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Approximately 14 percent of the population of Arizona is 65 years or older. A random sample of five persons from this population is taken. The probability that less than 2 of the 5 are 65 years or older is:
A bank lobby has four video cameras positioned to view the entire lobby. Any one of the four is sufficient to monitor the lobby. Each camera functions independently and has a reliability of 0.90, that is, the probability of functioning is 0.90. A bank robbery takes place. Let a success (x) be defined as a camera functioning. Find the probability that the robbery was filmed at least by one camera.
The listed occupations of stockholders of a regional electric utility company included 9 percent who were homemakers. If six of these stockholders are randomly selected, what is the probability that:No stockholders are homemakers?
Estimate with 95% confidence the mean reduction in time it takes for someone who has taken the sleeping pill to fall asleep.
Use MegaStat's output for multiple regression to determine the multiple regression equation
Your regional manager is impressed with how you've employed spreadsheets to aid your small company in saving time and more accurately figuring out payroll amounts.
What are some conditions under which business decisions are made using subjective probability concepts? Could you please cite two examples of subjective probability.
Discuss at least three reasons why these predictions may not be accurate and offer three ways in which you can increase the likelihood of accurately predicting your customers' purchases.
A box contains four tickets, one marked with a star and the other three blank. One draw is made from this box at random.
A store asked 250 of its customers whether they were satisfied with the service or not. The responses were also classified according to the gender of the customers. We want to study whether there is a relationship between satisfaction and gender.
Use the table to determine whether the correlations are significant and how you would interpret the results. The correlation between speed and strength for 20 women is .567. Test these results at the .01 level using a one-tailed test.
In a batch of 8,000 clock radios 9% are defective. A sample of 15 clock radios is randomly selected without replacement from the 8,000 and tested.
As a sample size approaches infinity, how does the student's t distribution compare to the normal z distribution? When a researcher draws a sample from a normal distribution, what can one conclude about the sample distribution? Explain.
The researcher expects a 12-point treatment effect and plans to use a two-tailed hypothesis test with a = 0.05.
A firm engaged in manufacturing undergarments for gents employs 100 male and 144 female workers. The average production per day of a male worker is 60 items with a variance of 15 items, and that of a female workers is 65 items with a variance of 1..
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