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Draw a scatter diagram for the data in Table and determine by inspection if there is an approximate linear relationship between Yi and Xi .
Table Observations on Variables Y and X
n
Yi
Xi
1
20
2
28
3
40
5
4
45
37
6
52
7
54
8
43
9
65
10
56
Standard deviation is 35 hours. Is the company making acceptable light bulbs? Assume life spans are normally distributed.
You attempt a 50 item (n = 50) true-and-false exam. You did not study for the material and your attempt to answer any item is a guess, with a 50% chance that you will get any item correct. You need a score of 30 or better to pass the exam.
Suppose a card has just been inserted and the light is green - What is the probability that the door will actually open
Use the given data to find the best predicted value of the response variable.Eight pairs of data yield r = 0.708 and the regression equation y = 55.8 + 2.79x. Also, mean y = 71.125. What is the best predicted value of y for x = 5.7?
When it comes to advertising, "'tweens" are not ready for the hard line messages that advertisers often use to reach teenagers. The Geppeto Group study found that 78% of 'tweens understand and enjoy ads that are silly in nature.
Simulate this problem using the Monte Carlo process. Show the demand during lead time (DDLT) for 30 reorders and determine the expected demand during lead time.
in 1988 the mean expenses for college were 8000 with a standard deviation of 800. if 40 students were selected at
prove that the regression r2 is identical to the square of the correlation coefficient between two variables y and x.
Considering the four weights and assuming the weights are independent with a constant variance, obtain the least square weights of A and B.
No, there is not enough information to refuse hypothesis that proportion of male students who live on campus and proportion of female students who live on campus are same as the test value -1.65 is inside acceptance region (-1.96,1.96).
historical data suggests that a scientific journal accepts 10 of the manuscripts it receives rejects 50 of the
Wall Street securities firms paid out record year-end bonuses of $125,500 per employee for 2005 (Fortune, February 6, 2006). Suppose we would like to take a sample of employees at the Jones & Ryan securities firm to see whether the mean year-end b..
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