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On a multiple choice test of 13 questions, each question has four (4) possible answers, one of which is correct. For students who guess at all answers, find the following, if X is the number of correct guesses. (i). The mean of the random variable X. (ii). The standard deviation of the random variable X. (b).In a city the probability that a person will pass his or her driving test the first attempt is 0.66.Four people are selected at random from among those taking their driving test for the first time. Determine the following. (i). The probability that exactly one person passed the test. (ii). The probability that exactly two persons passed the test. (iii) The probability that at least two persons passed the test. (iv).The probability that at least three persons passed the test.
There is significant evidence at alpha=0.05 t o show that the populations of endotoxin levels in children living varying distances from operating farms are not equal.
A company selects five of the machines at random, thinking all are in working condition. What is the probability that all five of the machines are nondefective?
give an example of a researchstatistic study that you encountered this week in your life outside of this course. this
In a poll of 400 randomly selected voters, 204 of them support the strategist's candidate. At = .05, is the political strategist's claim warranted?
Take any number, square it, and add 6, multiply by the original number. Now add 5 to that. Now divide this by the original number plus 1. Now subtract your original number and you should get 5.
estimating the sample standard deviation using normal score.for a sample with a mean of m 85 a score of x 90
Perform a posthoc test that is suitable if we assume that group 7 is a control group and that the other are different treatment groups and that we are only interested in finding significant treatments, not to compare them.
averaging 204 pins with a standard deviation of 24.9, can one conclude at a level of significance of .01 that the new ball has improved his game?
A sample of 4 different calculators is randomly selected from a group containing 42 that are defective and 27 that have no defects. what is the probability that all four of the calculators selected are defective?
What is the probability that in January of 2003 a randomly selected worker spent fewer than 50 hours per month logged on to the Internet?
Discuss the assumptions of this model. Specifically, how does each variable affect demand? How do the variables influence each other? What limitations might this model have? How can it be improved?
Multiple regression and correlation analysis provides a means for examining the relationship between of two (2) or more independent variables and the dependent variable.
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