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Question: Ski wax. Bjork Larsen was trying to decide whether to use a new racing wax for cross-country skis. He decided that the wax would be worth the price if he could average less than 55 seconds on a course he knew well, so he planned to test the wax by racing on the course 8 times.
a) Suppose that he eventually decides not to buy the wax, but it really would lower his average time to below 55 seconds. What kind of error would he have made?
b) His 8 race times were 56.3, 65.9, 50.5, 52.4, 46.5, 57.8, 52.2, and 43.2 seconds. Should he buy the wax? Explain.
Assume that the two groups come from populations with the same standard deviation. Test the claim that the mean score of women is equal to a mean score of men using a 0.02 significance level.
Examine the coefficient of determination and the adjusted coefficient of determination. Does it seem that either of the independent variables' addition.
(a) Apply the preflow-push algorithm with initial prices p1 = 0, and pi = N -i for i = 2,...,N. Use two different methods to choose the node for iteration: (1) Select the node with highest price, and (2) Select the node with lowest price. Explain ..
(a) Show that E [X(X - 1)] = µ(µ - 1) + σ 2 (b) Show that E [(X - c) 2 ] = (µ - c) 2 + σ 2 where c is an arbitrary constant.
How did both the goals and the tactics of the abolition movement change between 1800-1835?
an important feature of golf cart batteries is the number of minutes they will perform before needing to be recharged.
What is significance good for? Which of the following questions does a test of significance answer?
What is the probability that exactly three come up heads, if we saw that one came up tails?
The "Visit Europe" travel agency specializes in arranging trips to European cities. A customer, Judy, is interested in information on three cities:
Plot the data; does it appear that a simple linear regression will be a suitable model - Fit a simple linear regression; estimate a slope and intercept.
The trial failed to show significance. How many subjects would be required to detect the difference in proportions observed in the trial with 80% power?
What is the probability that he makes both shots?- What is the probability that he misses both shots?- What is the probability that he makes only one shot?
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