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Consider a Set of 50 Measurements with Mean 50 It Is Desired to Test Whether These Measurements Came from Standard

question 63

Essay

Consider a set of 50 measurements with mean 50.2 and standard deviation 18.7 and with the following observed frequencies.  Interval  Observed Frequencies 39.99 and less 124059.99186079.991580-and higher 5\begin{array} { l c } \text { Interval } & \text { Observed Frequencies } \\39.99 \text { and less } & 12 \\40 - 59.99 & 18 \\60 - 79.99 & 15 \\80 \text {-and higher } & 5\end{array} It is desired to test whether these measurements came from a normal population.
-Calculate the expected frequency for the interval 40 - 59.99.


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