Question: Refer to Example 12 concerning the improvement in lost worker-hours. Obtain a (90 %) confidence interval for the mean of this paired difference. Data From

Refer to Example 12 concerning the improvement in lost worker-hours. Obtain a $90 \%$ confidence interval for the mean of this paired difference.

Data From Example 12

EXAMPLE 12 Calculating a log-normal probability The current gain of certain transistors

EXAMPLE 12 Calculating a log-normal probability The current gain of certain transistors is measured in units which make it equal to the logarithm of Io/Ii, the ratio of the output to the input current. If this logarithm is normally distributed with = 2 and = 0.1, find the probability that Io/I; will take on a value between 6.1 and 8.2.

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