Mondays Blues

Unit 6, Topic 24, Exercise 2425







Unit 6, Topic 25, Exercise 2522
Preventing Breast Cancer
The Study of Tamoxifen and Raloxifene (STAR) enrolled more than postmenopausal women who were at increased risk for breast cancer. Women were randomly assigned to receive one of the drugs (tamoxifen or raloxifene) daily for five years. During the course of the study, researchers kept track of which women developed invasive breast cancer and which women did not. The initial results released in April 2006 revealed that of women in the tamoxifen group had developed invasive breast cancer, compared to of the women in the raloxifene group.
a. Organize this information into a table.
Tamoxifen  Raloxifene  Total  
Breast Cancer  
No Breast Cancer  
Total 
 Calculate the expected counts, under the null hypothesis that the population proportions of women who would develop breast cancer are the same with both treatments.
Round your answers to three decimal places.
Tamoxifen  Raloxifene  
Breast Cancer  
No Breast Cancer 
 Conduct a chisquare test on these data. Report the hypotheses, test statistic, and value. Summarize your conclusion.
Round the test statistic to three decimal places. Use the chisquare distribution table to find a range for the value. If there is no lower limit on the value, enter for the lower limit. If there is no upper limit on the value, enter for the upper limit.
≠ = >
≠ = >
The test statistic is .
value
We reject do not reject .
 Suppose someone else decided to perform a twosample test and found that and value Comment on how this compares to the test statistic and value you just calculated.
The test statistic of the chisquare test is roughly the square root of the square of double half of the same as the test statistic of the twosample test.
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