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Speed. How does the speed at which you drive affect your fuel economy? To find out, researchers drove a compact car for 200 miles at speeds ranging from 35 to 75 miles per hour. From their data, they created the model Fuel Efficiency^ = 32 - 0.1 Speed and created this residual plot:
a) Interpret the slope of this line in context.
b) Explain why it's silly to attach any meaning to the y-intercept.
c) When this model predicts high Fuel Efficiency, what can you say about those predictions?
d) What Fuel Efficiency does the model predict when the car is driven at 50 mph?
e) What was the actual Fuel Efficiency when the car was driven at 45 mph?
f) Do you think there appears to be a strong association between Speed and Fuel Efficiency? Explain.
g) Do you think this is the appropriate model for that association? Explain.
It has been suggested that the number of particles emitted in a n interval may be adequately modelled by a Poisson distribution
Verify that the Mann-Whitney-Wilcoxon test rejects with α = 0.05. Estimate the probability that a randomly sampled participant receiving drug.
A statistics student wants to predict the annual salaries of employees at one large company. He wants to know if he can use the number of years that someone has worked at the company to predict his or her annual salary.
a may 2007 gallup poll found that only 11 of a random sample of 1003 adults approved of attempts to clone a human.find
Starting with the initial solution derived by the nw corner method identify the cell w/the best cost improvement index and the quantity that can be transferred to that cell.
the mental development index mdi of the bayley scales of infant development is a standardized measure used in
On average, how long must customers wait in line before service begins?
Testing for a linear correlation. Construct a scatter plot, find the value of the linear correlation coefficient r, and find the critical values of r from the table below using a=0.05.
The time spent(in days) waiting for a kidney transplant for people ages 35-49 can be approximated by the normal distribution, as shown in the figure to the right. (a) What waiting time represents the 99th percentile? (b) What waiting time represent..
A mean score on a standardized test is 50 with a standard deviation of 10. Answer the following
What are the null and alternative hypotheses to test if the new battery has longer life than the old battery? Draw a conclusion for the hypothesis test. Make sure you state your conclusion in the context of the problem.
How do you calculate a participant score if she was at the 67th percentile? I only have the standard deviation of the population and the mean. s = 27 x = 448.95
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