If we were comparing the difference between the mean number of sports drinks consumed by males versus females,and we calculated a z value of 6.43,we would conclude that:
A)the probability of support of the null hypothesis of no difference is less than .01 because 6.43 is greater than 2.58.
B)the probability of support of the alternative hypothesis of no difference is less than .01 because 6.43 is greater than 2.58.
C)the probability of support of the null hypothesis of no difference is less than .01 because 6.43 is less than 2.58.
D)the probability of support of the alternative hypothesis of no difference is less than .01 because 6.43 is less than 2.58.
E)there is a 6.43 percent chance that the two means are not significantly different.

Question

Quizplus · Accepted Answer

A z value of 6.43 is very high and falls in the rejection region of a standard normal distribution. The rejection region for a two-tailed test with a significance level of .01 is ±2.58. Therefore, we can reject the null hypothesis of no difference between the mean number of sports drinks consumed by males versus females, and conclude that the probability of support of the null hypothesis is less than .01.

If We Were Comparing the Difference Between the Mean Number