Biology Forums - Study Force

Management at a home improvement store randomly selected 45 customers and observed their
  shopping habits. They recorded the number of items each of the customers purchased as well as
  the total time the customers spent in the store.
 
  Identify the types of variables recorded by the
  managers of the home improvement store.
  A) number of items - continuous; total time - discrete
  B) number of items - discrete; total time - discrete
  C) number of items - discrete; total time - continuous
  D) number of items - continuous; total time - continuous

Q. 2

At the U.S. Open Tennis Championship a statistician keeps track of every serve that a
  player hits during the tournament.
 
  The statistician reported that the mean serve speed of
  a particular player was 98 miles per hour (mph) and the standard deviation of the serve
  speeds was 13 mph. Assume that the statistician also gave us the information that the
  distribution of serve speeds was mound-shaped and symmetric. Find the percentage of
  serves that were hit faster than 72 mph.

Q. 3

Many firms use on-the-job training to teach their employees computer programming.
 
  Suppose
  you work in the personnel department of a firm that just finished training a group of its
  employees to program, and you have been requested to review the performance of one of the
  trainees on the final test that was given to all trainees. The mean and standard deviation of the
  test scores are 84 and 5, respectively, and the distribution of scores is mound-shaped and
  symmetric. What percentage of test-takers scored better than a trainee who scored 69?
  A) approximately 95 B) approximately 100
  C) approximately 84 D) approximately 97.5

Q. 4

The school newspaper surveyed 100 commuter students and asked two questions. First,
  students were asked how many courses they were currently enrolled in. Second, the commuter
  students were asked to estimate how long it took them to drive to campus.
 
  Considering these
  two variables, number of courses would best be considered a _________ variable and drive time
  would be considered a _________ variable.
  A) continuous; discrete B) discrete; continuous
  C) continuous; continuous D) discrete; discrete

Q. 5

A recent survey was conducted to compare the cost of solar energy to the cost of gas or electric
  energy.
 
  Results of the survey revealed that the distribution of the amount of the monthly utility
  bill of a 3 -bedroom house using gas or electric energy had a mean of 104 and a standard
  deviation of 10. If the distribution can be considered mound-shaped and symmetric, what
  percentage of homes will have a monthly utility bill of more than 94?
  A) approximately 34 B) approximately 16
  C) approximately 95 D) approximately 84

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