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Martin Motors has in stock three cars of the same make and model. The president would like to compare the gas consumption of the three cars (labeled car A, car B, and car C) using four different types of gasoline. For each trial, a gallon of gasoline was added to an empty tank, and the car was driven until it ran out of gas. The following table shows the number of miles driven in each trial.
Distance (miles)
Types of Gasoline
Car A
Car B
Car C
Regular
22.4
20.8
21.5
Super regular
17
19.4
20.7
Unleaded
19.2
20.2
21.2
Premium unleaded
20.3
18.6
20.4
Using the .05 level of significance:
a) Is there a difference among types of gasoline?
b) Is there a difference in the cars?
In a regression model involving 30 observations, the following estimated regression equation was obtained:
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Pattern that most accurately represents mean, median and mode is?
A sample of 100 observations has a mean of 2.99 and a standard deviation s equal to 0.5 Conduct the following test of hypotheses about the corresponding population mean at a level of significance of α = 0.2
For a t distribution with 16 degrees of freedom, find the area, or probability, in each region.
The average number of putts per hole for each player and their average driving distance is used to predict their total winnings using the multiple regression model where the deviations εI are assumed to be independent and Normally distributed with..
To test whether the population standard deviation differ significantly using Chi-Square test.
What is the null and alternative hypothesis? What is your final conclusion?
The probability that the daily demand at this store is at least one and at most three is:
Carry out the global test of hypothesis to find out whether any of the regression coefficients are not equal to 0. Use.05 level of significance.
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