Using the output in Exercise 9: a. Find the critical value z2 for a 99% confidence interval.
Question:
Using the output in Exercise 9:
a. Find the critical value zα∕2 for a 99% confidence interval.
b. Use the critical value along with the information in the output to construct a 99%
confidence interval for the mean reading of the scale.
Exercise 9
To estimate the accuracy of a laboratory scale, a weight known to have a mass of 100 grams is weighed 32 times. The reading of the scale is recorded each time. The following MINITAB output presents a 95% confidence interval for the mean reading of the scale.
A scientist claims that the mean reading μ is actually 100 grams. Is it likely that this claim is true?
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