Test
9
AP
Statistics
Name:
Directions:
Work on these sheets. Answer completely, but be concise.
Part 1: Multiple Choice.
Circle the letter corresponding to the best answer.
1.
In a study of the effects of acid rain, a random sample of 100 trees from a particular
forest is examined. Forty percent of these show some signs of damage. Which of the
following statements is correct?
B
a.
40% is a parameter
b.
40% is a statistic
c.
40% of all trees in the forest show some signs of damage
d.
More than 40% of the trees in the forest show some signs of damage
e.
Less than 40% of the trees in the forest show some signs of damage
2.
Refer to the previous problem. Which of the following statements is correct?
A
a.
The sampling distribution of the proportion of damaged trees is approximately normal
b.
If we took another random sample of trees, we would find that 40% of these would show
some signs of damage
c.
If a sample of 1000 trees was examined, the variability of the sample proportion would be
larger than in a sample of 100 trees
d.
This is a comparative experiment
e.
None of the above
3.
Which of the following statements is (are) true?
I.
The sampling distribution of has standard deviation even if the population is not normally
distributed.
II.
The sampling distribution of is normal if the population has a normal distribution.
III.
When n is large, the sampling distribution of is approximately normal even if the
population is not normally distributed.
D
a.
I and II
b.
I and III
c.
II and III
d.
I, II, and III
e.
None of the above gives the correct set of responses.
4.
Suppose we are planning on taking an SRS from a population. If we double the sample
size, then will be multiplied by:
B
(a)
(b)
c.
2
d.
e.
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 Spring '11
 MR.Smith

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