**Does Caffeine Improve Exam Performance?**Suppose all students in the 8:30 section of a course are given a "treatment" (two cups of coffee) and all students in the 9:30 section are not permitted to have any caffeine before a mid-term exam.Instead of the original plan, students in both sections are randomly assigned to a group receiving two cups of caffeinated coffee, a group receiving two cups of decaffeinated coffee, or a group receiving no beverage at all. The coffee is so bad that students cannot tell whether they are enjoying caffeine or decaf, but as it turns out, both groups receiving coffee did better on the exam than students in the group who were not given anything.This could be the result of:- ○ an observational study.- ○ the placebo effect.- ○ voluntary response.- ○ sampling variability.

A placebo is a kind of pseudo treatment that is given to a group of sample points in place of the…

Answered: Does caffeine improve exam performance?…

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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Classify the experiments according to their experimental designs. Some designs may be used more than once.
Do d, e and f part of the question thank you
A researcher studies the effects of guilt on memory. First, subjects perform a very boring task for one hour. Then each subject is instructed to tell the next subject either (a) that the experiment took one hour and they found it very boring, or (b) that the experiment took one hour and was very interesting. After that, each subject is asked to study a list of words and are tested on memory for the list. 30 subjects are randomly assigned to one of the two conditions. In order to see whether the experimental manipulation has any effect on memory, which would be the proper statistical test? A)a related sample t-test-test   B)an independent sample t-test   C)a z test   D)a one sample t
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