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Question: Roller coaster. People who responded to a July 2004 Discovery Channel poll named the 10 best roller coasters in the United States. A table in the last chapter's exercises shows the length of the initial drop (in feet) and the duration of the ride (in seconds). A regression to predict Duration from Drop has R2 = 12.4%.
a) What are the variables and units in this regression?
b) What units does the slope have?
c) Do you think the slope is positive or negative? Explain.
explain the parts of a decision tree.what are some benefits of using decision trees?in what ways can decision trees be
The best we can do is to use one-way ANOVA and make sure to randomize the treatments to the experiment units. Why is such a randomization important?
A chain of fast-food restaurants offers an instant-winner promotion. Drink cups and packages of French fries come with peel-off coupons. According to the promotion, 1 in 20 packages is a winner.
Given the data shown here, determine and interpret the Spearman coefficient of rank correlation. At the 0.02 level, does rs differ significantly from 0?
We wish to compare two maintenance policies for the airplanes of a certain airline company. In the case of policy A(respectively, B), the airplanes arrive to the maintenance shop according to a Poisson process with rate λA = 1
Given figure is a scatterplot of the number of spams per day versus the number of bots for 10 botnets. Find the correlation between these two variables. Then bootstrap the correlation for these data.
the over $50,000 income range did not own a dishwasher. If one household is randomly selected from each income group. Determine the probability that neither household will own a dishwasher.
Is there sufficient evidence to support the claim that the diet is effective? Explain. What is the mean weight loss? Is it large enough to make the diet practical for someone wanting to lose weight?
What do you feel was the most important concept that you learned in this course? And why? Please illustrate with an example.
The world incidence of (frequency of world population having) diabetes is 5%. If 20 persons are chosen at random, what is the probability that no more than 3 have the disease
An experiment is conducted to test the claim that James Bond can taste the difference between a Martini that is shaken and one that is stirred. What is the null hypothesis?
Let J3 = K3 - K2, the number of transmissions of message 3; J2 = K2 - K1, the number of transmissions of message 2; and J1 = K1, the number of transmissions of message 1. Derive a formula for PJ(j), the PMF of the number of transmissions of individ..
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