The daily revenue at a university snack bar has been recorded for the past five years. Records indicate that the mean daily revenue is 1200 and the standard deviation is 400. The distribution is skewed to the right due to several high volume days (football game days). Suppose that 100 days are randomly selected and the average daily revenue computed. Which of the following describes the sampling distribution of the sample mean?
A) skewed to the right with a mean of 1200 and a standard deviation of 400
B) normally distributed with a mean of 120 and a standard deviation of 40
C) normally distributed with a mean of 1200 and a standard deviation of 400
D) normally distributed with a mean of 1200 and a standard deviation of 40
Question 2
IQ test scores are normally distributed with a mean of 104 and a standard deviation of 16. An individual's IQ score is found to be 115. Find the z-score corresponding to this value.
A) 0.69 B) 1.45 C) -0.69 D) -1.45
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(a) The site of Zhoukoudian outside of Beijing, China, spans several hundred thousand years and (b)
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Rate of Residential Change, Past Year, in the United States
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