statistics (7)

The average cost per night of a hotel room in New York City is $273 (SmartMoney, March 2009). Assume this estimate is based on a sample of 45 hotels and that the sample standard deviation is $65.
a. With 95% confidence, what is the margin of error (to 2 decimals)?

b. What is the 95% confidence interval estimate of the population mean?

NOTE: This is what I got but it is wrong.
a. 18.99
b. [254.008, 291.992]

  1. 👍 0
  2. 👎 0
  3. 👁 210
  1. z table
    a) 18.99167069

    b) (254, 292)

    1. 👍 0
    2. 👎 0

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