1.A hypothesis regarding the weight of newborn infants at a community hospital is that the mean is 19.1 pounds. A sample of seven infants is randomly selected and their weights at birth are recorded as 18.1, 21.1, 22.1, 23.1, 21.1, 27.1, and 27.1 pounds. What are the degrees of freedom?

		19.1
		7
		26.7
		6

2.A national manufacturer of ball bearings is experimenting with two different processes for producing precision ball bearings. It is important that the diameters be as close as possible to an industry standard. The output from each process is sampled, and the average error from the industry standard is measured in millimeters. The results are presented here.

	Process A	Process B
Sample mean	2.0	3.0
Standard deviation	1.0	0.5
Sample size	12	14

The researcher is interested in determining whether there is evidence that the two processes yield different average errors. The population standard deviations are unknown but are assumed equal. What is the null hypothesis?

		H0: A > B
		H0: A B
		H0: A B
		H0: A = B

3. Assuming the population variances are known, the variance of thedistribution of differences between twoindependent population means is ________.

		the sum of the two sample sizes for each population
		the sum of the two variances of the two sampling distributions
		the sum of the two means
		the sum of the two standarddeviations of the two sampling distributions

4.Consider a two-tailed test with a level of confidence of 81.70%. The z-value is _______.

		2.00
		0.89
		2.66
		1.33

5. For a null hypothesis, H₀: = 4,000, if the 1% level of significance is used and the z-test statistic is +6.00, what is our decision regarding the null hypothesis?

		Reject H1.
		Reject H0.
		Do not reject H0.
		None of these answers apply.

6. Given the following ANOVA table for three treatments each with six observations:

Source	Sum of Squares	df	Mean square
Treatment	1,116
Error	1,068
Total	2,184

What is the treatment mean square?

		534
		558
		71.2
		71.4

7. Given the following ANOVA table for three treatments each with six observations:

Source	Sum of Squares	df	Mean square
Treatment	1,116
Error	1,068
Total	2,184

What is the computed value of F?

		7.48
		8.84
		7.84
		8.48

8. If the alternate hypothesis states that 4,000, where is the rejection region for the hypothesis test?

		In both tails
		In the lower or left tail
		In the center
		In the upper or right tail

9.i f the null hypothesis that two means are equal is true, where will 97% of the computed z-values lie between?

		2.17
		2.33
		2.07
		2.58

10. In an ANOVA problem involving three treatments and 19 observations per treatment, SSE = 648. The MSE for this scenario is _______.

		12
		54
		29.5
		216