting an ace?

0.025

0.250

0.50

0.077

Question 18

A random number generator is used to select a number from 1 to 100. What is the probability of selecting an even number?

0.25

0.95

0.50

0.005

Question 18

A random number generator is used to select a number from 1 to 100. What is the probability of selecting an even number?

0.005

0.25

0.95

0.50

Question 19

What is the sample space to responses to a question whose answers are Yes or No, along with a question on location with possible answers of North, South, East, or West?

Yes no north south east west

Yes yes no no north north south south east east west west

Yes north yes south yes east yes west yes no no north no south no east no west

Yes north yes south yes east yes west no north no south no east no west

MATH221 Quiz Week 3

Question 19

What is the sample space to responses to a question whose answers are up, down, left or right along with a question on preference between blue and red?

Up blue up red down blue down red left blue left red right blue right red

Up blue up blue down blue down blue left blue left blue right blue right blue

Up up down down left left right right blue blue red red

Up down left right blue red

Question 20

Consider the table below

Response (number of cats owned | Frequency

None | 659

One | 329

Two | 52

Three | 13

Four or more | 8

What is the probability that the next person asked only has two cats?

5%

31%

62%

50%

Question 20

Consider the table below

Response (number of cats owned)Frequency
None659
One329
Two52
Three13
Four or more8

What is the probability that the next person asked has only one cat?

62%

50%

5%

31%

Question 21

Consider the table below

Age group | Frequency

18-29 | 9831

30-39 | 7845

40-49 | 6869

50-59 | 6323

60-69 | 5410

70 and over | 5279

23.7%

42.5%

28.2%

31.7%

Question 21

Consider the table below

Age groupFrequency
18-299831
30-397845
40-496869
50-596323
60-695410
70 and over5279

What is the probability that the next person chosen will be in the 18-29 or 30-39 age groups?

23.7%

37.8%

42.5%

18.9%

Question 22

According to company records, the probability that a dishwasher will need repairs during its first six years is 0.09. this is an example of which type of probability?

Empirical probability

Public probability

Subjective probability

Classical probability

MATH221 Quiz Week 3

Question 22

When children roll a die for a game, their probability of rolling a 5 is 17%. This is an example of which type of probability?

Empirical probability

Public probability

Classical probability

Subjective probability

Question 23

Consider the table below:

Age group | frequency

18-29 | 9831

30-39 | 7845

40-49 | 6869

50-59 | 6323

60-69 | 5410

70 and over | 5279

What is p (40-59’)?

68.3

31.7

64.6

71.8

Question 23

Consider the table below.

71.8%

25.7%

64.6%

74.3%

Question 23

Consider the table below.

Age groupFrequency
18-299831
30-397845
40-496869
50-596323
60-695410
70 and over5279

What is P(50-69’)?

76.3%

64.6%

68.3%

71.8%

Question 24

You are selling your product at a 3 day event. Each day, there is a 60% chance that you will make money. What is the probability that you will make money all three days?

0.288

0.216

0.096

0.144

Question 25

Consider the table below.

ProfitLossTotal
Urban location503888
Rural location6184125
Total111132243

Find the probability that a randomly selected location is going to be profitable, given that it is in an urban location.

36.2

56.8

48.8

51.4

Question 25

36.2%

28.8%

55.0%

48.8%

Question 25

Consider the table below.

ProfitLossTotal
Urban Location503888
Rural Location6184125
Total111132243

Find the probability that a randomly selected location is going to be profitable, given that it is in an urban location.

48.8%

36.2%

51.4%

56.8%

MATH221 Quiz Week 3

Question 26

Consider the table below:

Find the probability that a random selected product is from the north, given that it is correct.

87.2

88.9

12.1

36.4

Question 26

Consider the table below.

Find the probability that a random selected product is defective, given that it is from the south production facility.

10.7%

12.8%

13.1%

23.7%

Question 26

Consider the table below.

Production locationCorrectDefectiveTotal
East25831289
West572106678
NORTH75594849
SOUTH49174565
TOTAL20763052381

34.8%

84.4%

28.5%

15.6%

Question 27

Classify these events. Selecting a king from a deck of cards, replacing it and selecting a queen from the same deck. These events would be considered:

Independent

Empirical

Subjective

Dependent

Question 27

Classify these events. Selecting a king from a deck of cards, keeping it and selecting another king from the same deck. These events would be considered:

Dependent

Independent

Subjective

Empirical

Question 28

Classify these events. Some of the businesses have large stores and some businesses have large parking lots. These events would be considered:

Subjective

Independent

Dependent

Classical

MATH221 Quiz Week 3

Question 28

Classify these events. A study found that people who suffer from stress are more likely to have health issues. These events would be considered

Dependent

Subjective

Independent

Classical

Question 29

In a survey of 331 customers, 66 say that service is poor. You select two customers without replacement to get more information on their satisfaction. What is the probability that both say service is poor?

3.93

19.70

3.88

4.00

Question 29

In a survey of 320 customers, 58 say that service is poor. You select two customers without replacement to get more information on their satisfaction. What is the probability that both say service is poor?

3.20%

3.24%

3.19%

3.29%

Question 29

In a survey of 320 customers, 84 say that service is poor. You select two customers without replacement to get more information on their satisfaction. What is the probability that both say service is poor?

6.83%

6.81%

6.89%

21.25%

Question 30

Randomly select a customer that takes the bus to our store. Randomly select a customer that is a teenage. Are these events mutually exclusive?

Mutually exclusive events

Non-mutually exclusive events

Question 30

Randomly select a customer that purchases tofu. Randomly select a customer that purchases chicken. Are these events mutually exclusive?

Mutually exclusive events

Non-mutually exclusive events

MATH221 Quiz Week 3

DeVry