Find the value of the standardscore, z, and determine whether to reject the null hypothesis at a 0.05 significance level. Is the alternative hypothesissupported?

H0: =18.5 meters, Ha: 18.5 meters, n=49, x=19.3 meters, =1.2 meters

The value of the standard score is ?

.

(Round to two decimal places asneeded.)

The criticalvalue(s) is/are ?

.

(Use a comma to separate answers as needed. Round to two decimal places asneeded.)

Determine whether the alternative hypothesis is supported at a 0.05 significance level.

A.

The standard score is lessextremethan the criticalvalue(s). Donotreject H0. The alternative hypothesis isnot supported.

B.

The standard score is atleastasextremeas the criticalvalue(s). Donotreject H0. The alternative hypothesis isnot supported.

C.

The standard score is atleastasextremeas the criticalvalue(s). Reject H0. The alternative hypothesis is supported.

D.

The standard score is lessextremethan the criticalvalue(s). Reject H0. The alternative hypothesis is supported.