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 ì ó 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).
No one has answered this question yet.
Answer this Question
Related Questions
psychology statistics - 15. Based on the information given for each of the ...
statistics - Use the given information to find the P-value. Also, use a 0.05 ...
Math - Based on the information given for each of the following studies, decide ...
statistics - In a chi-squared test of a contingency table, the value of the test...
statistics - An analysis of variance is used to evaluate the mean differences ...
Statistics - PLEASE CHECK AND SEE IF I HAVE THESE ANSWERS CORRECT. T F 1. ...
Stat - PLEASE CHECK AND SEE IF I HAVE THESE ANSWERS CORRECT. T F 1. Hypothesis ...
Applied Statistics - Assignment Guidelines Perform a two-tailed hypothesis test ...
STATS - Given a sample size of 18, with sample mean 660.3 and sample standard ...
statistics - Get an answer from tutors to this homework question now:have to: (a...
For Further Reading
