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The Restaurants McBurger says that the waiting time for customers is 3 minutes with a standard deviation of population 1 minute. The quality control department found in a sample of 50 clients that the average waiting time was 2.75 minutes. With a significance level of 0.05. Can conclude that the waiting time is less than 3 minutes?
Please provide details for I try to undertand the procedure.
A sample of 81 observations is taken from a normal population. The sample mean is 40, and the sample standard deviation is 5. Determine the 95 percent confidence interval for the population mean.
A company is interested in estimating μ, mean number of days of sick leave taken by its employees. The firm's statistician randomly selects 100 personnel files and notes the number of sick days taken by each employee.
It is known that in a sack of mixed bean seeds, 35% are yellow beans. Use the normal approximation to the binomial distribution to find the probability that in a sample of 400 beans there are
Compute the population attributable risk for smoking and lung cancer.
Propose a two sample z-test of a population mean and identify it as either an independent test or a dependent test.
An analysis of 1,000 cellular phone calls made from company phones at the offices of Kant, Taekitini, Moore, LLC reveals that the length of these calls is normally distributed, with m = 240 seconds and s = 40 seconds.
Using one proportion z test to find whether or not to support the claim - There is little evidence to reject H 0 , therefore they conclude the tvs are 20 pounds on average.
Why can not we just do several two sample tests like we did in the last week. In your own words explain briefly also tell us what these are and what did it mean.
At the .10 significance level you will test to determine if there has been an increase in selling time. Is this a 1 or 2 tail test?
The expected peak expiratory flow rate in adults is 300 with a standard deviation of 50. how many subjects should be enrolled to ensure 80% power to detect a difference of 15 liters per minute with a two-sided test and significance level of 0.05?
Compute the variance and standard deviation of the number that will arrive within two days.
Four wheel bearings have been replaced on a company car. The mechanic has selected 4 bearings from a large supply bin. The mechanic is unaware that 10 percent of the bearings fail within the first 100 miles.
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