Homework Help: statistics

Posted by fredia on Wednesday, February 9, 2011 at 9:12pm.

A family therapist states that all parents in America talk to their teenagers an average of 17 minutes per week. A psychologist decides to test this by collecting data from a sample of 9 parents on how much time they spend talking to their teenagers per week. Alpha .05, 2-tailed.
X
14
13
12
15
17
18
13
16
14
A. Give calculated score and critical score.
B. Do the psychologists data differ significantly from what the family therapist stated?
C. Is the family therapists claim an overestimate or an underestimate of actual time spent talking to children, compared to the sample size.

statistics - PsyDAG, Thursday, February 10, 2011 at 9:02am
Calculate mean and standard deviation (SD) for your sample.

Z = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√(n-1)

If only one SD is provided, you can use just that to determine SEdiff.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to that Z score.

Answer this Question

Related Questions

Art and Writing Therapist - I just have a few questions. Ok so the main point of...
statistics - The average teenager spends 7.5 hours per week playing computer and...
Algebra 2 - A phone company charges a basic rate of $13.99 per month. In ...
Statistics - 28. A group of statistics students decided to conduct a survey at ...
statistics - To determine how many hours per week freshmen college students ...
Statistics - Let’s suppose a randomly selected sample of 75 American ...
algebra - Joe's electric made 17 customer calls last wk and 23 calls this ...
mat-119 - Greg Tobin sells bottled water. He has found that the average amount ...
Statistics - The average amount of time people spend on facebook each day is 71 ...
statistics - The average amount of time people spend on facebook each day is 71 ...

For Further Reading

First Name:
School Subject:
Answer: