part: 0 / 2\npart 1 of 2\nwhen should a one -...
part: 0 / 2\npart 1 of 2\nwhen should a one - tailed test be used?\na one - tailed test is used when the alternative hypothesis should be rejected if the test value is in the critical region on either side of the mean.\na one - tailed test is used when the null hypothesis should be rejected if the test value is in the critical region on either side of the mean.\na one - tailed test is used when the null hypothesis should be rejected if the test value is in the critical region on one side of the mean.\na one - tailed test is used when the alternative hypothesis should be rejected if the test value is in the critical region on one side of the mean.
Answer
# Brief Explanations:
In hypothesis - testing, a one - tailed test focuses on a single direction. The null hypothesis is rejected when the test value is in the critical region on one side of the mean.
# Answer:
A one - tailed test is used when the null hypothesis should be rejected if the test value is in the critical region on one side of the mean.