To test his hypotheses that students who finish an exam first get better grades, a professor kept track of the order in which papers were handed in. Of the first 26 papers, 12 received a B or better compared with 6 of the last 22 papers handed in.

(a1)	Choose the appropriate hypotheses. Let represent the grades of the first group and represent the grades of the second group.

a.	H0: 0 vs. H1: < 0.
b.	H0: 0 vs. H1: > 0.

(a2)	Specify the decision rule at = .10. (Round your answer to 2 decimal places).

Reject the null hypotheses if z_calc > .

(a3)	Find the test statistic zcalc and p-value. (Do not round intermediate calculations. Round proportions to 4 decimal places. Round your final answers to 4 decimal places.)

zcalc
p-value