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Chapter 7: Q 43. (page 464)
Students on diets Suppose that of college women have been on a diet
within the past months. A sample survey interviews an SRS of college women. What is the probability that or more of the women in the sample have been on a diet?
The probability is
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Lightning strikes The number of lightning strikes on a square kilometer of open ground in a year has mean 6 and standard deviation 2.4. The National Lightning Detection Network (NLDN) uses automatic sensors to watch for lightning in 1-square-kilometer plots of land. Find the probability that the total number of lightning strikes in a random sample of 50 square-kilometer plots of land is less than .
AP2.20 A grocery chain runs a prize game by giving each customer a ticket that may win a prize when the box is scratched off. Printed on the ticket is a dollar value ( \( 500, \) 100, \(25) or the statement "This ticket is not a winner." Monetary prizes can be redeemed for groceries at the store. Here is the probability distribution of the amount won on a randomly selected ticket:
Which of the following are the mean and standard deviation, respectively, of the winnings?
a. \) 15.00, \( 2900.00
b.\) 15.00, \( 53.85
c. \) 15.00, \( 26.93
d. \) 156.25,\( 53.85
e. \) 156.25, $ 26.93
The number of unbroken charcoal briquets in a 20-pound bag filled at the factory follows a Normal distribution with a mean of 450 briquets and a standard deviation of 20 briquets. The company expects that a certain number of the bags will be underfilled, so the company will replace for free the of bags that have too few briquets. What is
the minimum number of unbroken briquets the bag would have to contain for the company to avoid having to replace the bag for free?
a. 404
b. 411
c. 418
d. 425
e. 448
A statistic is an unbiased estimator of a parameter when
a. the statistic is calculated from a random sample.
b. in a single sample, the value of the statistic is equal to the value of the parameter.
c. in many samples, the values of the statistic are very close to the value of the
parameter.
d. in many samples, the values of the statistic are centered at the value of the parameter.
e. in many samples, the distribution of the statistic has a shape that is approximately
Normal.
Healthy Living From a large group of people who signed a card saying they intended to quit smoking, people were selected at random. It turned out that of these individuals had not smoked over the past months.
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