Question
In: Statistics and Probability
A survey was conducted to measure the number of hours per week adults in the United...
A survey was conducted to measure the number of hours per week adults in the United States spend on home computers. In the survey, the number of hours was normally distributed, with a mean of 7 hours and a standard deviation of 1 hour. A survey participant is randomly selected. Which of the following statements is true?
(a) The probability that the hours spent on the home computer by the participant are less than 4.5 hours per week is 0.9938.
(b) The probability that the hours spent on the home computer by the participant are between 4.5 and 9.5 hours per week is 0.0124.
(c) The probability that the hours spent on the home computer by the participant are more than 9.5 hours per week is 0.9938.
(d) 0.13% of the adults spend more than 4 hours per week on a home computer.
(e) If 43 adults in the United States are randomly selected, you would expect to say about 1 adult spend less than 5 hours per week on a home computer.
Solutions
orchestra answered 1 year agoRelated Solutions
A survey was conducted to measure the number of hours per week adults in the United...
A survey was conducted to measure the number of hours per week
adults in the United States spend on home computers. In the survey,
the number of hours was normally distributed, with a mean of 7
hours and a standard deviation of 1 hour. A survey participant is
randomly selected. Which of the following statements is true?
(a) The probability that the hours spent on the home computer by
the participant are less than 4.5 hours per week is 0.9938....
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A survey was conducted to determine whether hours of sleep per night are independent of age....
A survey was conducted to determine whether hours of sleep per
night are independent of age. A sample of individuals was asked to
indicate the number of hours of sleep per night with categorical
options: fewer than 6 hours, 6 to 6.9 hours, 7 to 7.9 hours, and 8
hours or more. Later in the survey, the individuals were asked to
indicate their age with categorical options: age 39 or younger and
age 40 or older. Sample data follow.
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A survey was conducted to determine whether hours of sleep per night are independent of age....
A survey was conducted to determine whether hours of sleep per
night are independent of age. A sample of individuals was asked to
indicate the number of hours of sleep per night with categorical
options: fewer than 6 hours, 6 to 6.9 hours, 7 to 7.9 hours, and 8
hours or more. Later in the survey, the individuals were asked to
indicate their age with categorical options: age 39 or younger and
age 40 or older. Sample data follow.
Hours...
A survey was conducted to determine whether hours of sleep per night are independent of age....
A survey was conducted to determine whether hours of sleep per
night are independent of age. A sample of individuals was asked to
indicate the number of hours of sleep per night with categorical
options: fewer than 6 hours, 6 to 6.9 hours, 7 to 7.9 hours, and 8
hours or more. Later in the survey, the individuals were asked to
indicate their age with categorical options: age 39 or younger and
age 40 or older. Sample data follow.
Hours...
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