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# \$15.00Psy/315 Statistical Reasoning in Psychology

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14.

based on the information given for each of the following studies decide whether to reject the null hypothesis.  fo each, give (a) the Z-cscore 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   u     o         sample score           p                tails of test

A         5     1                7                    .05               1(high predicted)

B         5     1                 7                    .05              2

C         5     1                 7                   .01               1 (high predicted)

D         5      1                7                   .01                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 from 58.  From many previous studies with this same math problems procedure (but not listening to music)  it is known that the signal change in the brain area is normally distributed wiith a mean of 35 and a standard deviation of 10.  (a) using the .01 level, what should the researcher conslude? Solve this problem explicitly using all five steps of hypothesis testing, ad illustrate your answer with a sketch showing the comparison distribution, the cut off or cutoffs, and the score of the sample on this distribution. (b) then explain your answer to someone who has never had a curse in statistics (but who is familiar with  mean,standard deviation and Z scores.

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