A twotailed hypothesis test would not be used if the test st

A two-tailed hypothesis test:

would not be used if the test statistic could be negative.

will double the probability of rejecting the null hypothesis.

is used when the direction of the test is of no research interest.

would lead to rejection more often than a one-tailed test at the same ?.

Solution

A two-tailed hypothesis test: will double the probability of rejecting the null hypothesis.

Note:

i)P-value in two-tailed test, if test statistic is positive is,

P-value = 2 * P(Z > Z_STAT )

ii)P-value in two-tailed test , if test statistic is negative is,

P-value = 2 * P(Z < - Z_STAT)