Find evidence to show mean oil change time is different
Course:- Basic Statistics
Reference No.:- EM13149082

Assignment Help >> Basic Statistics

Jiffy lube advertises a 30 minute oil change. A sample of 35 customers showed a mean change time of 34 and a standard deviation of 8.3 minutes. Assuming normality, at the a = .05 level, is there enough evidence to show the mean oil change time is different?

Put your comment

Ask Question & Get Answers from Experts
Browse some more (Basic Statistics) Materials
Show that Ef [h(X)] can be computed in closed form and derive its value.- Construct a regular Monte Carlo approximation based on a normal N (0, 1)sample of size Nsim=10^3 and
Construct the indicated confidence interval for the difference between the two population means. Assume that the two samples are independent and that they have been randomly
A company has to replace a current production process. The current process is rapidly becoming unreliable whereas demand for the product is growing. The company must choose
Observing a sample of 35 morning customers at a convenience store, a researcher finds their average stay in the store is 3.0 minutes, with a standard deviation of 0.9 minute
Physical stores face increasing competition from online rivals. To compete, a campus bookstore collected data on sales of newly released trade books dis- played on shelving
Let X and Y be independent, uniformly distributed random variables on U(0,1). Define Z = X/(X-Y) . Find the cumulative distribution function and the probability density func
The random variable x is the number of houses sold by a realtor in a single month at the Sendsom's Real Estate office. Its probability distribution is as follows.
Parametric tests (such as t or ANOVA) differ from nonparametric tests (such as chi-square) primarily in terms of the assumptions they require and the data they use. Explain