Question

A sociologist surveys 50 randomly selected citizens in each of two countries to compare the mean number of hours of volunteer work done by adults in each. Among the 50 inhabitants of Lilliput, the mean hours of volunteer work per year was 52, with standard deviation 11.8. Among the 50 inhabitants of Blefuscu, the mean number of hours of volunteer work per year was 37, with standard deviation 7.2.

Answer 1

Answer:

Step-by-stepConstruct the confidence interval for μ1−μ2 for the level of confidence and the data from independent samples given.

90% confidence,

n1=45,x1¯=27,s1=2n2=60,x2¯=22,s2=3(9.E.1)

99% confidence,

n1=30,x1¯=−112,s1=9n2=40,x2¯=−98,s2=4(9.E.2) explanation: