Discussion:
1. a)In a study designed to the test the effectiveness of magnets for treating back pain, 40 patients were given a treatment with magnets and also a sham treatment without magnets. Pain was measured using a scale from 0(no pain) to 100 (extreme pain). After given the magnets treatments, the 40 patients had pain scores with a mean of 6.0 and a standard deviation of 2.6. After being given the sham treatments the 40 patients had pain scores with a mean of 7.8 and a standard deviation of 2.2.
b) Construct the 90% confidence interval estimate of the mean pain score for patients given sham treatment.
What is the confidence interval estimate of the population mean µ?
___< µ<____
2. Assume that a random sample is used to estimate a population p. Find the margin of error E that corresponds to the given statistics and confidence level. N=550, x=275, 90% confidence.
The margin of error E=____
3. Listed below are the budgets (in millions of dollars) and the gross receipts (in millions of dollars) for randomly selected movies.
|
Budget (x)
|
65
|
94
|
47
|
40
|
191
|
103
|
90
|
|
Gross (y)
|
64
|
69
|
43
|
54
|
567
|
141
|
44
|
a. Find the value of the linear correlation coffiecient r.
R=____(critical values for correlation coefficient table )
Attachment:- Critical values.rar