#### Answer

Null hypothesis is that level of mean recall for both groups is same. Hence:
$H_{o}: µ_{1} = µ_{2}$ or $µ_{1} - µ_{2} = 0$
$H_{a}: µ_{1} \ne µ_{2}$ or $µ_{1} - µ_{2} \ne 0$

#### Work Step by Step

As above

Chegg costs money, GradeSaver solutions are free!

Published by
Pearson

ISBN 10:
0321755936

ISBN 13:
978-0-32175-593-3

As above

You can help us out by revising, improving and updating this answer.

Update this answerAfter you claim an answer you’ll have **24 hours** to send in a draft. An editor
will review the submission and either publish your submission or provide feedback.