1- Please help me choose the correct answer:

Exhibit 16-2 In a regression model involving 30 observations, the following estimated regression equation was obtained. = 170 + 34x₁ - 3x₂ + 8x₃ + 58x₄ + 3x₅ For this model, SSR = 1,740 and SST = 2,000. The degrees of freedom associated with SSR are _____.

a. 19

b. 5

c. 24

d. 6

2-

Exhibit 14-6 You are given the following information about x and y.

x Independent Variable	y Dependent Variable
4	12
6	3
2	7
4	6

Refer to Exhibit 14-6. The least squares estimate of b₀ equals _____.

a. -11

b. 1

c. 11

d. -1

3-

The results of a recent poll on the preference of shoppers regarding two products are shown below.

Product	Shoppers Surveyed	Shoppers Favoring This Product
A	700	490
B	800	496

The standard error of p₁ - p₂ is _____.

a. 0.0244

b. 100

c. 6

d. 0.283

4-

The manager of the service department of a local car dealership has noted that the service times of a sample of 14 new automobiles has a standard deviation of 4 minutes. A 95% confidence interval estimate for the variance of service times for all its new automobiles is _____.

a. 8.41 to 41.53

b. 1.05 to 5.19

c. 4 to 16

d. 2.10 to 10.38

5-

The following information was obtained from matched samples.

Individual	Method 1	Method 2
1	9	6
2	4	7
3	8	6
4	5	8
5	4	8

The 95% confidence interval for the mean of the population of differences (Method 1 - Method 2) is _____.

a. -5.498 to 3.498

b. -4.089 to 2.089

c. 0 to 5.023

d. -5.023 to 3.023