Gulf University for Science & Technology Department of Economics & Finance
Assignment 5 (LO iii)
ANS: C
Salary information regarding male and female employees of a large company is shown below.
Male 
Female 

Sample Size 
64 
36 
Sample Mean Salary (in $1,000) 
44 
41 
Population Variance () 
128 
72 
ANS: D
ANS: D
The following information was obtained from matched samples.
The daily production rates for a sample of workers before and after a training program are shown below.
Worker  Before  After 

1  20  22 
2  25  23 
3  27  27 
4  23  20 
5  22  25 
6  20  19 
7  17  18 
ANS: B
Exhibit 10 3
A statistics teacher wants to see if there is any difference in the abilities of students enrolled in statistics today and those enrolled five years ago. A sample of final examination scores from students enrolled today and from students enrolled five years ago was taken. You are given the following information.
82 88
^{2} 112.5 54 n 45 36
The following information was obtained from independent random samples. Assume normally distributed populations with equal variances.
Sample 1 Sample 2
Sample Mean 45 42
Sample Variance 85 90
Sample Size 10 12
ANS: A
The management of a department store is interested in estimating the difference between the mean credit purchases of customers using the store's credit card versus those customers using a national major credit card. You are given the following information.
Store's Card 
Major Credit Card 

Sample size 
64 
49 
Sample mean 
$140 
$125 
Population standard deviation 
$10 
$8 
Two major automobile manufacturers have produced compact cars with the same size engines. We are interested in determining whether or not there is a significant difference in the MPG (miles per gallon) of the two brands of automobiles. A random sample of eight cars from each manufacturer is selected, and eight drivers are selected to drive each automobile for a specified distance. The following data show the results of the test.
Driver  Manufacturer A  Manufacturer B 

1  32  28 
2  27  22 
3  26  27 
4  26  24 
5  25  24 
6  29  25 
7  31  28 
8  25  27 
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