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In: Statistics and Probability

A company produces electric devices operated by a thermostatic control. The standard deviation of the temperature...

A company produces electric devices operated by a thermostatic control. The standard deviation of the temperature where the controls operate should not exceed 2.0 degrees Fahrenheit. For a random sample of 20 of these controls, the sample standard deviation of operating temperatures was 2.36 degrees Fahrenheit.

i) Stating any necessary assumptions, test, at the 5% level, the null hypothesis that the population standard deviation is 2.0 against the alternative that it is larger.

ii) Create a 90% confidence interval for the population variance.

Solutions

Expert Solution

i)

ii)

orchestra answered 1 year ago
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