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A 15-minute Oil and Lube service claims that their average service time is no more than 15 minutes. A random sample of 35 service times was collected, and the sample mean was found to be 16.2 minutes, with a sample standard deviation of 3.5 minutes. Is there evidence to support, or to reject the claim at the alpha = 0.05 level? Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results.
First-order regression model was fit to data. Part of printout follows?
A random sample of 15 college graduates revealed that they worked an average of 5.3 years on the job before being promoted. The sample standard deviation was 1.2 years. Using the 0.95 degree of confidence, what is the confidence interval for the p..
An experiment consists of making 80 telephone calls in order to sell a particular insurance policy.
The number of hurricanes that are formed during each hurricane season can be modeled using the Poisson probability distribution. History suggests that the average if number of hurricanes formed during a year is 6.0 hurricanes.
Find the probability that in a given year,a) Exactly one major hurricane will strike the U.S. mainland
If you randomly assign participants to groups, can you suppose the groups are equivalent at the beginning of the study?
You are conducting an evaluation of services at a social service agency. One of the evaluation issues is finding out whether male clients rate the quality of casework services as highly as do female clients.
A stock price is currently $100. Over each of the next two three-month periods, it is expected to increase by 10% or fall by 10%. Consider a six-month European call option with a strike price of $105.
Assume that a single radar unit used to detect incoming missiles has a probability of 0.90 of correctly detecting an incoming missile attack.
What is the most controllable method of increasing the precision (narrowing) of the confidence interval? What percentage of times will the mean (population proportion) not be found within the confidence interval?
In exercise identify (a) sample and (b) population. Also, find whether sample is likely to be representative of population.
one class of 40 students complain that they were harshly graded in the examination as l0 students received A or B ; 17 received a C ; and the rest received a D or lower. QUESTION: Is the class's complain about harsher grading justified? ( use a : 0..
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