1.
The standard deviation of the diameter at breast height, or DBH, of the slash pine tree is less than one
inch. Identify the Type I error. (Points : 1)
Fail to support the claim σ < 1 when σ < 1 is true.
Support the claim μ < 1 when μ = 1 is true.
Support the claim σ < 1 when σ = 1 is true.
Fail to support the claim μ < 1 when μ < 1 is true.
2.
Use the following sample sizes and numbers of successes for this question.
Medical researchers reviewing the risk of death for elderly patients taking dementia drugs found the
following data. Assume a .05 significance level for testing the claim that the proportions are not equal.
Also, assume the two simple random samples are independent and that the conditions np ≥ 5 and nq ≥ 5 are
satisfied.
Dementia Drugs
Placebo
Number of patients
500
450
Total deaths
23
12
Construct a 95% confidence interval estimate of the odds ratio of the odds for death in the placebo group to the odds
for death in the dementia drugs group. Give your answer with two decimals, e.g., (12.34,56.78) (Points : 0.5)
3.
Ophthalmologists studying the treatment of using an infrared laser procedure in ten patients with vision
loss caused by dry age-related macular degeneration (AMD) found the following data on visual acuity (VA)
before and after the procedure. Assume a .05 significance level to test the claim that there is a difference
between the number of VA lines that can be read by individuals before and after the procedure. Also,
assume the data consist of matched pairs, the samples are simple random samples, and the pairs of values
are from a population having a distribution that is approximately normal.
Individual
1
2
3
4
5
6
7
8
9
10
VA Lines Read Before
3
4
2
4
5
3
4
5
3
3
Laser Procedure
VA Lines Read After
4
4
5
5
6
3
7
6
3
5
Laser Procedure
Find the t test statistic. Give your answer with two decimals, e.g., 9.87 . (Points : 0.5)

4.
Given: There is a linear correlation coefficient very close to 0 between mothers who smoked during
pregnancy and the incidence of influenza in their babies. Identify the choice below that contains a
conclusion with a common correlation error. (Points : 1)
Conclusion: the frequency of mothers' smoking is not related in any way to the incidence of influenza in
their babies
Conclusion: an increase in the frequency of mothers' smoking is not linearly related to an increase in the
incidence of influenza in their babies
Conclusion: a decrease in the frequency of mothers' smoking is not linearly related to a decrease in the
incidence of influenza in their babies
Conclusion: there is not a linear relationship between the frequency of mothers' smoking and the incidence
of influenza in their babies
5.
Use a .05 significance level and the observed frequencies of 144 drownings at the beaches of a randomly
selected coastal state to test the claim that the number of drownings for each month is equally likely.
Jan
Feb
Mar
Apr
May
June
July
Aug
Sept
Oct
Nov
Dec
1
3
2
7
14
20
37
33
16
6
2
3
Do you reject the null hypothesis, at the .05 significance level? Enter Y for yes (reject), N for no (fail to reject).
(Points : 0.5)
6.
Using a .01 significance level, test the claim that the proportions of people who favor/oppose pro-choice
on the abortion issue are the same for the males and females.
Gender
Male
Female
Favor Pro-Choice
65
120
Oppose Pro-Choice
42
38
Determine the value of the χ
2
test statistic. Give your answer to two decimals, e.g., 12.34 . (Points : 0.5)