12. In order to determine whether or not a particular medication was effective i
ID: 3053468 • Letter: 1
Question
12. In order to determine whether or not a particular medication was effective in curing the common cold, one group of patients was given the medication, while another group received sugar pills. The results of the study are shown below. Patients Cured Patients Not Cured Received medication 70 10 Received sugar pills 20 50 We are interested in determining whether or not the medication was effective in curing the common cold. The expected frequency of those who received medication and were cured is a. 70 b. 150 c. 28 d. 48 13. Refer to the information of Q12. The test statistic (chi-square) is a. 10.08 b. 54.02 c. 1.96 d. 1.645 14. Refer to the information of Q12. The number of degrees of freedom associated with this problem is a. 4 b. 149 c. d. 3 15. Refer to the information of Q12-The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals a. 3.84 b. 7.81 c. 5.99 d. 9.34 16. Refer to the information of Q12-15. The conclusion of the test is that the a. Proportions of being cured are equal b. Proportions of being cured are not equal c. Test is inconclusive d. None of these alternatives is correct.Explanation / Answer
The statistical software output for this problem is:
Contingency table results:
Rows: var1
Columns: None
Chi-Square test:
Hence,
12. Expected frequency = 48; Option D is correct.
13. Test statistic = 54.02; Option B is correct.
14. Degrees of freedom = 1; Option C is correct.
15. Critical value = 3.84; Option A is correct.
16. Option B is correct.
Cell format Count(Expected count)
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