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1. In regression analysis, the residuals represent the: A. difference between the actual y values and their predicted values B. difference between the actual x values and their predicted values C. square root of the coefficient of determination D. change in y per unit change in x 2.In the simple linear regression model, the slope represents the: A. value of x when y = 0 B. change in y per unit change in x C. change in x per unit change in y D. value of y when x = 0 3.The coefficient of determination R2 measures the amount of: A. variation in y that is unexplained by variation in x B. variation in x that is unexplained by variation in y C. variation in y that is explained by variation in x D. variation in x that is explained by variation in y 4.If we are interested in determining whether two variables are linearly related, it is necessary to: A. perform the t-test of the coefficient of correlation ρ B. perform the t-test of the slope β1 C. either A or B since they are identical D. calculate the regression standard error s 5.Which of the following statistics and procedures can be used to determine whether a linear model should be employed? A. The standard error of estimate B. The t-test of the slope C. The coefficient of determination D. All of the above answers are correct 6.The regression standard error s is given by: A. SSE/(n-2) B. √SSE/(n-2) C. (√SSE/(n-2)) (whole thing is under √) D. SSE/√n-2 7.The symbol for the sample coefficient of correlation is: A. r B. ρ C. ρ2 D. r2 8. Given the least squares regression line yˆ=-2.48+1.63x, and a coefficient of determination of 0.81, the coefficient of correlation is: A. -0.85 B. 0.90 C. 0.85 D. -0.90
Test the claim that the actual percentage is 53%. Use a 0.10 significance level.
The sample mean X will be used to estimate. Determine the probability that the estimate will be off by less than .2 oz. Assume that the SD of the fills is .8 oz.
A small company that manufactures computers computer received 10 shipments of the chips in lots of 20 chips from the manufacturer. what is the probability that there will be 2 shipments with at least one defective chip?
A coin is tossed 100 times. The difference "number of heads - number of tails" is like the sum of 100 draws from one of the following boxes. which one, and why?
Support colour-coding on packaged food to indicate healthier options
A company operates four machines during three shifts each day. From production records, the data in the table below were collected.
Estimate the probability the store will gross over $850 a) Fewer than 5 out of 10 business days.
Given this eort, why would we want to unify the Bayesian and frequentist approaches? Why should we be interested in the prior that most frequently yields exact frequentist inference.
Let the following all-integer linear program: Max 1x1 + 1x2, s.t. 4x1 + 6x2
A study is conducted to determine if the traffic light patterns at a busy intersection need to be adjusted to help the flow of traffic. Data on the volume of traffic and the traffic patterns during different times of day are recorded.
Using a 1% level of significance, can the hypothesis that the distributions for the student's scores are identical be accepted?
Which of the following statements is not true of the null hypothesis? A) It is your theory B) It is what you would expect by chance alone C) Assumes things to be equal D) None of the above
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