Question

Stats Ch 10-11 Test Your Excellency__________________

1. The score on the chapter 8 test is compared with a student’s chapter 2 test. If a claim about the scores not being different is tested, -

1. Find the t test statistic.

Name	A	B	C	D	E
Ch 8	40	42	50	45	46
Ch 2	40	35	40	42	45
D	0	7	10	3	1

2. Find the margin of error:

3. Find the 95% confidence interval of the mean difference, .

2. For a 90% confidence interval between the difference of 2 proportions (home runs per at bat), the following data was found:

Team	Red Sox	Giants
x, home runs	167	154
n, at bats	3250	3455

1. What is the critical value, ?

2. What is the confidence interval?

3. Find the test-statistic.

3. Find the p-value of a test-statistics for the difference between two means, paired samples, given a test-statistic of t= 2.015, : > 0, n=19.

4. Test the claim that the proportion of the students taking Math 13 is the same as it was 10 years ago. Today: x= 40, n= 100. 10 years ago: x=50, n= 125. Let α= .05.

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Extra credit:

For a pooled estimate, find p-hat, if =12, =18, =20, =28.

Answer 1