Assume that the data has a normal distribution and the numbe

Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value used to test a null hypothesis. = 0.12; H1 is 81.9

Solution

The number of bservations is greater than 50.

Let the level of signifiance be 0.05.

Thus, the critical region will be plus minus 1.96.

That is reject the null hypothesis if z<-1.96 or z>+1.96