Given the sample variance of a distribution, explain how to find the standard deviation.
What will be an ideal response?
Q. 2In one study of the moral of company's employees, 10 employees were randomly chosen from each of the departments within the company. Identify the sampling design used.
What will be an ideal response?
Q. 3A music store has 8 male and 12 female employees. Suppose one employee is selected at random and the employee's gender is observed. List the sample points for this experiment, and assign probabilities to the sample points.
A) male, female; P(male) = .8 and P(female) = .12 B) 8, 12; P(8 ) = .5 and P(12 ) = .6
C) 8, 12; P(8 ) = .8 and P(12 ) = .12 D) male, female; P(male) = .4 and P(female) = .6
Q. 4Various state and national automobile associations regularly survey gasoline stations to determine the current retail price of gasoline.
Suppose one such national association contacts 200 stations in the United States to determine the price of regular unleaded gasoline at each station. In the context of this problem, define the following descriptive measures: , , , s.
Q. 5A clothing vendor estimates that 78 out of every 100 of its online customers do not live within 50 miles of one of its physical stores.
Using this estimate, what is the probability that a randomly selected online customer does not live within 50 miles of a physical store?
A) .28 B) .22 C) .50 D) .78
Q. 6When using data from a published source, it is not important to know how the data were collected and whether randomization was used.
A) True B) False
Q. 7Which of the following is a measure of the variability of a distribution?
A) median B) range C) skewness D) sample size
Q. 8At a community college with 500 students, 120 students are age 30 or older. Find the probability that a randomly selected student is age 30 or older.
A) .24 B) .12 C) .30 D) .76
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