Question
QUESTION 3 A company produces wiring that is supposed to be 2.16cm thick on average with a variance of no more than 0.04cm 2 .
QUESTION 3
A company produces wiring that is supposed to be 2.16cm thick on average with a variance of no more than 0.04cm2. A sample of 7 wires is selected and a variance of 0.09cm is found. Assuming that the data has been selected from a normally distributed population, conduct a test at a 5% level of significance to see if the variance of the wiring has increased to more than 0.04cm2.
(5 Marks)
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Statistical Inference
Authors: George Casella, Roger L. Berger
2nd edition
0534243126, 978-0534243128
