Statistics

Lane: Chapter 15:

10. If an experiment is conducted with 5 conditions and 6 subjects in each

Condition, what are dfn and dfe?

17. The following data are from a hypothetical study on the effects of age and time on scores on a test of reading comprehension. Compute the analysis of variance summary table.

12 – Years olds 16- Years olds

66 74

68 71

59 67

30 Minutes 72 82

46 76

69 95

61 92

69 95

60 Minutes73 98

61 94

ADHD Treatment (AT) case study

28. (AT) The dataset ADHD Treatment has four scores per subject. a. Is the designbetween-subjects or within-subjects? b. Create an ANOVA summary table.

29. (AT) Using the Anger Expression Index from the Angry Moods study as the dependent variable, perform a 2×2 ANOVA with gender and sportsparticipation as the two factors. Do athletes and non-athletes differ significantly in how much anger they express? Do the genders differ significantly in AngerExpression Index? Is the effect of sports participation significantly different forthe two genders?

Illowsky: Chapter 13.

13.2 The F Distribution and the F-Ratio

Use the following information to answer the next three exercises. Suppose a group is interested in determining whether teenagers obtain their drivers licenses at approximately the same average age across the country. Suppose that the followingdata are randomly collected from five teenagers in each region of the country. The numbers represent the age at which

teenagers obtained their drivers licenses.

Northeast South West Central East

16.3 16.9 16.4 16.2 17.1

16.1 16.5 16.5 16.6 17.2

16.4 16.4 16.6 16.5 16.6

16.5 16.2 16.1 16.4 16.8

x ¯= ________ ________ ________ ________________

s2 =________ ________ ________ ________ ________

H0: µ1 = µ2 = µ3 = µ4 = µ5

Ha: At least any two of the group means µ1, µ2, …, µ5 are not equal.

61. degrees of freedom – numerator: df(num) = _________

62. degrees of freedom – denominator: df(denom) = ________

63. F statistic = ________

69. A researcher wants to know if the mean times (in minutes) that people watch their favorite news station are the same.Suppose that Table 13.24 shows the results of a study.

CNN FOX Local

45 15 72

12 43 37

18 68 56

38 50 60

23 31 51

35 22

Table 13.24

Assume that all distributions are normal, the four population standard deviations are approximately the same, and the data were collected independently and randomly. Use a level of significance of 0.05.

71. Are the mean number of times a month a person eats out the same for whites, blacks, Hispanics and Asians? Suppose that Table 13.26 shows the results of a study.

White Black Hispanic Asian

6 4 7 8

8 1 3 3

2 5 5 5

4 2 4 1

6 6 7

Table 13.26

Assume that all distributions are normal, the four population standard deviations are approximately the same, and the data were collected independently and randomly. Use a level of significance of 0.05.

77. A grassroots group opposed to a proposed increase in the gas tax claimed that the increase would hurt working-class people the most, since they commute the farthest to work. Suppose that the group randomly surveyed 24 individuals and asked them their daily one-way commuting mileage. The results are as follows.

Table 13.32

Working-classprofessional (middle incomes) professional (wealthy)

17.8 16.5 8.5

26.7 17.4 6.3

49.4 22.0 4.6

9.47.4 12.6

65.4 9.4 11.0

47.1 2.1 28.6

19.5 6.4 15.4

51.2 13.9 9.3

Determine whether or not the variance in mileage driven is statistically the same among the working class and professional(middle income) groups. Use a 5% significance level.

81. Is the variance for the amount of money, in dollars, that shoppers spend on Saturdays at the mall the same as the variance for the amount of money that shoppers spend on Sundays at the mall? Suppose that the Table 13.34 shows the results of a study.

Saturday Sunday Saturday Sunday

75 44 62 137

18 58 0 82

15061 124 39

94 19 50 127

62 99 31 141

73 60 11873

89

PLACE THIS ORDER OR A SIMILAR ORDER WITH US TODAY AND GET A GOOD DISCOUNT 🙂

Basic features

- Free title page and bibliography
- Unlimited revisions
- Plagiarism-free guarantee
- Money-back guarantee
- 24/7 support

On-demand options

- Writer’s samples
- Part-by-part delivery
- Overnight delivery
- Copies of used sources
- Expert Proofreading

Paper format

- 275 words per page
- 12 pt Arial/Times New Roman
- Double line spacing
- Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Delivering a high-quality product at a reasonable price is not enough anymore.

That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

Read moreEach paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

Read moreThanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.

Read moreYour email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.

Read moreBy sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.

Read more
The price is based on these factors:

Academic level

Number of pages

Urgency