Hybrid Hw #6
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Apr 3, 2024
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Hypothesis Testing and Significance- Worksheet
1.
Assume we have conducted an experiment to test the hypothesis that Medicine A affects the appetites of advanced-stage renal failure patients. For this study, we have sampled 40 advanced-stage renal failure patients and divided them into treatment and placebo groups.
a.
What is the nondirectional alternative hypothesis? -
Medicine A affects appetite b.
What is the null hypothesis? -
Medicine A does not affect appetite c.
If p <
0.05, using α
= 0.05
2 tail what do you conclude? -
There was a significance difference
d.
Which error (Type I vs Type II) may you be making by your conclusion in part c?
-
Type 1
e.
To what population does your conclusion apply? -
Population suffering from advanced renal failure 2.
You have good reason to believe that a particular gaming app is causing increased
violence in adolescents. To test this hypothesis, you conduct an experiment in which 14
individuals are randomly sampled from adolescent students attending high school X.
Each subject is run in an experimental and a control condition. In the experimental
condition, the adolescents play the game for 2 months during which you record the
number of violent acts committed. The control condition also lasts for 2 months, but the
adolescents are not allowed to play the game during this period. a.
What is the directional alternative hypothesis? -
The particular gaming app causes an increase in violence in adolescents.
b.
What is the null hypothesis? - The particular gaming app does not cause an increase in violence in adolescents. c.
If p =
0.174, using α
= 0.01
1 tail what do you conclude?
-
Since the P value is greater than the alpha value, the difference is not significant. d.
Which error (Type I vs Type II) may you be making by your conclusion in part c?
-
Type 2
e.
To what population does your conclusion apply? -
Applies to adolescents attending high school X. 3.
A workplace psychologist believes that yoga affects overall workplace productivity. To
investigate this possibility, 12 employees of the corporation are randomly selected to
participate in a yoga program. Before beginning the program, they are given a
questionnaire to measure their productivity at work. Then they begin the yoga program.
The program consists of a beginner’s yoga flow for 30 minutes a day, 4 days a week.
Each employee’s productivity is measured again after 3 months on the program. a.
What is the alternative hypothesis? Use a non-directional hypothesis.
-
Yoga affects overall workplace productivity
b.
What is the null hypothesis? -
Yoga does not affect overall workplace productivity. c.
If P =
0.02, using α
= 0.05
1 tail what do you conclude?
-
Since the P value is less than the alpha value and therefore the null hypothesis would be rejected. d.
Which error (Type I vs Type II) may you be making by your conclusion in part c?
-
Type 1 e.
To what population does your conclusion apply? -
Applies to employees working in the corporation. Adapted from: Pagano, R. R. (2001).
Understanding statistics in the behavioral sciences
. Pacific Give, CA: Brooks/Cole Publishing Company.
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