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To test whether there is a difference in mean gas consumption.
Martin Motors has in stock three cars of the same make and model. The president would like to evaluate 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
17.0
19.4
20.7
Unleaded
19.2
20.2
21.2
Premium unleaded
20.3
18.6
20.4
Make use of normal probability distribution features of EXCEL to help determine the probability.
The weight of the first orange minus the weight of the second orange) is a random variable with standard deviation and individual outcomes are uncertain but happen in a predictable manner through time.
Create raw score predictions on criterion variable for persons with Z scores on predictor value of -2,-1,0,+1,+2.
What is the null and alternative hypothesis? What is your final conclusion?
Supposing that the entire $10,000 can be spent on tires (ignoring other costs), and that the true fraction that will fail is approximately .05, can NHTSA attain its goal while staying within the budget? Describe.
Consider the following stemplot. The mean of the data represented in this stemplot ?
To determine whether there exists mean difference among the groups:
Find the probability that he will answer at least 3 questions correctly.
If level of significance ( α ) is 0.005 in two-tail test, how large is non rejection region under curve of the t distribution?
A committee of three is selected at random from a set consisting of five Democrats, eight Republicans, and two Independents.
Two letters are chosen at random without replacement from word statistical. Determine the probability that both letters are s?
These can have a large impact on tenure and promotion decisions at many institutions. One particular instructor had ratings in 3 courses in one semester as given by the table below for the statement "The instructor is an excellent teacher.
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