The average selling price of a smartphone purchased by a random sample of 43 customers was...
The average selling price of a smartphone purchased by a random sample of 43 customers was $315. Assume the population standard deviation was $34.
a. Construct a 95% confidence interval to estimate the average selling price in the population with this sample.
b. What is the margin of error for this interval?
a. The 95% confidence interval has a lower limit of and an upper limit of.
(Round to the nearest cent as needed.)
b. The margin of error is.
(Round to the nearest cent as needed.)
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