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 Type of pill Drug B- old 145, 159, 171, 170, 168 Drug D 132, 142, 135 156, 142 Drug A-old 163, 161, 153, 166, 174 Drug C-new 116, 117, 132 127, 134 Placebo -new 188, 179, 158 173, 150 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 2. Using the data provided in # 1 , conduct the following contrasts in SPSS. The researcher was interested in examining whether there was a significant difference between (a) the placebo vs. the drug conditions (include all drugs here), (b) the old drugs vs. the new drugs, and (c) the new drugs (Drug C vs. Drug D). Use a .05 for the set of 3 contrasts. a. State the null and alternative hypotheses for each of the contrasts below. Label the hypotheses as appropriate, so that I know which hypotheses go with which contrasts. (For example, write 'contrast 1,' and then provide the hypotheses for the first contrast, etc.) b. Provide the weights for each of the contrasts below. (For example, write 'contrast 1' and then provide the weights for that contrast, etc.). c. What value of alpha should each contrast be conducted at? Report the value of alpha below (show how you obtained this value -ie., show your work) d. Write the results of each of the contrast tests in APA format below.

Question

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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
Type of pill
Drug B- old
145, 159, 171,
170, 168
Drug D
132, 142, 135
156, 142
Drug A-old
163, 161, 153,
166, 174
Drug C-new
116, 117, 132
127, 134
Placebo
-new
188, 179, 158
173, 150
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
2. Using the data provided in # 1 , conduct the following contrasts in SPSS. The researcher was
interested in examining whether there was a significant difference between (a) the placebo vs.
the drug conditions (include all drugs here), (b) the old drugs vs. the new drugs, and (c) the new
drugs (Drug C vs. Drug D). Use a .05 for the set of 3 contrasts.
a. State the null and alternative hypotheses for each of the contrasts below. Label the
hypotheses as appropriate, so that I know which hypotheses go with which contrasts. (For
example, write 'contrast 1,' and then provide the hypotheses for the first contrast, etc.)
b. Provide the weights for each of the contrasts below. (For example, write 'contrast 1' and then
provide the weights for that contrast, etc.).
c. What value of alpha should each contrast be conducted at? Report the value of alpha below
(show how you obtained this value -ie., show your work)
d.
Write the results of each of the contrast tests in APA format below.

Image Transcription

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 Type of pill Drug B- old 145, 159, 171, 170, 168 Drug D 132, 142, 135 156, 142 Drug A-old 163, 161, 153, 166, 174 Drug C-new 116, 117, 132 127, 134 Placebo -new 188, 179, 158 173, 150 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 2. Using the data provided in # 1 , conduct the following contrasts in SPSS. The researcher was interested in examining whether there was a significant difference between (a) the placebo vs. the drug conditions (include all drugs here), (b) the old drugs vs. the new drugs, and (c) the new drugs (Drug C vs. Drug D). Use a .05 for the set of 3 contrasts. a. State the null and alternative hypotheses for each of the contrasts below. Label the hypotheses as appropriate, so that I know which hypotheses go with which contrasts. (For example, write 'contrast 1,' and then provide the hypotheses for the first contrast, etc.) b. Provide the weights for each of the contrasts below. (For example, write 'contrast 1' and then provide the weights for that contrast, etc.). c. What value of alpha should each contrast be conducted at? Report the value of alpha below (show how you obtained this value -ie., show your work) d. Write the results of each of the contrast tests in APA format below.

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