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The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles. The standard deviation of the mileage is 5,000 miles. The Crosset Truck Company bought 48 tires and found that the mean mileage for their trucks is 59,500 miles. Is Crosset's experience different from that claimed by the manufacturer at the .05 significance level?
a) State the null hypothesis and the alternate hypothesis.
b) State the decision rule
c) Compute the value of the test statistic
d) What is your decision regarding Ho?
e) What is the p-value?
What are the two ways of testing a correlation coefficient for significance?
Calculate the Mean, Median, Mode, Range and Standard deviation of this sample. Show Calculations: Use any calculation method desired
Assume that p-value was 0.07, would you reject null hypothesis of equal mean rates for a Type- I error rate of 5%? (Circle one).
Multiple choice question based on multiple regression - The t value obtained from the table to test an individual parameter at the 5% level
Consider a random variable Y, and a constant theta such that (1/theta)Y is distributed exponentially. Derive the lower and upper bounds for a 90% confidence interval for theta (These will be a function of y). Noe that theta=1/lambda where lambda i..
What is the p-value and compute a 95% CI for the difference in means between the two groups?
State the values of the coefficient of correlation and coefficient of determination correct to three decimal places
The computed value of chi-square: Which of the following is true about the F distribution:
Suppose we have a ""black box" which on command can generate the value of a gamma random variable with parameters 1.5 and 1. Explain how we can use this black box to approximate
Determine the probability that: a) Exactly 3 will have this mild side effect.
Suppose that you want to compare the mean size of health care claims submitted by five groups of policyholders. Ten claims are randomly selected from amongst the existing claims for each of the five groups. The data is shown in the following table..
you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. Is this a one sample or two sample test?
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