The registrar's office at State University would like to determine a 95 confidence interval for the mean commute time of its students. A member of the staff randomly chooses a parking lot and surveys the first 150 students who park in the chosen lot on a given day. The confidence interval is
A) meaningful because the sample is representative of the population.
B) not meaningful because of the lack of random sampling.
C) meaningful because the sample size exceeds 30 and the Central Limit Theorem ensures normality of the sampling distribution of the sample mean.
D) not meaningful because the sampling distribution of the sample mean is not normal.
Question 2
The diameters of ball bearings produced in a manufacturing process can be described using a uniform distribution over the interval 3.5 to 5.5 millimeters. What is the probability that a randomly selected ball bearing has a diameter greater than 4.8 millimeters?
A) 0.35 B) 2 C) 0.5333 D) 0.8727
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