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An election will be held next week and, by polling a sample of the voting population, we are trying to predict whether the Republican or Democratic candidate will prevail. Which of the following methods of selection is likely to yield a representative sample?
(a) Poll all people of voting age attending a college basketball game.
(b) Poll all people of voting age leaving a fancy midtown restaurant.
(c) Obtain a copy of the voter registration list, randomly choose 100 names, and question them.
(d) Use the results of a television call-in poll, in which the station asked its listeners to call in and name their choice.
(e) Choose names from the telephone directory and call these people.
The amount of corn chips dispensed into a 10 ounce bag by the dispensing machine has been identified at possessing a normal distribution with a mean of 10.5 ounces and a standard deviation of .2 ounces.
Draw the complete decision tree and determine whether the product should be launched or not.
a researcher asks if people score higher or lower on a questionnaire measuring their emotional well-being when they are
Answer the following questions what is the probabilty that a random sample of 20 time interval between eruptions has a mean longer than 95 minutes?
Blood type AB is found in only 3% of the population†. If 260 people are chosen at random, find the probability of the following. (Round your answers to four decimal places.)
Suppose the company that has produced "Get Slim X" now produces an even better diet pill. This new and improved version is called "Get Super Slim X."
anna sheehan is the manager of the spend wise supermarket chain. she would like to be able to predict paperback book
The value of the test statistic
suppose that the random variable x is the time taken by a garage to service a car. these times are distributed between
Suppose n progeny are to be examined, and let P^ be the sample proportion of purple-owered plants. It might happen, by chance, P^ that would be closer to 1/2 than to 9/16. Find the probability that this misleading event would occur if:
question a survey by accountemps asked a sample of 200 executives to provide data on the numberof minutes per day
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