Retention Test Scores A sample of non-English majors at a selected college was used in a study to see if the student retained more from reading a

19.

^o-century novel or by watching it in DVD form. Each student was assigned one novel to read and a different one to watch, and then they were given a

100

-point written quiz on each novel. Assume the variables are normally distributed. The test results are shown below.

Book	88	73	91	85	93	95	90	90	80	90
DVD	80	95	95	92	93	80	92	75	70	80

At =0.05, can it be concluded that the book scores are higher than the DVD scores?

(A) STATE THE HYPOTHESES AND IDENTIFY THE CLAIM. STATE THE HYPOTHESIS TEST

(B) FIND THE CRITICAL AND TEST VALUE

(C) WHAT IS THE P-VALUE?

(D) MAKE THE DECISION

Professional Golfers' Earnings Two random samples of earnings of professional golfers were selected. One sample was taken from the Professional Golfers Association, and the other was taken from the Ladies Professional Golfers Association. At =0.10, is there a difference in the means? The data are in thousands of dlares. Use the P-value method with tables.

PGA
446	1147	1344	9188	5687
4910	8553	7573	375
LPGA
48	76	122	466	863
100	2029	4364	2921

Use 1 for the mean earnings of PGA golfers. Assume the variables are normally distributed and the variances are unequal.

(A) STATE THE HYPOTHESES AND IDENTIFY THE CLAIM. STATE THE HYPOTHESIS TEST

(B) FIND THE CRITICAL AND TEST VALUE

(C) WHAT IS THE P-VALUE?

(D) MAKE THE DECISION

Waterfall Heights Is there a significant difference at =0.10 in the mean heights in feet of waterfalls in Europe and the ones in Asia? The data are shown. Use the critical value method with tables.

Europe	Asia
487	1312		614	320
900	1385		350	830
1246			722

Use 1 for the mean height of waterfalls in Europe. Assume the variables are normally distributed and the variances are unequal.

(A) STATE THE HYPOTHESES AND IDENTIFY THE CLAIM. STATE THE HYPOTHESIS TEST

(B) FIND THE CRITICAL AND TEST VALUE

(C) WHAT IS THE P-VALUE?

(D) MAKE THE DECISION