statistics
posted by TLC .
Use the following information and data for questions 15. A group of researchers hypothesizes that listening to music while studying for an exam influences test scores. They randomly selected 28 subjects and randomly assigned them to one of four groups. All groups studied for a test one hour a day for a week. Group 1 studied without music. Group 2 studied with classical music in the background, group 3 with country, and group 4 with jazz. The following are the final test scores:
Group 1 Group 2 Group 3 Group 4
50 59 60 49
45 57 49 45
42 57 56 45
41 55 55 42
40 56 54 41
39 53 51 39
44 48 46 47
What test is most appropriate for this data and hypothesis?
Chisquare
Analysis of Variance
Dependent ttest
OneSample ztest
Question 2
What is the null hypothesis?
mGroup1 > mGroup 2 > mGroup3 > mGroup4
mGroup1 < (mGroup 2 + mGroup3 + mGroup4) / 3
mGroup1 = mGroup 2 = mGroup3 = mGroup4
Question 3
What is the value for the observed test statistic?
2.55
17.16
28.59
Question 4
The degrees of freedom for the test are:
3 and 6
4 and 27
3 and 24
4 and 28
Question 5
If the alpha level chosen is .01, the researchers can conclude from the Ftest results that:
Groups 1 and 2 are significantly different from Groups 3 and 4
Groups 2, 3, and 4 are significantly different than the Control (Group 1).
There is a significant difference among these groups.
There are no significant differences among the groups.

Here are a few comments to get you started.
There is a hint of the type of test to perform on this data in Question 5. (Hint: Ftest)
Null hypothesis uses equal signs.
Compute the test statistic based on the test chosen for the data.
Degrees of freedom for this type of Ftest:
To calculate df between:
k  1
Note: k = number of levels or groups.
To calculate df within:
N  k
Note: N = total number of values in all levels or groups.
If the null is rejected, there is a significant difference among the groups.
If the null is not rejected, then there is no difference.
I'll let you take it from here. 
idk
Respond to this Question
Similar Questions

Stats  Post Hoc Analysis
This is a question I am working on. i have successfully figured out part A and am having trouble with part B. (My work for Part B is shown below) ______________________________________ Two new therapies designed to increase levels … 
statistics
Can someone please explain to me the procedures for getting an answer to the questions. Step by step would be great since I'm very confused. I know it's probably simple. * Numerous studies have demonstrated that listening to music … 
statistics
Twenty (20) students randomly assigned to an experimental group are studying for a test while listening to classical music. Thirty (30) students randomly assigned to a Control group are studying for the same test in complete silence. … 
Statistics
Twenty (20) students randomly assigned to an experimental group are studying for a test while listening to classical music. Thirty (30) students randomly assigned to a control group are studying for the same test in complete silence. … 
statistics
The data below are the final exam scores of 10 randomly selected statistics students and the number of hours they studied for the exam. Calculate the correlation coefficient r. 
Statistics
5. Scores on a recent national statistics exam were normally distributed with a mean of 80 and a standard deviation of 6. a. What is the probability that a randomly selected exam will have a score of at least 71? 
statistics
A student is interested in whether students who study with music playing devote as much attention to their studies as do students who study under quiet conditions (he believes that studying under quiet conditions leads to better attention). … 
Statistics
Scores on a visual perception test are normally distributed with a mean of 2020 and a standard deviation of 250. a)If one subject is randomly selected and tested, find the probability of a score greater than 1800 b)if 50 subjects are … 
statistics
Scores on a visual perception test are normally distributed with a mean of 2020 and a standard deviation of 250. a)If one subject is randomly selected and tested, find the probability of a score greater than 1800 b)if 50 subjects are … 
math
Test scores on a university admissions test are normally distributed, with a mean of 500 and a standard deviation of 100. a. What is the probability that a randomly selected applicant scores between 425 and 575?