A research group conducted a study of the effectiveness of educational software. In one phase of the study, a random sample of 1,515 first-grade students in classrooms that used educational software (2) was compared to a random sample of 1,108 first-grade students in classrooms that did not use the technology (1). In the study, the group wanted to determine if mean test scores were significantly lower in classrooms that did not use educational software (1) than in classrooms using software products (2). The hypothesis test is conducted at =.05.

1) Which test should be used?

a) paired t test for means

b) paired z test for means

c) z test for means

d) t test for means

e) z test for proportions

2) Which hypotheses should the researchers use to determine if mean test scores were significantly higher in classrooms using educational software products (1) than in classrooms that did not use educational software (2) ?

a) H0:12=0,HA:12<0

b) H0:12=0,HA:12>0

c) H0:p1p2=0,HA:p1p2<0

d) H0:p1p2=0,HA:p1p20

e) H0:p1p2=0,HA:p1p2>0

f) H0: u1-u2=0, HA: u1-u20

3) The p-value was reported to be .5100. What is the conclusion of the test?

a) Fail to reject H0. There is sufficient evidence at=.05 to conclude that mean test scores are significantly lower in classrooms not using educational software products than in classrooms that do use educational software.

b) Reject H0. There is insufficient evidence at =.05 to conclude that mean test scores are significantly lower in classrooms not using educational software products than in classrooms that do use educational software.

c) Fail to reject H0. There is insufficient evidence at =.05 to conclude that mean test scores are significantly lower in classrooms not using educational software products than in classrooms that do use educational software.

d) Reject H0. There is sufficient evidence at=.05 to conclude that mean test scores are significantly lower in classrooms not using educational software products than in classrooms that do use educational software.