A researcher is examining whether Omega-3 fish oil supplements improves memory functioning in patients with Alzheimer's Disease. The researcher recruits a random sample of 40 patients. Twenty patients are given an Omega-3 supplement every day for a month. The other twenty patients are given a placebo (AKA "sugar pill") every day for a month. After the month is over, all 40 participants complete a memory task. Scores on this task range from 1-20, with higher scores indicating better memory functioning. Use the data below to perform an independent groups t-test. Assume alpha = .05. Placebo Group: x-bar: 9.95 s-hat: 1.34 Omega-3 Group: x-bar: 11.70 s-hat: 0.98 S-hat pooled: 5.25 1) Is this an experimental or non-experimental study? Group of answer choices A)Experimental B) Non-Experimental 2) Is this a between- or within-subjects design? Group of answer choices A) Between-Subjects B) Within-Subjects 3) Write the null and alternative hypotheses: 4) Answer the following questions: Directional or non-directional? Alpha? Degrees of freedom? Critical value? 5) Find t observed. Hints: this is an independent groups t-test. Remember that we can not use s-hat pooled as it is, but we have to convert it to s-hatx1-x2 ? 6)Find eta2. 7)Does the Omega-3 supplement significantly improve memory functioning in Alzheimer's patients? Group of answer choices A) No B) Yes
A researcher is examining whether Omega-3 fish oil supplements improves memory
Placebo Group:
x-bar: 9.95
s-hat: 1.34
Omega-3 Group:
x-bar: 11.70
s-hat: 0.98
S-hat pooled: 5.25
1) Is this an experimental or non-experimental study?
Group of answer choices
A)Experimental
B) Non-Experimental
2) Is this a between- or within-subjects design?
Group of answer choices
A) Between-Subjects
B) Within-Subjects
3) Write the null and alternative hypotheses:
4) Answer the following questions:
Directional or non-directional?
Alpha?
Degrees of freedom?
Critical value?
5) Find t observed. Hints: this is an independent groups t-test. Remember that we can not use s-hat pooled as it is, but we have to convert it to s-hatx1-x2 ?
6)Find eta2.
7)Does the Omega-3 supplement significantly improve memory functioning in Alzheimer's patients?
Group of answer choices
A) No
B) Yes
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