Understanding Basic Statistics 6th Edition by Charles Henry Brase,Corrinne Pellillo Brase

تمرين 13

Basic Computation: Find Test Statistic, Corresponding P-value, and Conclude Test A random sample of size 20 from a normal distribution with = 4 produced a sample mean of 8.
(a) Check Requirements Is the
distribution normal Explain.
(b) Compute the sample test statistic z under the null hypothesis H 0 : = 7.
(c). For H 1 : 7, estimate the P -value of the test statistic.
(d) For a level of significance of 0.05 and the hypotheses of parts (b) and (c), do you reject or fail to reject the null hypothesis Explain.