A pharmaceutical company reports that in testing whether their new cancer drug increases the mean survival time for certain types of cancer? patients, their results were statistically significant. Suppose that in testing H0?: μ=100 versus Ha?: μ >100 they obtain x=101 and s=5 for a random sample of 400 patients. Find the test statistic and discuss the practical significance of the test.
A. t=-?4; although the test is statistically? significant, the increase of 1 day is not practically significant.
B. t=?4; since the? P-value is less than? 0.05, the test is practically significant.
C. t=-?4; since the? P-value is less than? 0.05, the test is practically significant.
D. t=?4; although the test is statistically? significant, the increase of 1 day is not practically significant.