# Question: Using the data from Exercise 4 7 construct a 95 lower

Using the data from Exercise 4.7, construct a 95% lower confidence interval on mean battery life. Why would the manufacturer be interested in a one-sided confidence interval?

## Relevant Questions

A new process has been developed for applying photoresist to 125-mm silicon wafers used in manufacturing integrated circuits. Ten wafers were tested, and the following photoresist thickness measurements (in angstromx × ...Two quality control technicians measured the surface finish of a metal part, obtaining the data in Table 4E.1. Assume that the measurements are normally distributed. (a)Test the hypothesis that the mean surface finish ...A new purification unit is installed in a chemical process. Before its installation, a random sample yielded the following data about the percentage of impurity: x12 9.85,s12 6.79 and n1 10 . After installation, a ...Suppose we are testing the hypotheses H0 : 1 2 H1 : 1 2 where 12 and 22 are known. Resources are limited, and consequently the total sample size n1 + n2 = N. How should we allocate the N ...Suppose that you are testing the following hypotheses where the variance is unknown: H0 : 100 H1 : 100 The sample size is n = 20. Find bounds on the P-value for the following values of the test statistic. (a) ...Post your question