Part 3: Single sample hypothesis testing (5 pts total) A psy peopl chologist is
ID: 3319900 • Letter: P
Question
Part 3: Single sample hypothesis testing (5 pts total) A psy peopl chologist is interested in conditions that affect the number of dreams per month in which le report they were alone in their dreams. Based on extensive previous research, it is known at in the general population the number of such dreams per month follows a normal curve, with 4. The researcher wants to test the prediction that the number of such dreams will be greater among people who have recently experienced a traumatic event. Thus, the researcher 5, and = for a month and report the number of dreams for which they were alone. Their mean number of alone dreams is 10 Use the five steps of null hypothesis significance testing to determine if the researchor should conclude that people who have recently experienced a traumatic event have a significantly greater number of alone dreams than the general population. Use the .05 significance level a. i. Describe the two populations being compared then state the null and research hypotheses using POPULATION PARAMETER SYMBOLS. i. Determine the characteristics of the comparison distribution. ii. Determine the cut-off sample score on the comparison distribution at which the null hypothesis should be rejected. (use.05 significance level) Determine your sample's score on the comparison distribution. Decide whether to reject the null and state the conclusion the researcher should draw in plain English. iv. v.Explanation / Answer
a) Ho: mu = 5
Ha: mu > 5
ii) z-test will be used
iii) at 0.05 significance level
z-critical = 1.645
iv) TS = (10 - 5)/(4/sqrt(35))
= 7.395099
v) since TS > critical value
we reject the null hypothesis