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A random sample of 6 music majors playing song S counted the number of mistakes each made. Then these musicians played song G and the mistakes were tallied. In between playing the two songs, the students practiced a more difficult song. Is there evidence that practicing a difficult song in between resulted in less mistakes?
Student 1 2 3 4 5 6
Mistakes(S) 9 10 6 9 5 8
Mistakes(G) 4 5 6 6 6 5
Difference 5 5 0 3 -1 3
As the Marketing Director of Harley-Davidson, you need to determine what your customers would like in the next model. You put a survey on the Harley Web site. Is this a good frame from which to select your sample? Explain.
Use a P-value to test the claim about the population mean using the given sample statistics. State your decision for a=0.05. Claim: mean does not = 230
A study was conducted to estimate the mean amount spent on birthday gifts for a typical family having two children. A sample of 150 was taken, and the mean amount spent was $225.
Find the probability that a sample of 16 tires will have an average tire life of more than 52000 miles, give that the mean tire life is 50000miles and the standard Deviation is 8489.13.
Create a hypothesis test which will investigate the variances. Label all steps for your test and show and label each step of the test procedure at a .1 level of significance.
the speed of a runner increased steadily during the first three seconds of a race. her speed at half-second intervals
Do you think an F-ratio of 1 would lead you to conclude that there is no treatment effect? Why? Justify your answers with examples.
a group of 49 randomly selected students has a mean age of 22.4 years with a standard deviation of 3.8. construct a 98
the amount of gasoline sold daily at a service station is a value of x of a random variable x that is approximately
You are working on an analysis of your company's current cost structure reviewing the various fixed and variable costs within your firm. Your objective is to maximize your firms profit.
Find the test statistic value for two mean tests using equal variance formula.
Random variable with mean of 10 and standard deviation of 2.4. Over the course of the next year, what is the probability that you average more than 11 games a month?
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