A random sample of 64 drivers used on average 750 gallons of gasoline per year. The standard deviation of the population is 31 gallons. Find the 90% confidence interval of the mean for all drivers. Round intermediate answers to at least three decimal places. Round your final answers to the nearest whole number.
Added by Sandra P.
Step 1
645 Margin of error = Critical value * (σ / √n) Margin of error = 1.645 * (31 / √64) Margin of error = 1.645 * (31 / 8) Margin of error = 1.645 * 3.875 Margin of error = 6.367875 Show more…
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