# MATH221 Homework Week 1

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MATH221 Homework Week 1
A recent survey of the alumni of a university indicated that the average salary of 10,000…

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## MATH221 Homework Week 1

MATH221 Homework Week 1

DeVry A+

Question 1

A recent survey of the alumni of a university indicated that the average salary of 10,000 of its 200,000 graduates was \$130,000. The \$130,000 would be considered a:

Population

Sample

Statistic

Parameter

Question 2

Of all DeVry students, a study found that 43% of them are business majors. The 43% would be considered a:

Parameter

Sample

Statistic

Population

Question 3

The average age of students in a statistics class is 28 years. The 28 years would be considered an example of:

Qualitative data

Inferential statistics

Descriptive statistics

A population

Question 4

The ages of 20 first graders would be considered:

Quantitative data

Nominal data

Qualitative data

Interval data

Question 5

The ratings of 50 movies would be considered:

Ratio data

Quantitative data

Interval data

Ordinal data

Question 6

The final grades for students in a statistics class would be considered:

Interval data

Ordinal data

Nominal data

Ratio data

Question 7

A researcher randomly selects and interviews fifty male and fifty female teachers. This sampling technique is called:

Convenience

Stratified

Random

Cluster

Question 8

A personnel director at a large company would like to determine whether the company cafeteria is widely used by employees. She calls each employee and asks them whether they usually bring their own lunch, eat at the company cafeteria, or go out for lunch. This study design would be considered:

Simulation

Survey

Observational

Experimental

Question 9

Which of the following would be the mean of this data set: 5, 7, 12, 36, 14, 12, 33, 21

17.5

11.6

11.6

13.00

Question 10

Which of the following would be the standard deviation of this sample data set: 67, 54, 30, 77, 61, 41, 75, 83

17.3

61.0

18.4

340.3

Question 11

Which of the following would be the variance of this population data set: 3, 6, 8, 9, 4, 5, 7, 1, 9, 7, 5, 4, 13, 9

8.82

9.49

2.97

12.00

Question 12

If a data set is right skewed, where would the mean be in relation to the mode?

At a lower value

At the same value

At a higher value

Right skewed distributions don’t have a mean nor mode

Question 13

If data set A has a larger mean than data set B, what would be different about their distributions?

The distribution of data set A would generally be to the left of the distribution of data set B

The distribution of data set A would generally be to the right of the distribution of data set B

Data set A would have flatter distribution with more data in each tail

Data set A would have more data near the center of the distribution

Question 14

In a normally distributed data set with a mean of 24 and a standard deviation of 4.2, what percentage of the data would be between 15.6 and 32.4 and why?

68% based on the Empirical Rule

68% based on the histogram

95% based on the histogram

95% based on the Empirical Rule

Question 15

Which of the following data sets would you expect to have the highest standard deviation?

Weight of an orange (in ounces)

Ages of people taking college classes (in years)

Amount of soda in an unopened can (in ounces)

The number of phones a person owns

Question 16

Which data outcome of the number of customers in line would best support opening another cash register?

Low mean with small standard deviation

High mean with high standard deviation

High mean with small standard deviation

Low mean with high standard deviation

Question 17

In manufacturing, systematic sampling could be used to determine if the machines are operating correctly. Which of the following best describes this type of sampling?

Products are put into groups and some are randomly selected from each group

Every 10th product in the line is selected

Products are put into groups and all are included from several randomly selected groups

Samples are randomly selected throughout the day

Question 18

A graph shows a number line with a mark for each data value in the data set above its value. This graphic is most likely to be:

A frequency histogram

A dot plot

A stem-leaf plot

A frequency polygon

Question 19

Match the terms and their definitions

Vertical bar chart that shows frequency on the y-axis

A sample where the population is divided into groups and several groups are randomly selected from all from those selected groups are sampled

Collection of all counts that are of interest

A subset or part of a population

A sample where the population is divided into groups and several are randomly sampled form each group

Consists of attributes, labels, or nonnumerical entries

Question 20

Match the terms and their definitions

The most frequent number appearing in a dataset

The average

The percentage of data that falls within 1, 2, or 3 standard deviations of the mean in a symmetrical, bell-shaped distribution

The square root of the variance

Show how far a particular data point is from the mean in terms of the number of standard deviations

MATH221 Homework Week 1

DeVry