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
Statistics (12th Edition)
by McClave, James T.; Sincich, Terry T.
Published by
Pearson
ISBN 10:
0321755936
ISBN 13:
978-0-32175-593-3
Chapter 9 - Inferences Based on Two Samples - Exercises 9.1 - 9.29 - Applying the Concepts - Basic - Page 424: 9.15a
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