Parking at a large university can be extremely difficult at times. One particular university is trying to determine the location of a new parking garage.
As part of their research, officials are interested in estimating the average parking time of students from within the various colleges on campus. Which of the following would represent the target parameter of interest?
A) p B)
Q. 2Suppose x is a uniform random variable with c = 20 and d = 80. Find the standard deviation of x.
A) = 2.24 B) = 17.32 C) = 28.87 D) = 2.89
Q. 3The Central Limit Theorem states that the sampling distribution of the sample mean is approximately normal under certain conditions. Which of the following is a necessary condition for the Central Limit Theorem to be used?
A) The population from which we are sampling must be normally distributed.
B) The population size must be large (e.g., at least 30).
C) The population from which we are sampling must not be normally distributed.
D) The sample size must be large (e.g., at least 30).
Q. 4The expected value of a discrete random variable must be one of the values in which the random variable can result.
A) True B) False
Q. 5The diameters of ball bearings produced in a manufacturing process can be described using a uniform distribution over the interval 8.5 to 10.5 millimeters.
What is the mean diameter of ball bearings produced in this manufacturing process?
A) 9.0 millimeters B) 9.5 millimeters C) 10.5 millimeters D) 10.0 millimeters
Q. 6A study was conducted to determine what proportion of all college students considered themselves as full-time students.
A random sample of 300 college students was selected and 210 of the students responded that they considered themselves full-time students. Which of the following would represent the target parameter of interest?
A) p B)
Q. 7Which of the following describes what the property of minimum variance means?
A) The center of the sampling distribution is found at the population parameter that is being estimated.
B) The shape of the sampling distribution is approximately normally distributed.
C) The center of the sampling distribution is found at the population standard deviation.
D) The sampling distribution in question has the smallest variation of all possible unbiased sampling distributions.
Q. 8Mamma Temte bakes six pies each day at a cost of 2 each. On 31 of the days she sells only two pies. On 18 of the days, she sells 4 pies, and on the remaining 51 of the days, she sells all six pies.
If Mama Temte sells her pies for 4 each, what is her expected profit for a day's worth of pies? Assume that any leftover pies are given away.
A) 17.60 B) -8.00 C) 5.60 D) -7.60
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