Which of the following statements are true A In a twotail te

Which of the following statements are true?

(A) In a two-tail test of hypothesis for a population mean the decision rule is to reject H₀ if the test statistic lies outside of the critical values (action limits).

(B)  A statistical test of hypothesis is performed under the assumption that the null hypothesis is false.

(C)  A test of hypothesis for a population mean is called a lower tail test if the decision rule is to reject Ho if the test statistic is less than the critical value (action limit).

(D)  In the test of hypothesis for the claim that the mean grade of students in a statistics course is more than 70%, the type I error would consist of concluding that the mean is 70% or less when in fact it is greater than 70%.

Question 1 options:

a)A and C only

b)B and C only

c)B and D only

d)A and D only

Solution

(B)  A statistical test of hypothesis is performed under the assumption that the null hypothesis is false. TRUE

(C)  A test of hypothesis for a population mean is called a lower tail test if the decision rule is to reject Ho if the test statistic is less than the critical value (action limit). TRUE