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1 The data below indicate the state gas tax in cents per gallon and the fuel use per registered vehicle (in gallons). Is there a significant relationship between these two variables?
Tax 21.5 23 18 24.5 26.4 19
Usage 1062 631 920 686 736 684
2 In a study on speed and braking distance, researchers looked for a method to estimate how fast a person was traveling before an accident by measuring the length of the skid marks. An area that was focused on in the study was the distance required to completely stop a vehicle at various speeds. Use the following table to find the linear regression equation.
MPH Braking distance (feet)
20 2030 4540 8150 13360 205 80 411
3 Seatwork
Use the data in the table below to find the coefficient of determination and interpret the result.
Height 70 72 75 76 85 78 77 82
Trunk diameter 8.3 10.5 11.0 11.4 14.9 14 16.3 15.8
A standard IQ test has mean of 98 and a standard deviation of 16. We want to be 99% certain that we are 8 IQ points of the true mean. Determine the sample size.
Describe how you would collect the data in a retrospective observational study.- Describe how you would collect the data in a prospective observational study.
The company polled a random sample of bathers on beaches from Maine to California and Hawaii, and found that out of the sample of 3,850 users of suntan lotions, 1,367 were users of Bain de Soleil. Do you reject the null hypothesis? What is the p-v..
What is meant by the sensitivity of a dependent measure? What are ceiling and floor effects?- What are demand characteristics? Describe ways to minimize demand characteristics.
Suppose you need to sample the concentration of a chemical in a production process that goes on continuously 24 hours per day, 7 days per week.
question one.a the probability that a bomber sets a target on a bombing mission is 0.70 three bombers are sent to bomb
Joe DiMaggio. Yankee center fielder Joe DiMaggio was paid $32,000 in 1940 and $100,000 in 1950. Express his 1940 salary in 1950 dollars.
Let X1 and X2 be the numbers obtained on two of a fair die, Let Y1 = max (X1, X2) Y2 = min(X1, X2). Display joint distribution tables for a) (X1, X2).
A pair of dice is rolled. The sum of the faces on top is observed. What are the expectation, variance, and standard deviation of the observed sum? The Expectation and Variance Template attached to the main posting is optional and recommended.
What percent of the twelfth-grade students who drive said that they do not always wear a seatbelt when they drive?- Find the percentage in each of the five response categories.
the hawks are currently winning 0.55 of their games. there are 5 games in the next two weeks. what is the probability
A nurse is interested in whether there is a relationship between daily levels of stress and likelihood of a heart attack.
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