Group Quiz ScoreCaffeine 9Caffeine 10Caffeine 9Caffeine 8Placebo 7Placebo 6Placebo 4Placebo 8Placebo 5 Ana is a Cognitive Psychologist and coffee lover.She decides to conduct a study investigating theimpact of coffee on quiz comprehension. Sherandomly assigns participants to either the coffeegroup or the placebo group. Thirty minutes beforethe study begins, participants are given either acup of coffee to drink (the caffeine group) or acup of decaffeinated coffee to drink (the placebogroup/no caffeine group) while they sit in thewaiting room. Participants are not told whetherthey are drinking regular coffee or decaffeinatedcoffee. Following the thirty minutes, participantsenter the lab and are asked to read a passage oftext. After a short delay, participants are given aquiz to complete where they answer a series of 10questions about the passage they read earlier. Anais measuring the number of correct answers onthe quiz. Unfortunately, one participant did notshow up, so Ana was left with unequal samplesizes: Five participants in the placebo group and 4participants in the caffeine group. Ana isinterested in determining ifis a difference inthe number of quiz questions correctly answeredin the caffeine group relative to the placebogroup.Use the data file, Caffeine.csv as needed toanswer the following:d. With specific reference to the researchscenario described above, explain how thecalculation of pooled variance will beinfluenced by the sample sizes in this study.No calculations are required to answer thisquestion.e. Calculate (by hand) and interpret Cohen's dmeasure of effect size in this study. Thecalculations you computed by hand need tobe clearly displayed along with aninterpretation of effect size.f. Calculate (by hand) and report theconfidence interval. Please be sure to showyour calculations. Note, you will need toconsult the t-distribution table to identify the tcritical value.g. Does the confidence interval you computedin question f) imply a statistically significantresult? Explain.

The sample size of caffeine group is lower than that of placebo group in the study. Therefore, the…

Use the data file, Caffeine.csv as needed to answer the following: d. With specific reference to the research scenario described above, explain how the calculation of pooled variance will be influenced by the sample sizes in this study. No calculations are required to answer this question. e. Calculate (by hand) and interpret Cohen's d measure of effect size in this study. The calculations you computed by hand need to be clearly displayed along with an interpretation of effect size. f. Calculate (by hand) and report the confidence interval. Please be sure to show your calculations. Note, you will need to consult the t-distribution table to identify the t critical value. g. Does the confidence interval you computed in question f) imply a statistically significant result? Explain.