1) Exhibit 13-4 In a completely randomized experimental design involving five treatments, 13 observations were recorded for each of the five treatments. The following information is provided. SSTR = 200 (Sum Square Between Treatments) SST = 800 (Total Sum Square) If at a 5% level of significance we want to determine whether or not the means of the five populations are equal, the critical value of F is _____.

a. 2.53

b. 4.98

c. 39.48

d. 19.48

2) Exhibit 14-3 Regression analysis was applied between sales data (in $1000s) and advertising data (in $100s), and the following information was obtained.

= 12 + 1.8x

n = 17

SSR = 225

SSE = 75

S_b1 = 0.2683

Refer to Exhibit 14-3. Using = .05, the critical t value for testing the significance of the slope is _____.

a. 1.753

b. 1.746

c. 2.131

d. 2.120

3) Exhibit 15-6 Below you are given a partial Excel output based on a sample of 16 observations.

ANOVA
	df		SS	MS	F
Regression			4,853		2,426.5
Residual					485.3

	Coefficients	Standard Error
Intercept	12.924		4.425
x1	-3.682		2.630
x2	45.216		12.560

The F value obtained from the table used to test if there is a relationship among the variables at the 5% level equals _____.

a. 3.63

b. 19.41

c. 3.81

d. 3.41

4) In a completely randomized experimental design involving six treatments, 11 observations were recorded for each of the six treatments. The following information is provided. SSTR = 400 (Sum Square Between Treatments) SST = 700 (Total Sum Square) The mean square within treatments (MSE) is _____.

a. 400

b. 80

c. 300

d. 5

5) The management of a department store is interested in estimating the difference between the mean credit purchases of customers using the store's credit card versus those customers using a national major credit card. You are given the following information. Assume the samples were selected randomly.

	Store's Card	Major Credit Card
Sample size	64	49
Sample mean	$130	$115
Population standard deviation	$15	$9

A 95% confidence interval estimate for the difference (Store's Card - Major Credit Card) between the average purchases of the customers using the two different credit cards is _____.

a. $10.54 to $19.46

b. $115 to $130

c. $49 to $64

d. $9 to $15

6)

	Sample A	Sample B
s2	22	25
n	10	8

We want to test the hypothesis that population B has a smaller variance than population A. The null hypothesis is to be tested at the 5% level of significance. The critical value from the table is _____.

a. 3.07

b. 3.35

c. 3.29

d. 3.68

7)

Sample A	Sample B
s 2	32	38
n	24	16

We want to test the hypothesis that the population variances are equal.

The null hypothesis is to be tested at the 10% level of significance. The critical value from the table is _____.

a. 2.11

b. 2.13

c. 2.24

d. 2.29