This practice exam consists of 25 multiple choice questions and is similar (in format, types of questions, etc.) to the exam you will take for credit. The time limit for all module exams is 2 hours. It is recommended that you take this practice exam under exam conditions in order to prepare for the module exam. When you are finished with the exam you can check your answers by clicking here.  The module exams are worth 100 points (4 points per question).
 

The next three questions refer to the following situation. A random sample of 210 receipts from a particular fast-food restaurant was selected and the amount spent (in dollars) for the given meal was recorded for each. The data is partially summarized in the following table.
 

1.) What are the missing frequency and cumulative relative frequency respectively?

a. 40, 0.457
b. 40, 0.714
c. 84, 0.809
d. 84, 0.714
e. 170, 0.809

2.) What percentage of receipts are strictly below $2.00?

a. 31.4%
b. 40.0%
c. 49.5%
d. 71.4%
e. 80.9%

3.) The 95^th percentile is in what class?

a. 0.00 - 0.99
b. 1.00 - 1.99
c. 2.00 - 2.99
d. 3.00 - 3.99
e. 4.00 - 4.99
 

The next two questions refer to the following situation. Suppose a simple random sample of price-earnings ratios for a set of stocks, whose prices are quoted by the National Association of Security Dealers Automated Quotations (NASDAQ), was collected. A stem-and-leaf diagram of the data is presented below.

4.) What is the median price-earnings ratio?

a. 22.8
b. 9
c. 21
d. 16
e. 25

5.) What is the shape of the price-earnings ratio data?

a. Symmetric
b. Uniform
c. Skewed Left
d. Skewed Right
e. Bell Shape
 

The next two questions refer to the following situation. Before microwave ovens are sold, the manufacturer must check to ensure that the radiation coming through the door is below a specified safe limit. The amount of radiation leakage (mw/cm2), with the door closed, from 5 randomly selected ovens are given below.

6.) What are the mean and median for the radiation leakage data respectively?

a. 57.0, 9.0
b. 11.4, 9.0
c. 57.0, 10.0
d. 11.4, 10.0
e. 9.0, 10.0

7.) What is the standard deviation of the radiation leakage data?

a. 13.74
b. 21.04
c. 5.13
d. 4.59
e. 26.30
 

The next three questions refer to the following situation. A random sample of 40 movies was taken and the length of the movie (in minutes) was observed for each. The data was summarized with the following frequency histogram.
 
 

8.) What percentage of movies last less than 90 minutes?

a. 20
b. 105
c. 90
d. 80
e. 15

9.) The lower quartile (Q1) is contained in which of the following intervals?

a. (80, 90)
b. (85, 90)
c. (90, 95)
d. (105, 110)
e. (75, 85)

10.) What is the range of the data?

a. 60
b. 12
c. 13
d. 30
e. 100
 

11.) Which of the following statements best describes the relationship between a statistic and a parameter?

a. A statistic is fixed and a parameter is random.
b. A statistic estimates a parameter.
c. Both statistics and parameters are random variables.
d. A parameter is used to estimate a statistic.
e. A statistic is unobservable but a parameter can be observed.
 

The next two questions refer to the following situation. A random sample of firms in the food and beverage industry was selected. The amount of money (in millions of dollars) that was spent on research and development in the preceding year was recorded. The data was entered into a statistical software package and the following boxplot of the data was created.

a. 25.0, 36.0, 48.0, 60.0, 74.0
b. 24.0, 36.0, 48.0, 60.0, 72.0
c. 25.2, 39.6, 50.4, 60.0, 74.4
d. 39.6, 44.4, 50.4, 55.2, 60.0
e. 20.1, 25.0, 40.2, 50.0, 60.0

13.) Using the Range Rule of Thumb, what is an approximation for the standard deviation of the amounts spent?

a. 12
b. 19
c. 50
d. 6
e. 144
 

The next two questions refer to the following situation. A particular long distance telephone company randomly selected 200 of its' monthly telephone bills for observation. The amount spent on long distance telephone calls is partially summarized in the following table.
 

14.) What are the missing relative frequency and cumulative relative frequency respectively?

a. 0.065, 0.700
b. 0.935, 0.695
c. 0.130, 0.700
d. 0.065, 0.050
e. 0.065, 0.750

15.) What percentage of long distance telephone bills are $75 or more?

a. 79%
b. 35%
c. 30%
d. 9%
e. 21%

The next two questions refer to the following situation. The data from 95 measurements of the traffic noise level (in decibels) at a particular intersection were recorded and entered into a statistical software package. The package produced the following dotplot of the sample data.

a. 24
b. 40
c. 28
d. 30
e. 44

17.) What is the best approximation for the standard deviation of the traffic noise data?

a. 51.0
b. 18.7
c. 4.3
d. 11.0
e. 121.0
 

18.) Which of the following statements concerning the sample standard deviation is true?

a. The standard deviation is the square of the variance
b. The standard deviation is a measure of location
c. The standard deviation is a measure of spread and is not sensitive to outliers
d. The standard deviation is equal to the range divided by four
e. The standard deviation is a measure of spread and is sensitive to outliers.
 

The next two questions refer to the following situation. A simple random sample of 4 patients at a particular dentist office was taken. The waiting times (in minutes) for the 4 patients were observed and are given below.

19.) What are the sample mean and median respectively?

a. 96, 24
b. 24, 24
c. 32, 21
d. 96, 29
e. 24, 29

20.) What is the sample standard deviation?

a. 38.67
b. 88.94
c. 3.50
d. 6.22
e. 10.77

The next two questions refer to the following situation. A marketing consultant randomly observed 50 shoppers at a particular grocery store. The amount of money each shopper spent in the store was observed and a frequency histogram of the data was constructed. The histogram is presented below.

21.) The median amount spent by these shoppers is in what interval?

a. 25 to 30
b. 20 to 25
c. 15 to 20
d. 10 to 15
e. 30 to 35

22.) What is the percentage of people that spend between $10 and $30?

a. 28%
b. 38%
c. 24%
d. 56%
e. 76%
 

For the following two questions, use following boxplot.

a. 2.5
b. 5
c. 15
d. 25
e. 12.5

24.) Describe the shape of the data.

a. skewed left
b. skewed right
c. positive skewed
d. uniform
e. symmetric
 

25.) A local telephone company is conducting a study of consumer preferences. Some variables of interest include: type of telephone, ownership of a cordless phone, length (in minutes) of local calls per month, and monthly charges (in dollars and cents). Which of these variables are qualitative?

a. length of local calls per month
b. type of telephone and length of local calls per month
c. only type of telephone
d. type of telephone and ownership of a cordless phone
e. length of local calls per month and monthly charges

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