1. A researcher was interested in investigating the effectiveness of four different drugs and a placebo (sugar pill) on cholesterol levels. Twenty-five participants were randomly assigned to one of five conditions, where they received either a placebo (control) or one of the four cholesterol drugs. Two of the drugs had been on the market for several years (Drug A and Drug B), while the other two drugs were recently released (Drug C and Drug D). Conduct the appropriate test to assess whether there is an overall difference between the 5 drugs (that is, conduct the appropriate procedure that assesses, in a single test, whether there is a difference anywhere between the groups). (Testing exactly where the differences are for this problem is not required; what I want you to do is perform the appropriate overall test to assess if differences exist in general in the data). Higher scores indicate worse cholesterol. Drug A-old 163, 161, 153, 166, 174 Type of pill Drug B-old 145, 159, 171, 170, 168 Placebo 188, 179, 158, 173, 150 Drug C -new 116, 117, 132, 127, 134 Drug D-new 132, 142, 135, 156, 142 a. State the null and alternative hypotheses for the test below. b. Report the results of the hypothesis test in (a) below. Be sure to express the results in terms of the context of the study and use APA format as appropriate. (Post hoc tests are not required here - just the overall APA formatted results of the test of the null hypothesis provided in (a) above.). c What is the effect size for the study? Calculate and report the effect size below. Interpret the effect size according to Cohen's standards.
1. A researcher was interested in investigating the effectiveness of four different drugs and a placebo (sugar pill) on cholesterol levels. Twenty-five participants were randomly assigned to one of five conditions, where they received either a placebo (control) or one of the four cholesterol drugs. Two of the drugs had been on the market for several years (Drug A and Drug B), while the other two drugs were recently released (Drug C and Drug D). Conduct the appropriate test to assess whether there is an overall difference between the 5 drugs (that is, conduct the appropriate procedure that assesses, in a single test, whether there is a difference anywhere between the groups). (Testing exactly where the differences are for this problem is not required; what I want you to do is perform the appropriate overall test to assess if differences exist in general in the data). Higher scores indicate worse cholesterol. Drug A-old 163, 161, 153, 166, 174 Type of pill Drug B-old 145, 159, 171, 170, 168 Placebo 188, 179, 158, 173, 150 Drug C -new 116, 117, 132, 127, 134 Drug D-new 132, 142, 135, 156, 142 a. State the null and alternative hypotheses for the test below. b. Report the results of the hypothesis test in (a) below. Be sure to express the results in terms of the context of the study and use APA format as appropriate. (Post hoc tests are not required here - just the overall APA formatted results of the test of the null hypothesis provided in (a) above.). c What is the effect size for the study? Calculate and report the effect size below. Interpret the effect size according to Cohen's standards.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:1. A researcher was interested in investigating the effectiveness of four different drugs and a
placebo (sugar pill) on cholesterol levels. Twenty-five participants were randomly assigned to
one of five conditions, where they received either a placebo (control) or one of the four
cholesterol drugs. Two of the drugs had been on the market for several years (Drug A and Drug
B), while the other two drugs were recently released (Drug C and Drug D). Conduct the
appropriate test to assess whether there is an overall difference between the 5 drugs (that is,
conduct the appropriate procedure that assesses, in a single test, whether there is a difference
anywhere between the groups). (Testing exactly where the differences are for this problem is not
required; what I want you to do is perform the appropriate overall test to assess if differences
exist in general in the data). Higher scores indicate worse cholesterol.
Drug A-old
163, 161, 153,
166, 174
Type of pill
Drug B-old
145, 159, 171,
170, 168
Placebo
188, 179, 158,
173, 150
Drug C -new
116, 117, 132,
127, 134
Drug D-new
132, 142, 135,
156, 142
a. State the null and alternative hypotheses for the test below.
b. Report the results of the hypothesis test in (a) below. Be sure to express the results in terms of
the context of the study and use APA format as appropriate. (Post hoc tests are not required here
- just the overall APA formatted results of the test of the null hypothesis provided in (a) above.).
c What is the effect size for the study? Calculate and report the effect size below. Interpret the
effect size according to Cohen's standards.
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