Consider the following hypothesis test:
H 0:Â Â Â 20
H a:Â Â < 20
A sample of 50 provided a sample mean of 19.4. The populationstandard deviation is 2.
a. Compute the value of the test statistic (to2 decimals).
b. What is the p-value (to 3decimals)?
c. Using  = .05, can it be concludedthat the population mean is less than 20?
d. Using  = .05, what is the criticalvalue for the test statistic?
e. State the rejection rule: Reject H0 if z is
greater than or equal to
greater than
less than or equal to
less than equal to
not equal toItem 5Â Â the critical value.
