# Use the information given in the previous exercise to construct and interpret a 90% confidence interval estimate

## Question:

In previous exercise

In the study described in the paper €œExposure to Diesel Exhaust Induces Changes in EEG in Human Volunteers€ (Particle and Fibre Toxicology [2007]), 10 healthy men were exposed to diesel exhaust for 1 hour. A measure of brain activity (called median power frequency, or MPF) was recorded at two different locations in the brain both before and after the diesel exhaust exposure. The resulting data are given in the accompanying table. For purposes of this exercise, assume that the sample of 10 men is representative of healthy adult males.

Construct and interpret a 90% confidence interval estimate for the difference in mean MPF at brain location 1 before and after exposure to diesel exhaust.

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