week 8 stat discussion board

Part A

 

As for the Week 8 discussion, please write your advice of at least 100 words for the future Statistics200 students – telling them what you have done well and what you wish that you had done more in this class, and why your advice is important for them to succeed in this course.

 

 

Part B. Show all your workings please. You are to choose the best three you know and can do very well. Please show workings and explained in full details

 

  1. If an experiment is conducted with 5 conditions and 6 subjects in each condition, what are dfn and dfe?
  2. How is the mean square computed from the sum of squares?

 

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 following

724 CHAPTER 13 | F DISTRIBUTION AND ONE-WAY ANOVA

data 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 = ________ ________ ________ ________ ________

Table 13.20

H0: μ1 = μ2 = μ3 = μ4 = μ5
Hα: At least any two of the group means μ1, μ2, …, μ5 are not equal.

  1. F statistic = ________

 

  1. 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.

  1. 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.