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Digital camcorder repair service has set the goal not to exceed average of 5 working days from time unit is brought in to time repairs are completed. Random sample of 12 repair records showed following repair (in days) 9,2,5,1,5,4,7,5,11,3,7,2.
Ho: u< or equal to 5 days versus H1: u> 5 days(a) Should you reject the Ho if t > 1.796?(b) Compute the t-value(c) Should null hypothesis be rejected?(d) Is average repair time longer than 5 days?(e) At a=.05 is the goal being met?
According to the Sleep Foundation, the average night's sleep is 6.8 hours. Assume the standard deviation is 0.6 hours and the probability distribution is normal. a. What is the probability that a randomly selected person sleeps more than 8 hours?
Two airlines fly to Memphis. according to airport data for the past year, wings airlines planes arrived on time 330 times and were late 60 times. Global airlines planes arrived on time 430 times and were late 50 times.
Depends on the satellite information illustrate what is the expected number µ of real forest fires on the Seward Peninsula.
A company's headquarters is located in downtown Chicago. The company is interested to know the mean driving time of its employees if they require their employees to start working at 6:00 am. Fifty employees are randomly sampled over four weeks and..
Critically discuss the assumptions, if any, regarding a Chi-square test? What are the assumptions to apply linear regression?
The engineer in a widget factory wants to test out a new form of raw materials. So a batch of widgets are made in the old manner as a control group and then a batch are made with the new materials as a comparison.
Find the 95% confidence interval of the mean score for all golfers if this is a sample of 110 golfers instead of a sample of 93.
In order to estimate the difference between the average hourly wages of employees of two branches of a department store, the following data have been gathered.
It takes between 6 to 7.5 hours to drive from Panama City to Boquete, and the drive time is uniformly distributed.
Detremine the mean, standard deviation, and variance for this frequency distribution.
Construct a 95% confidence interval for the average amount its credit card customers spent on their first visit to the chain's new store in the mall assuming that the amount spent follows a normal distribution.
How many students should be surveyed to estimate the mean score within 25 points with 90% confidence?
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