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Fuel Consumption and Cars
Jack Keef General Motors, an automobile dealer in Lincoln, Nebraska, advertised a $9.99 40-point safety checkup for any car and claimed that the service department would finish the job in less than 30 minutes. A local newspaper reporter selected a random sample of 58 customers who took advantage of the dealer's offer and found the sample mean time to complete the safety checkup was x‾ = 32.2 minutes. Assume σ = 5.7 and use a = 0.01.
a. Is there any evidence to suggest that the true mean time to complete the safety checkup is greater than 30 minutes?
b. Find the p value for the hypothesis test in part (a).
Why must a different t-test be used for matched-subjects and within-subjects designs than for randomized groups designs?
trip rate y1.54.02.12.64.82.02.43.31.92.0res. density x425251041520121422calibrate a regression model of the form of y
A state survey investigates either the proportion of 8percent for employees who commute by car to work is higher than it was five years ago.
The bus averaged 40 mph on the drive from Columbus to Athens but averaged 60 mph during the return trip. What was the average speed of the bus for the entire trip?
Can we infer from these data that there is a positive linear relationship between the value of the fund and the price of gold - Mutual funds minimize risk by diversifying investments they make.
classified ads in a newspaper offered 15 used cars of the same make and model for sale. a regression analysis was
he Bureau of Labor Statistics provides compensation information on and services for various positions. As of May 2008, the national average salary for an RN (registered nurse) was $65,130. Suppose the standard deviation is $9385. For a random sample ..
Test at 5% significance level null hypothesis that population mean is 40 hours against alternative that it is higher.
Find a 95% confidence interval for the population variance in caster angle. Assume normality.- Is there any evidence to suggest the population variance in caster angle is different from 0.40?
This problem related to Basic Statistics and it discuss about measuring students' intrinsic religious commitment with the introduction of faith based orientation course in a university
the table below shows the probability that x households are tuned to monday night football on abc when it is aired.
To maximize Andre's probability of landing on the net, how far away from the cannon should he position the nearest edge of the net?
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