Stats Test 1.1

Front 1

You are less likely to be misled by a graph if you:

Back 1

focus your attention on the numerical values that the graph represents and avoid being influenced by the graph's caption.

Front 2

The classification of student major (accounting, economics, management, marketing, other) is an example of:

Back 2

a categorical random variable.

Front 3

The strength of the linear relationship between two numerical variables may be measured by the:

Back 3

coefficient of correlation.

Front 4

The total area of the five bars in a relative frequency histogram for which the width of each bar is nine units is:

Back 4

9.

Front 5

The two graphical techniques we usually use to present interval data are:

Back 5

histogram and ogive.

Front 6

Which of the following statistics is not a measure of central tendency?

Back 6

interquartile range

Front 7

Air France Internet site provides a questionnaire instrument that can be answered electronically. Which method of data collection is involved when people complete the questionnaire?

Back 7

surveying

Front 8

In general, incomes of employees in large firms tend to be:

Back 8

positively skewed.

Front 9

The length of the box in the box-and-whisker plot portrays the:

Back 9

interquartile range.

Front 10

A company has developed a new computer sound card, but the average lifetime is unknown. In order to estimate this average, 200 sound cards are randomly selected from a large production line and tested and the average lifetime is found to be 5 years. The 5 years represent the:

Back 10

statistic.

Front 11

A perfect straight line sloping downward would produce a correlation coefficient equal to:

Back 11

-1

Front 12

In general, the scatter diagram of two interval variables may reveal that:

Back 12

All of these choices are true statements.

Front 13

A university employs 2500 faculty and staff. To ascertain how the employees feel regarding a health insurance plan, 250 of the employees are surveyed. The 250 employees who were surveyed constitute a sample.

Back 13

True

Front 14

In a set of numerical data with bell shaped histogram, the value for Q2 is always halfway between Q1 and Q3

Back 14

True

Front 15

The interquartile range is found by taking the difference between the 1st and 3rd quartiles.

Back 15

True

Front 16

When every possible sample with the same number of observations is equally likely to be chosen, the selected sample is called:

Back 16

simple random sample.

Front 17

Which of the following statements is false?

Back 17

All calculations are permitted on nominal data.

Front 18

Since the population is always larger than the sample, the population mean:

Back 18

can be smaller than, or larger than, or equal to the sample mean.

Front 19

A summary measure that is computed from a sample to describe a characteristic of the population is called a parameter.

Back 19

False

Front 20

The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who have purchased a videocassette recorder made by the company over the past 12 months are satisfied with their products. If there are 4 different brands of videocassette recorders made by the company, the best sampling strategy would be to use a:

Back 20

stratified sample.