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# Confidence Interval - Hypothesis Testing - Regression

From a production line A, a sample of 200 items is selected at random; and it is determined that 16 items are defective. While in a sample of 300 items from production process B (which produces identical items to line A) there are 21 defective items. Determine a 95% confidence interval estimate for the difference between the proportions of defectives in the two lines

Consider the following results for independent samples taken from two populations.
Sample 1 Sample 2
n1 = 400 n2= 300
p1 = .48 p2 = .36
Determine the point estimate of the difference between the two population proportions

Consider the following results for independent samples taken from two populations.
Sample 1 Sample 2
n1 = 400 n2= 300
p1 = .48 p2 = .36
Develop a 90% confidence interval for the difference between the two population proportions.

Predict the value of y when x = 6 if y = 30 + 2x

The following data were collected on the height and weight of women swimmers.
Height 68 64 62 65 66
Weight 132 108 102 115 128
Develop a scatter diagram for these data with height as the independent variable (do no include) What does the scatter diagram developed indicate about the relationship between the two variables?

The following data were collected on the height and weight of women swimmers.
Height 68 64 62 65 66
Weight 132 108 102 115 128
Compute b1

In a simple linear regression, calculate the SSR given that the SSE = 5 and the SST = 245

Compute the coefficient of determination, r2 given that SST = 240 and SSR = 30

Compute the sample correlation coefficient, r given that SST = 240 and SSR = 30

In a Multiple Linear Regression, estimate y when x1 = 200 and x2 = 100 and y = 10 + .50x1 + /.20x2

Compute Ra2 given R2 = .92 and n = 10, p = 2

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