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a. Conduct an independent-samples t-test by hand, showing how you calculated the t statistic. Please show work and calculations for each step b. Run this independent-samples t-test in jamovi, to verify that you correctly calculated the t-test statistic in a). Include a screenshot of the main analysis table from jamovi as your answer to this question. c. Looking at your main analysis table from jamovi you included in question b), make a decision about the null hypothesis using a = .05. Why did you make this decision? you are using the p-value approach and jamovi to arrive at your decision, not the critical value approach.

a. Conduct an independent-samples t-test by hand, showing how you calculated the t statistic. Please show work and calculations for each step b. Run this independent-samples t-test in jamovi, to verify that you correctly calculated the t-test statistic in a). Include a screenshot of the main analysis table from jamovi as your answer to this question. c. Looking at your main analysis table from jamovi you included in question b), make a decision about the null hypothesis using a = .05. Why did you make this decision? you are using the p-value approach and jamovi to arrive at your decision, not the critical value approach.

MATLAB: An Introduction with Applications
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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Ana is a Cognitive Psychologist and coffee lover. She decides to conduct a study investigating the impact of coffee on quiz comprehension. She randomly assigns participants to either the coffee group or the placebo group. Thirty minutes before the study begins, participants are given either a cup of coffee to drink (the caffeine group) or a cup of decaffeinated coffee to drink (the placebo group/no caffeine group) while they sit in the waiting room. Participants are not told whether they are drinking regular coffee or decaffeinated coffee. Following the thirty minutes, participants enter the lab and are asked to read a passage of text. After a short delay, participants are given a quiz to complete where they answer a series of 10 questions about the passage they read earlier. Ana is measuring the number of correct answers on the quiz. Unfortunately, one participant did not show up, so Ana was left with unequal sample sizes: Five participants in the placebo group and 4 participants in the caffeine group. Ana is interested in determining if there is a difference in the number of quiz questions correctly answered in the caffeine group relative to the placebo group. Use the data file, Caffeine.csv as needed to answer the following: a. Conduct an independent-samples t-test by hand, showing how you calculated the t statistic. Please show work and calculations for each step b. Run this independent-samples t-test in jamovi, to verify that you correctly calculated the t-test statistic in a). Include a screenshot of the main analysis table from jamovi as your answer to this question. c. Looking at your main analysis table from jamovi you included in question b), make a decision about the null hypothesis using a .05. Why did you make this decision? you are using the p-value approach and jamovi to arrive at your decision, not the critical value approach.
Transcribed Image Text:Ana is a Cognitive Psychologist and coffee lover. She decides to conduct a study investigating the impact of coffee on quiz comprehension. She randomly assigns participants to either the coffee group or the placebo group. Thirty minutes before the study begins, participants are given either a cup of coffee to drink (the caffeine group) or a cup of decaffeinated coffee to drink (the placebo group/no caffeine group) while they sit in the waiting room. Participants are not told whether they are drinking regular coffee or decaffeinated coffee. Following the thirty minutes, participants enter the lab and are asked to read a passage of text. After a short delay, participants are given a quiz to complete where they answer a series of 10 questions about the passage they read earlier. Ana is measuring the number of correct answers on the quiz. Unfortunately, one participant did not show up, so Ana was left with unequal sample sizes: Five participants in the placebo group and 4 participants in the caffeine group. Ana is interested in determining if there is a difference in the number of quiz questions correctly answered in the caffeine group relative to the placebo group. Use the data file, Caffeine.csv as needed to answer the following: a. Conduct an independent-samples t-test by hand, showing how you calculated the t statistic. Please show work and calculations for each step b. Run this independent-samples t-test in jamovi, to verify that you correctly calculated the t-test statistic in a). Include a screenshot of the main analysis table from jamovi as your answer to this question. c. Looking at your main analysis table from jamovi you included in question b), make a decision about the null hypothesis using a .05. Why did you make this decision? you are using the p-value approach and jamovi to arrive at your decision, not the critical value approach.
Group Quiz Score Caffeine 9 Caffeine 10 Caffeine 9 Caffeine 8 Placebo 7 Placebo 6 Placebo 4 Placebo 8 Placebo 5
Transcribed Image Text:Group Quiz Score Caffeine 9 Caffeine 10 Caffeine 9 Caffeine 8 Placebo 7 Placebo 6 Placebo 4 Placebo 8 Placebo 5
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