Work sheet #5 STA 2023

For each hypothesis test, tell H_o, H_a, critical value (from the table), calculated value (round to the same number of places as the critical value), decision (reject H_o or Fail to reject H_o), and if there is significant linear correlation. DRAW EACH!!

1) Test for linear correlation with a = .01

1 3 3 5

6 8 8 10

2) a) Give the equation of the regression line for #1.

b) Predict when

3) Test for linear correlation with a = .05

1 2 3 5 5

19 12 4 20 18

4) a) Give the equation of the regression line for #3. (values to the nearest tenth).

b) Predict when

5) Test for linear correlation with a = .05 for these supermodels.

Height (in.) 71 70.5 71 72 70 70 66.5 70 71

Weight (lb.) 125 119 128 128 119 127 105 123 115

6) a) Give the equation of the regression line for #5.(values to nearest tenth)

b) Predict weight when height is 68 in.

7) Test for linear correlation with a = .01 for discarded plastic

Plastic (lb.) 0.27 1.41 2.19 2.83 2.19 1.81 0.85 3.05

Household size 2 3 3 6 4 2 1 5

8) a) Give the equation of the regression line for #7.(values to nearest thousandth).

b) Predict household size when plastic discarded is 2 lb.(to whole #)

9) Test for linear correlation with a = .05 for age and blood alcohol content at time of arrest for DUI.

Age 17.2 43.5 30.7 53.1 37.2 21.0 27.6 46.3 22.4 29.1

BAC 0.19 0.20 0.26 0.16 0.24 0.20 0.18 0.23 0.14 0.18

10) a) Give the equation of the regression line for #9.(values to nearest thousandth).

b) Predict blood alcohol content for age 34.