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A jar contains 12 marbles, 5 of which are blue and 7 of which are red. If 4 marbles are chosen at random and without replacement, what is the probability of selecting 3 blue ones and 1 red one?
a. 5C3 x 7C1/12C4b. 5P3 x 7P1/12P4c. 5C2 x 7P2/12d. Answer not listed
You've two separate sets of data. From one set you calculate the standard error to be 500. From the other set, the standard error was 5.
What sample size would be required to obtain the error of ±10 square millimeters with 99 percent confidence?
Given that a Brand A battery just failed, what is the expected value of the time we wait until the next Brand B failure?"
Which of the following is NOT true regarding the normal probability distribution.
A population of data from a paper supply company is known to have a mean weight of 55 ounces per ream and a population standard deviation of 5 ounces. The population is known to be bell shaped and symmetrical. Which of the following statements is ..
Student team examined parked cars in 4 different suburban shopping malls. One hundred vehicles were studied in each location. Research question : At α = . 05.
The difference between expected payoff under certainity and expected value of the best act without certainity is the expected:
Compute the population attributable risk for smoking and lung cancer.
Gallup Polls When Gallup and other polling organizations conduct polls, they typically contact subjects by telephone. In recent years, many subjects refuse to cooperate with the poll.
A study of the time spent shopping in a supermar- ket for a market basket of 20 specific items showed an approximately uniform distribution between 20 minutes and 40 minutes. What is the probability that the shopping time will be:
Research has shown that the people often see a correlation between two events when one does not really exist. Why do you think this happens?
Fitting of simple linear regression equation - A researcher wishes to determine whether a person's age is related to the number of hours he or she jogs per week.
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