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Chapter 10: Q.74 (page 600)

Use the following information to answer the next five exercises. A doctor wants to know if a blood pressure medication is

effective. Six subjects have their blood pressures recorded. After twelve weeks on the medication, the same six subjects

have their blood pressure recorded again. For this test, only systolic pressure is of concern. Test at the 1% significance level.

What is the test statistic?

Short Answer

Expert verified

The test statistic is-1.754

Step by step solution

01

Given information

The table is

02

State the test statistic 

First, press STAT and 鈫�to discover test static.

Now, TESTS must be selected twice.

To enter the stat list editor, press STAT then 1.

Next, enter the list for the before and after values, then go ahead to the third list and enter L2-L1in the name list. also press ENTER after each value. The information is:

Once completed all of the sample entries, hit ENTER to get the below results:

Thus, the test statistic is -1.754.

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Most popular questions from this chapter

Use the following information to answer the next five exercises. A study was conducted to test the effectiveness of a software patch in reducing system failures over a six-month period. Results for randomly selected installations are shown in Table 10.21. The 鈥渂efore鈥� value is matched to an 鈥渁fter鈥� value, and the differences are calculated. The differences have a normal distribution. Test at the 1% significance level.

State the null and alternative hypotheses.

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Use the following information to answer the next 12 exercises: The U.S. Center for Disease Control reports that the mean life expectancy was 47.6 years for whites born in 1900 and 33.0 years for nonwhites. Suppose that you randomly survey death records for people born in 1900 in a certain county. Of the 124 whites, the mean life span was 45.3 years with a standard deviation of 12.7 years. Of the 82 nonwhites, the mean life span was 34.1 years with a standard deviation of 15.6 years. Conduct a hypothesis test to see if the mean life spans in the county were the same for whites and nonwhites.

Calculate the test statistic and p-value.
See all solutions

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