A random sample of the price of gasoline from 30 gas stations in a region gives...

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Statistics

A random sample of the price of gasoline from 30 gas stations ina region gives the statistics below. Complete parts a through cbelow.
y=â€‹ $3.89â€‹, SE (y) =â€‹$0.06
â€‹a) Find a 95â€‹% confidence interval for the mean price ofregular gasoline in that region.
â€‹(Round to three decimal places asâ€‹ needed.)
â€‹b) Find theâ€‹ 90% confidence interval for the mean.
â€‹(Round to three decimal places asâ€‹ needed.)
â€‹c) If we had the same statistics from a sample of 60â€‹stations,what would theâ€‹ 95% confidence interval beâ€‹ now?
â€‹(Round to three decimal places asâ€‹ needed.)

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4.1 Ratings (806 Votes)

Here we haves033aSince there 30data values in the sample so degree offreedom is df30129 and critical value of t for 95 confidenceinterval is See Answer

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