in 2019, investigators from brown university would like to determine the relationship of nail polish remover and ovarian cancer in women. a cohort of n-1000 beauticians aged 18-64 years old was identified and followed up after five years. after the follow-up period, there were x - 20 new cases of breast cancer were diagnosed. it is known that the incidence of ovarian cancer over the time period for average American women is 7/1000. the researchers wish to determine if the incidence computed in this study is equal to the incidence known in America at 0.01 level of significance. The test statistics to be used in problem b is ___ and the critical region was set at ____ a. t-test, 1.96 b. z-test, 1.96 c. z-test, 2.58 ad. t-test, 2.58
in 2019, investigators from brown university would like to determine the relationship of nail polish remover and ovarian cancer in women. a cohort of n-1000 beauticians aged 18-64 years old was identified and followed up after five years. after the follow-up period, there were x - 20 new cases of breast cancer were diagnosed. it is known that the incidence of ovarian cancer over the time period for average American women is 7/1000. the researchers wish to determine if the incidence computed in this study is equal to the incidence known in America at 0.01 level of significance.
The test statistics to be used in problem b is ___ and the critical region was set at ____
a. t-test, 1.96
b. z-test, 1.96
c. z-test, 2.58
ad. t-test, 2.58
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