Statistics

Statistics

1. Question 1
For which of the following would the samples be considered dependent? A study to compare:
a. Husbands and their wives with regard to political attitudes.
b. Current freshmen and freshmen 10 years ago, all of whom are (were) psychology majors, with regard to SAT scores.
c. Current freshmen and freshmen 10 years ago (a mixture of many academic majors) with regard to SAT scores.
d. None of the above involve dependent samples.
2. Question 2 (Points: 10)
We wish to test the hypothesis of no difference between the means of two dependent groups. There are 30 cases in the first sample, and 30 cases in the second. The number of degrees of freedom for this test will be:
a. 28
b. 29
c. 58
d. 59
3. Question 3
An order effect occurs when:
a. One group is given the first treatment, and the other is subsequently given the other treatment.
b. One group is used, but the first treatment has no influence upon the second.
c. Two groups are used, and the first group is treated first and the second group treated next.
d. The same subjects are used for both groups, and the treatment given first changes performance on the treatment given

We plan to use the D score approach to test the difference between two means for a sample of 10 matched pairs. Once the D scores are computed, the procedure is identical to that for testing a hypothesis about:
a. The difference between two independent means.
b. A single mean.
c. The difference between two dependent means.
d. The procedure, although similar, is not identical to any of the above.

5. Question 5
The test between two dependent means requires that one must take special account of:
a. The correlation between the two sets of measures.
b. The standard deviation of the two variables.
c. The case of equal sample size.
d. The assumption of normality.

6. Question 6
Confidence intervals are generally to be preferred over point estimates because confidence intervals:
a. Have a firmer statistical basis.
b. Result in greater precision.
c. Account for sampling error.
d. Are based on more degrees of freedom.

7. Question 7

For a random sample of 100 cases, X¯ = 150 and sx = 35. The 95% confidence interval for µx would run approximately from:

a. 143 to 157
b. 131 to 169
c. 147 to 153
d. 138 to 162

8. Question 8
Which set of circumstances is most likely to result in a narrow confidence interval?
a. large n and a confidence level of .95
b. large n and a confidence level of .99
c. small n and a confidence level of .95
d. small n and a confidence level of .99

9. Question 9
In establishing a confidence interval for the difference between two means, selecting a confidence level of .95 rather than a confidence level of .90 implies that:
a. We can be less sure that the interval contains the true difference.
b. The interval will be wider.
c. The difference between the two sample means will be less.
d. The difference between the two population means will be greater.

10. Question 10
A confidence interval for ? is highly preferable to a point estimate when:
a. n is small.
b. n is large.
c. r is small.
d. ? is large
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