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Among children under the age of 7, 134 out of 548 tested positive for the H1N1 virus in a large school district. For children between the ages of 7 and 12, 28.4% out of 750 tested positive for H1N1. Construct the 95% confidence interval for the difference in percent infections between children under the age of 7 and 7 or older.
Two sample mean problem:
Two groups of laboratory rats are raised in different size cages. Group A rats were raised in cages four times as large as the rats in Group B. Based on the data below, use a 90% to determine if there is a difference in the body weights. Be sure to interpret your confidence interval in the context of the problem.
Group A Group B
Mean 418g 392g
Standard Deviation 35g 42g
Sample Size 43 38
ANSWERS
22.
Ho: mu <= 650
Ha: mu > 650
z* = 1.17
p = .121
Fail to reject, there is not enough evidence to suggest that the daily cost is more than $650. We cannot reject the claim.
2 Sample Proportion CI
-.039 +/- .049 = (-.088,.010)
2 Sample Mean CI
26 +/- 14.23 = (11.8,40.2)