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COURSE:
MSCI 3710
Print Name:
EXAM 1
Signature:
Version B
S.S.#:
SEMESTER: Summer II 1999 Seat Number:
Note: Whenever question(s) are connected you may be asked to assume a
result (given a value) from the previous question but this result may or may
not be correct.
This is to prevent you from losing points on a second question
because you made a mistake on a previous question.
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View Full Document Use the information given in the following paragraph to answer the next eight questions.
Your company has recently purchased 167 new automobiles for your salesmen.
Part of the
reason you selected these cars was because of the gas milage and large tanks; the cars were
advertised to get 430 miles from a full tank of gas.
You believe that these cars are not getting
this amount.
You had your salespeople track the milage on their cars, and learned the following:
Sample mean: 421 miles per tank
Sample Standard deviation: 10.7
1.
What kind of test would be most appropriate for this data to test your belief?
A.
ZTest for Population Mean *
B.
TTest for Population Mean
C.
Analysis of Variance for Single Sample
D.
Paired TTest
E.
Hypothesis test for Population Proportion
2.
What is the best set of hypothesis for testing your belief?
A.
Ho: μ <
421 Ha: μ > 421
B.
Ho: μ <
430 Ha: μ > 430
C.
Ho: μ < 430 Ha: μ >
430
D.
Ho: μ > 421 Ha: μ < 421
E.
Ho: μ >
430 Ha: μ < 430 *
3.
What is the calculated value of the test statistic for this data?
A.
9
B.
10.87 *
C.
140.467
D.
.8411
E.
421
4.
Assume that the calculated value of the test statistic is 1.84 and that this is a onetailed test.
To what pvalue does this correspond?
A.
.4671
B.
.0329 *
C.
.2289
D.
.4671
E.
.0529
5. Assume that the pvalue is .087 and the significance level was 10% for this onetailed test.
What would you conclude?
A.
Conclude that there is insufficient evidence that the cars get less than 430 miles per tank
on average because the difference between the mean and advertised level is less than the
standard deviation.
B.
Conclude that there is evidence that the cars get less that 430 miles per tank on average
because the mean of 421 is less than the advertised level of 430.
C.
Conclude that there is evidence that the cars get less than 430 miles per tank on average
because the pvalue is below the level of significance. *
D.
Conclude that there is insufficient evidence that the cars get less than 430 miles per tank
on average because the pvalue is below the level of significance.
E.
There is not enough information to draw a conclusion.
6.
Assume that you determine the number of miles per tank, on average, is less than the
advertised level (at the 10% level of significance) and demand compensation.
If you then learn
that the advertised level is only valid with Super Premium gasoline (and you have not been using
that), what have you most likely done?
A.
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This note was uploaded on 03/09/2011 for the course DSCI 3710 taught by Professor Dr.jay during the Spring '08 term at North Texas.
 Spring '08
 Dr.Jay

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