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A health insurance broker records the monthly extended health and dental insurance premiums for 18 non-smoking white-collar clients between the ages of 31 and 40 (measured in $):
48
138
118
132
140
46
143
104
108
94
53
57
129
127
124
144
117
a. Calculate the sample mean and standard deviation.
x¯ =
Round to the nearest cent
S=
b. Construct a 90% confidence interval for the mean monthly insurance premium for all non-smoking white-collar clients between the ages of 31 and 40.
< μ <
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