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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