Author Question: The number of cars running a red light in a day, at a given intersection, possesses a distribution ... (Read 97 times)

MGLQZ · **on:** Jun 24, 2018

The number of cars running a red light in a day, at a given intersection, possesses a distribution with a mean of 4.7 cars and a standard deviation of 5. The number of cars running the red light was observed on 100 randomly chosen days and the mean number of cars calculated. Describe the sampling distribution of the sample mean.

A) shape unknown with mean = 4.7 and standard deviation = 5
B) approximately normal with mean = 4.7 and standard deviation = 5
C) shape unknown with mean = 4.7 and standard deviation = 0.5
D) approximately normal with mean = 4.7 and standard deviation = 0.5

Question 2

A study of college students stated that 25 of all college students have at least one tattoo. In a random sample of 80 college students, let x be the number of the students that have at least one tattoo. Can the normal approximation be used to estimate the binomial distribution in this problem?

A) No B) Yes

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