Test 10D
AP Statistics
Name:
Directions:
Work on these sheets.
A Normal probability table and a t table will be provided.
Part 1:
Multiple Choice.
Circle the letter corresponding to the best answer.
1.
The heights (in inches) of males in the United States are believed to be Normally distributed with
mean
µ
. The average height of a random sample of 25 American adult males is found to be
x
= 69.72 inches, and the standard deviation of the 25 heights is found to be
s
= 4.15. The standard
error of
x
is
(a) 0.17
(b) 0.69
(
c)
0.83
(d) 1.856
(e) 2.04
2.
You want to estimate the mean SAT score for a population of students with a 90% confidence
interval.
Assume that the population standard deviation is
σ
= 100.
If you want the margin of
error to be approximately 10, you will need a sample size of
(a) 16
(b) 271
(c) 38
(d) 1476
(e)
None of the above.
The answer is
.
3.
Which of the following is an example of a paired data design?
(a) A teacher compares the pretest and posttest scores of students.
(b) A teacher compares the scores of students using a computerbased method of instruction with the
scores of other students using a traditional method of instruction.
(c) A teacher compares the scores of students in her class on a standardized test with the national
average score.
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 Spring '11
 Smith
 Statistics, Normal Distribution, Probability, Standard Deviation, Gallup poll

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