Wednesday
September 17, 2014

Homework Help: PSY315

Posted by Ashley on Saturday, April 14, 2012 at 4:53pm.

Based on the information given for each of the following studies, decide whether to reject the null hypothesis. For each, give (a) the Z-score cutoff (or cutoffs) on the comparison distribution at which the null hypothesis should be rejected,(b) the Z score on the comparison distribution for the sample score, and (c) your conclusion. Assume that all populations are normally distributed.
Population
Study Sample Score p Tails of Test
A
100.0
10.0
80
.05
1 (low predicted)

B
100.0
20.0
80
.01
2

C
74.3
11.8
80
.01
2

D
16.9
1.2
80
.05
1 (low predicted)

E
88.1
12.7
80
.05
2

18. A researcher predicts that listening to music while solving math problems will make a particular brain area more active. To test this, a research participant has her brain scanned while listening to music and solving math problems,and the brain area of interest has a percentage signal change of 58. From many previous studies with this same math problems procedure (but not listening to music), it is known that the signal change in this brain area is normally distributed with a mean of 35 and a standard deviation of 10. (a) Using the .01 level, what should the researcher conclude? Solve this problem explicitly using all five steps of hypothesis testing, and illustrate your answer with a sketch showing the comparison distribution, the cutoff (or cutoffs),and the score of the sample on this distribution. (b) Then explain your answer to someone who has never had a course in statistics (but who is familiar with mean, standard deviation, and Z scores).

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

psychology statistics - 15. Based on the information given for each of the ...
Math - Based on the information given for each of the following studies, decide ...
statistics psy/315 - Based on the information given for each of the following ...
statistics - Use the given information to find the P-value. Also, use a 0.05 ...
Statistics - Please Help I'm desperate! Complete the hypothesis test with ...
Statistics - What does it mean when a researcher chooses the cutoff in a ...
Statistical reasoning in Psychology - 4. Suppose that previous studies have ...
stats - For each of the following situations, determine: a) the null and ...
statistics - An analysis of variance is used to evaluate the mean differences ...
statistics - In a chi-squared test of a contingency table, the value of the test...

Search
Members