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Introduction To Probability And Statistics

PSY-380 Introduction to Probability and Statistics

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Answer each question completely, showing all your work. Copy and Paste the SPSS output into the word document for the calculations portion of the problems. (Please remember to answer the questions you must interpret the SPSS output).

1.      A researcher is interested to learn if there is a linear relationship between the hours in a week spent exercising and a person’s life satisfaction. The researchers collected the following data from a random sample, which included the number of hours spent exercising in a week and a ranking of life satisfaction from 1 to 10 ( 1 being the lowest and 10 the highest).

Participant Hours of Exercise Life Satisfaction
1 3 1
2 14 2
3 14 4
4 14 4
5 3 10
6 5 5
7 10 3
8 11 4
9 8 8
10 7 4
11 6 9
12 11 5
13 6 4
14 11 10
15 8 4
16 15 7
17 8 4
18 8 5
19 10 4
20 5 4

a.       Find the mean hours of exercise per week by the participants.

b.      Find the variance of the hours of exercise per week by the participants.

c.       Determine if there is a linear relationship between the hours of exercise per week and the life satisfaction by using the correlation coefficient.

d.      Describe the amount of variation in the life satisfaction ranking that is due to the relationship between the hours of exercise per week and the life satisfaction.

e.       Develop a model of the linear relationship using the regression line formula.

2.      Insomnia has become an epidemic in the United States. Much research has been done in the development of new pharmaceuticals to aide those who suffer from insomnia. Alternatives to the pharmaceuticals are being sought by sufferers. A new relaxation technique has been tested to see if it is effective in treating the disorder. Sixty insomnia sufferers between the ages of 18 to 40 with no underlying health conditions volunteered to participate in a clinical trial. They were randomly assigned to either receive the relaxation treatment or a proven pharmaceutical treatment. Thirty were assigned to each group. The amount of time it took each of them to fall asleep was measured and recorded. The data is shown below. Use the appropriate t-test to determine if the relaxation treatment is more effective than the pharmaceutical treatment at a level of significance of 0.05.

Relaxation Pharmaceutical
98 20
117 35
51 130
28 83
65 157
107 138
88 49
90 142
105 157
73 39
44 46
53 194
20 94
50 95
92 161
112 154
71 75
96 57
86 34
92 118
75 41
41 145
102 148
24 117
96 177
108 119
102 186
35 22
46 61
74 75

3.      A researcher is interested to learn if there is a relationship between the level of interaction a women in her 20s has with her mother and her life satisfaction ranking. Below is a list of women who fit into each of four level of interaction. Conduct a One-Way ANOVA on the data to determine if a relationship exists.

No Interaction Low Interaction Moderate Interaction High Interaction
2 3 3 9
4 3 10 10
4 5 2 8
4 1 1 5
7 2 2 8
8 2 3 4
1 7 10 9
1 8 8 4
8 6 4 1
4 5 3 8

4.      Is there a relationship between handedness and gender? A researcher collected the following data in hopes of discovering if handedness and gender are independent (Ambidextrous individuals were excluded from the study). Use the Chi-Square test for independence to explore this at a level of significance of 0.05.

  Left-Handed Right-Handed
Men 13 22
Women 27 18

5.      A researcher is interested in studying the effect that the amount of fat in the diet and amount of exercise has on the mental acuity of middle-aged women. The researcher used three different treatment levels for the diet and two levels for the exercise. The results of the acuity test for the subjects in the different treatment levels are shown below.

Exercise <30% fat 30% – 60% fat >60% fat
<60 minutes 4 3 2
  4 1 2
  2 2 2
  4 2 2
  3 3 1
60 minutes 6 8 5
or more 5 8 7
  4 7 5
  4 8 5
  5 6 6

a.       Perform a two-way analysis of variance and explain the results. (Show all work to receive full credit)

b.      Find the effect size for each factor and the interaction and explain the results. (Show all work to receive full credit)

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