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A true-false test has 100 questions. Each correct answer gets 2 points, but 1 point is taken off for every other kind of answer (wrong, missing, ambiguous, etc). Suppose a student knows the correct answer to 45 of the questions, and for the remaining questions their number of correct answers is well-approximated by a Poisson(5) random variable. What is the student's approximate expected score on the test?
there are assumptions of multiple regression. one of them is the residuals are independent. this means that successive
Determine the completion time and standard deviation (σ) for project roundoff the standard deviation to the nearest hundredth: two decimal places.
1. In each of the following, identify the variable as discrete or not discrete.
The sample data set has a mean of 72 and a standard deviation of 8. What z-score corresponds to a score of 64.
A coin is tossed and an eight?-sided die numbered 1 through 8 is rolled.
Use a 0.10 significance level to test the claim that touch therapists use a method equivalent to random guesses. Do the results suggest that touch therapists
The amount of liquid dispensed varies according to a Normal distribution centered at the mean µ that is set in the machine.
A social psychologist studied the effect of height on perceived overall attractiveness. Students were recruited to come to a research laboratory in pairs.
A number x is formed by choosing six digits in order, each being a 9 or a 1 and equally likely. Describe the sample space and count the number of sample points it contains.
Show that Pearson's Chi-square statistic for testing Ho : 1 = 2 when there are k-categories reduces to Z^2 when k = 2, where Z = 2 sqrt(n)(p1-1/2) is the standard Z-test for testing Ho : 1 = 1=2
It is estimated that the competitor will submit a bid for the contract with probability 0.40. What is the probability of getting the deal?
Using a = .05, test to see if there has been a significant change in the proportions between 2002 and 2003. Please show working.
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