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# Confidence interval for mean

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Hack WilsonÂ¿s major league record of 190 runs batted in during a single season in professional baseball has stood for 70 years. Perhaps the reason for this longevity is that the average for all the other league leaders is so far below the total Wilson knocked in back in 1930. A confidence interval might provide a clue. A random sample of 40 other league-leading RBI season totals is shown below:

109
175
145
125 121
163
136
129 103
174
132
121 128
145
143
139 115
125
142
122 103
128
130
133 141
124
119
123 137
138
127
121 131
159
109
125 143
129
140
129

Construct a 99% confidence interval for the mean of all major league RBI leaders in a season.

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#### Solution Summary

This solution gives the step by step method for computing confidence interval for estimating population mean.

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