STATS QUESTIONS

19. Some words in a passage are particularly important for the meaning of the passage, whereas other words do not

affect the meaning substantially. A researcher believes that people primarily read the important (key) words, and

therefore that if only these words were capitalized, a passage could be read more rapidly. The researcher identifies

three groups of ten subjects each and each group is given the same passage to read. For the group Normal, the

passage is printed normally. For the group Random, a random set of words is capitalized. For the group Key, only

key words are capitalized. The dependent variable is the time to read the passage in seconds. Use α=0.05. The data

from the study is summarized below. Assume SSTR=824.60 and SSE=1157.60.

What is the experimentwise Type I error rate for the set of multiple comparisons?

A. .0167

B. .05

C. .1426

D. .8574

E. cannot be determined from the information given

21. In the lecture, we discussed a study which examined the influence of phraseology on eye witness testimony. In this study,

twenty-eight individuals watched a film of a car accident in which car A ran a stop sign and hit car B. Of the twenty-eight

participants, seven were selected at random and asked “How fast was car A going when it hit car B?” A separate set of seven

were selected at random and asked “How fast was car A going when it smashed car B?”. This was repeated with two

additional groups of seven using different phrases. This study is an example of a(n)

A. case study

B. experimental study

C. interpretive study

D. observational study

E. pilot study

F. quantum study

G. none of the above

22. An ANOVA procedure is applied to data from 6 samples where each sample contains 20 observations. The degrees of

freedom for the critical value of F are

A. 5 numerator and 19 denominator degrees of freedom

B. 5 numerator and 20 denominator degrees of freedom

C. 5 numerator and 114 denominator degrees of freedom

D. 5 numerator and 115 denominator degrees of freedom

E. 5 numerator and 119 denominator degrees of freedom

F. 5 numerator and 120 denominator degrees of freedom

G. 6 numerator and 19 denominator degrees of freedom

H. 6 numerator and 20 denominator degrees of freedom

I. 6 numerator and 114 denominator degrees of freedom

J. 6 numerator and 115 denominator degrees of freedom

K. 6 numerator and 119 denominator degrees of freedom

L. 6 numerator and 120 denominator degrees of freedom

M. 6 numerator and 20 denominator degrees of freedom

N. 4 numerator and 94 denominator degrees of freedom

O. 4 numerator and 95 denominator degrees of freedom

P. 4 numerator and 99 denominator degrees of freedom

Q. 4 numerator and 100 denominator degrees of freedom

R. None of the above

23. A hypothesis test about a single population variance is based on the __________ distribution and a hypothesis test about

the difference between two population variances is based on the __________ distribution.

A. Binomial, Poisson

B. Chi-square, F

C. F, t

D. Poisson, Negative Exponential

E. t, F

F. None of the above

24. The variance in drug weights is critical in the pharmaceutical industry. For a specific drug, with weights measured in

grams, a sample of 18 units provided a sample variance of s2=0.36. Which of the following represents the 90% confidence

interval estimate of the population variance for the weight of this drug?

A. 0.1941 to 0.7435

B. 0.1987 to 0.7250

C. 0.2022 to 0.7383

D. 0.2120 to 0.6518

E. 0.2027 to 0.8091

F. 0.2218 to 0.7057

G. None of the above

25. Investors commonly use the standard deviation of the monthly percentage return for a mutual fund as a measure of the risk

for the fund; in such cases, a fund that has a larger standard deviation is considered more risky than a fund with a lower

standard deviation. The standard deviation for the Fidelity Growth Fund was 18.9 percent and the standard deviation for the

American Century Equity Growth Fund was 15.0 percent (The Top Mutual Funds, AAII, 2009). Assume that these sample

results were each based on a sample of 61 months of returns. Do the results support the conclusion that the Fidelity fund has a

larger population variance than the American Century fund? State the test statistic for this test. Use alpha = 0.05.

A. F = 0.63, F critical = 1.53

B. F = 0.63, F critical = 1.67

C. F = 0.79, F critical = 1.53

D. F = 0.79, F critical = 1.67

E. F = 1.26, F critical = 1.53

F. F = 1.26, F critical = 1.67

G. F = 1.59, F critical = 1.53

H. F = 1.59, F critical = 1.67

I. None of the above