Practice Problems: Chapter 10
1.
Two-tail, Z test ( is known)
H0: = 375
H1: 375
Test Statistic:
Critical Value: 1.96 with = 0.05 (0.5 0.05/2 = 0.475)
Decision: Reject H0 (Test statistic < (-) Critical value)
Conclusion: There is evidence that the populati
QM 3341: Business Statistics
Practice Problems: Chapter 11
1. A recent study focused on the number of times men and women send a Twitter
message in a day. The information is summarized below.
Sample Size
Sample Mean
Population
Standard Deviation
Men
25
20