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Confidence interval for the mean price

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Reference no: EM131210978

A random sample of 9 TI-89 Titanium calculators being sold over the internet had the following prices, in dollars.

135,163,152,153,138,164,160,149,157

Assume the population standard deviation is σ+28 and that the population is approximately normal. Construct a 95% confidence interval for the mean price for all the TI-89's being sold over the internet. Select one: A. (145.5, 159.2) B. (97.5, 207.2) C. (145.6, 159.1) D. (134.0, 170.6)

Reference no: EM131210978

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