Answer to Question #44513 in Statistics and Probability for yesy

Question #44513

IQ of professional Pilots
The Wechsler IQ test is designed so that the mean is 100 and the standard deviation is 15 for the population of normal adults. Listed below are IQ scores of randomly selected professional pilots. It is claimed that because professional pilots are a more homogeneous group than the general population, they have IQ scores with a standard deviation less than 15. Test that claim using a 0.05 significance level.
Assume that a simple random sample is selected from a normally distributed population.
121 116 115 121 116 107 127 98 116 101 130 114
Identify the null hypothesis:

Alternative hypothesis:
Test statistic:
P-Value or critical value(s):

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