1365 words - 6 pages

Data File 5

Chapter Nine

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Problem 1)

A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 1 in every one thousand. State the null hypothesis and the alternative hypothesis for a test of significance.

Problem 2)

At one school, the average amount of time that tenth-graders spend watching television each week is 18.4 hours. The principal introduces a campaign to encourage the students to watch less television. One year later, the principal wants to perform a hypothesis test to determine whether the average amount of time spent watching television per week has decreased. Formulate the null and ...view middle of the document...

0

13.0 13.0

7.0 5.0

5.0 15.0

14.0 18.0

8.0 12.0

10.0 7.0

3.0 15.0

4.0 3.0

a) Conduct a one-sample t-test. What is the t-test score? What is the mean? Was the test significant? If it was significant at what P-value level was it significant?

b) What is your null and alternative hypothesis? Given the results did you reject or fail to reject the null and why?

(Use instructions on page 349 of your textbook, under Hypothesis Tests with the t Distribution to conduct SPSS or Excel analysis).

Problem 2)

Billie wishes to test the hypothesis that overweight individuals tend to eat faster than normal-weight individuals. To test this hypothesis, she has two assistants sit in a McDonald’s restaurant and identify individuals who order the Big Mac special for lunch. The Big Mackers as they become known are then classified by the assistants as overweight, normal weight, or neither overweight nor normal weight. The assistants identify 10 overweight and 10 normal weight Big Mackers. The assistants record the amount of time it takes them to eat the Big Mac special.

1.0 585.0

1.0 540.0

1.0 660.0

1.0 571.0

1.0 584.0

1.0 653.0

1.0 574.0

1.0 569.0

1.0 619.0

1.0 535.0

2.0 697.0

2.0 782.0

2.0 587.0

2.0 675.0

2.0 635.0

2.0 672.0

2.0 606.0

2.0 789.0

2.0 806.0

2. 600.0

a) Compute an independent-samples t-test on these data. Report the t-value and the p values. Were the results significant? (Do the same thing you did for the t-test above, only this time when you go to compare means, click on independent samples t-test. When you enter group variable into grouping variable area, it will ask you to define the variables. Click define groups and place the number 1 into 1 and the number 2 into 2).

b) What is the difference between the mean of the two groups? What is the difference in the standard deviation?

c) What is the null and alternative hypothesis? Do the data results lead you to reject or fail to reject the null hypothesis?

d) What do the results tell you?

Problem 3)

Lilly collects data on a sample of 40 high school students to evaluate whether the proportion of female high school students who take advanced math courses in high school varies depending upon whether they have been raised primarily by their father or by both their mother and their father. Two variables are found below in the data file: math (0 = no advanced math and 1 = some advanced math) and Parent (1= primarily father...

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