IMG_4187

I. The coefficient 0.01476 in the equation is a) the parameter S,. b) the parameter g;. c) our estimate of the parameter ;. d) our estimate of the parameter f; II. Which of the following is the best interpretation of the slope? a) For each additional dollar offered to students, their scores increase by 0.01476 points, on average. b) For each additional dollar offered to students, their scores increase by 67.51 points, on average. c) For each 0.01476 additional dollars offered to students, their scores increase by one point, on average. d) For each 67.51 additional dollars offered to students, their scores increase by one point, on average. lll. Which of the following is the best interpretation of the intercept? a) The predicted score of a student who is offered no cash is 0.01476 points. b) The predicted score of a student who is offered no cash is 67.51 points. c) The amount of cash offered to a student who scores a zero is, on average, 0.01476 dollars. d) The amount of cash offered to a student who scores a zero is, on average, 67.51 dollars. e) None of the above; it is not appropriate to interpret the intercept in this situation. IV. Calculate the predicted test score of a student who is offered a cash incentive of $200. a) 64.56 b) 70.46 c) 73.41 d) 76.37 e) 82.27 V. The p-value for the Hypothesis test for g, was 0.0952, so there is evidence that scores on the test depend on the size of the cash incentive. (use a@ = 5%) a) not enough b) pretty strong C) some d) no VI. Calculate the value of the t test statistic for testing whether score depends on cash incentive. a) 0.600 b) 1.67 c) 2.79 d) 4.10 e) 9.59 VII. Describe the type of variables (cash, score) that you observe from the scatterplot: a) (discrete,discrete) b) (discrete, continuous) ¢) (continuous, continuous) d) (continuous, discrete) 24. To test the hypothesis that eating fish makes one smarter, a random sample of 12 persons take a fish oil supplement for one year and then are given an IQ test. Here are the results: 116 111 101 120 99 94 106 115 107 101 110 92. Test using the following hypotheses, report the test statistic with the P-value, then summarize your conclusion. Ho: p = 100 Ha: p > 100. Use a = 0.05.