Pretend you have the following data for 16 subjects in a study designed to determine whether strong coffee speeds neural processing, in this case defined as reaction time in a simple memory task, with lower numbers reflecting faster processing. The 16 subjects were randomly assigned to two groups: placebo control group vs. coffee experimental group. Here are the results, followed by guidance for the VassarStats program: Placebo Coffee 28 26 23 18 20 15 28 24 29 24 33 19 34 13 http://vassarstats.net/ #1. What is the null hypothesis for this study? #2. a. State the mean for each group: Placebo mean = ?? Coffee mean = ?? b. What is the mean difference? #3. a. What was the level of significance (two-tailed p value)? b. What, then, is the probability that “chance” explained this mean difference given that p value? #4. a. What is your decision regarding the null hypothesis given the p value? Accept or reject? b. Are the results “significant” or “not significant?” #5. What is your overall conclusion given your statistical findings?
Pretend you have the following data for 16 subjects in a study designed to determine whether strong coffee speeds neural processing, in this case defined as reaction time in a simple memory task, with lower numbers reflecting faster processing. The 16 subjects were randomly assigned to two groups: placebo control group vs. coffee experimental group.
Here are the results, followed by guidance for the VassarStats program:
Placebo Coffee
28 26
23 18
20 15
28 24
29 24
33 19
34 13
http://vassarstats.net/
#1. What is the null hypothesis for this study?
#2.
a. State the mean for each group: Placebo mean = ?? Coffee mean = ??
b. What is the mean difference?
#3.
a. What was the level of significance (two-tailed p value)?
b. What, then, is the probability that “chance” explained this mean difference given that p value?
#4.
a. What is your decision regarding the null hypothesis given the p value? Accept or reject?
b. Are the results “significant” or “not significant?”
#5. What is your overall conclusion given your statistical findings?
17 13
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 3 images
