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It is generally recommended that adults sleep at least 8 hours each night. One of the authors recently asked some of her students (undergraduate and graduate students at Harvard) how many hours each had slept the previous night, curious as to whether her students are getting enough sleep. The data are displayed in Figure 1. The 12 students sampled averaged 6.2 hours of sleep with a standard deviation of 1.70 hours. Assuming this sample is representative of all her students, and assuming students need at least 8 hours of sleep a night, does this provide evidence that, on average, her students are not getting enough sleep?
(a) State null and alternative hypotheses
(b) Give the test statistic and the p-value and state the conclusion of the test.
Develop a spreadsheet model that could be used to assist a user with retirement planning.
Determine the probability that Mexican American male in the 20 -74 age range has serum cholesterol value greater than 240 mg/dl.
An urn contains 8 black and 9 green balls. Five balls are randomly drawn from the urn in succession, with replacement.That is, after each draw, the selected ball is returned to the urn. What is the probability that all 5 balls drawn from the ur..
Using a level of significance of .05, is there evidence that the dual degree students are receiving lower grades? Explain.
A company uses triple time estimates to determine expected completion time for all of their projects. If they determined the expected time to complete a project is 25 weeks with a variance of of 9 weeks
etting the significance level at a very high cutoff (such as 15%) increases chances of what type of error? Why do Type II errors concern scientists? Why have confidence levels of significance been set at 5% and 1%?
Do you benefit by using a cum sum chart rather than a control chart?
Explain the distribution of mean of samples of size 15.
carbon dioxide gas enters a well-insulated diffuser at 20 psia 500 r with a velocity of 800 fts through a flow area of
Arrivals at a telephone booth are considered to be poison, with an average time of 10 minutes between successive arrivals. The length of a phone call is distributes exponentially with mean3 minutes. The probability that an arrival does not have to..
Find the value of t α/2 and n = 18 for the 99% confidence interval .B. find the value of t α/2 and n = 15 for the 98% confidence interval.
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
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