In a two-tailed test for the population mean, the null hypothesis will be rejected at level of significance if the value of the test statistic z is such that:
a. | z | >
b. | z | < –
c. z > –
d. | z | >
e. | z | <"

b. | z | < =

Step-by-step explanation:

Two-tailed test is used to examine both sides of a specified data range as designated by the probability distribution involved. The probability distribution should represent the likelihood of a specified outcome based on the predetermined standards. This includes the setting of a limit designating the highest (or upper) and lowest (or lower) accepted variable values included within the range. Any data point that exists above the upper limit or below the lower limit is considered out of the acceptance range and in an area referred to as the rejection range.

4a. is 3 miles every hour

4b. is 1/3 of an hour per mile

step-by-step explanation: