N A SAMPLE OF 60 REPUBLICANS IT WAS FOUND THEIR AVERAGE IQ TO BE 107, WITH A STANDARD DEVIATION OF 11, WHILE IN A SAMPLE OF 62 DEMOCRATS THEIR AVERAGE IQ WAS 104 AND STANDARD DEVIATION WAS 14. TEST THE CLAIM THAT REPUBLICANS HAVE HIGHER IQS THAN DEMOCRATS. USE A SIG. LEVEL OF .05.

A.

B.

C.

D.

10. Previously, an organization reported that teenagers spent 5 hours per week, on average, on the phone. The organization thinks that, currently, the mean is higher. Fifteen randomly chosen teenagers were asked how many hours per week they spend on the phone. The sample mean was 5.75 hours with a sample standard deviation of 2.8. Conduct a hypothesis test. Use a significance level of .05.

A.

B.

C.

D.

11. A company claims that more than 65 % of its employees are college graduates. In a recent sample of 145 employees, it was

found that 108 of its employees are college graduates. Is this claim accurate. Us a level of significance of .05.

A.

B.

C.

D.

12. FIND THE CORRELATION COEFFICIENT OF THE FOLLOWING DATA AND COMMENT ON ITS DIRECTION AND STRENGTH.

HIGH TEMP(X)= 55 57 59 65 70 72 80 89

CANS SOLD(Y)= 344 335 415 450 460 610 735 757

13. IF THE EQUATION ABOVE IS A GOOD FIT PREDICT THE NUMBER OF CANS SOLD WHEN THE HIGH TEMP(X) IS 77.

14. FIND THE RESIDUALS FOR TEMP(X)= 59 and 80.

X= 12 19 24 27 31 37 38 41 53

Y= 248 231 191 197 138 112 116 193 185

15. WHAT IS THE REGRESSION EQUATION OF THE ABOVE DATA, THE CORRELATION COEFFIECIENT AND THE DIRECTION AND STRENGTH OF THAT EQUATION?

16. FOR THE DATA IN #6 PREDICT THE VALUE OF Y WHEN X =S 40 AND 50.

17. A history teacher asked her students how many hours of sleep they had the night before a test. The data below shows the number of hours the student slept and their score on the exam. FIND THE CORRELATION COEFFICIENT AND THE COEFFICIENT OF DETERMINATION, (THESE TERMS SHOULD BE IN YOUR NOTES) AND COMMENT ON THE DIRECTION AND STRENGTH OF THE LINE FOR THE FOLLOWING DATA.

Hours Slept X	8	6	7	9	6	6	7	5	9
Test Score Y	81	86	77	88	79	63	94	60	86

18. FIND THE PREDICTED VALUE FOR Y WHEN X EQUALS 8. ALSO DETERMINE ITS RESIDUAL.

20. IF I REJECT Ho AND FIND OUT LATER, I WAS WRONG, WHAT TYPE OF ERROR HAVE I MADE.