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.
Received medication _____________ Received sugar pills
Patients cured........................70........................20
Patients not cured....................10........................50
12. 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. 1
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