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A sample of 400 orders for take-out food at a local pizzeria found that the average cost of an order was $25 with s=$18.
(a) Find the margin of error, if we use a 95% confidence interval, for the average cost of an order.
(b) Interpret for management the margin of error.
(c) If we need to be 99% confident, does the confidence interval become wider or narrower?
(d) Find the 99% confidence interval.
Rob rales is preparing a report that his employer will eventually deliver to the FFA. First, the report must be approved by both of his two supervisors. Each of these supervisors acts independently in the review of these reports. Supervisor A ..
An urn contains white and pink balls. Six 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 balls drawn from the urn are white? ..
Analyze the processed data in Statistical survey.
1. for commercial flights in 2009 approximately 90 arrived on time within 15 minutes of scheduled arrival time.
Determine and interpret the sensitivity of mammography.
When performing a hypothesis test, you must make an assumption inorder to perform it. Assume that the hypothesis you are testing (the nullhypothesis) is true. This assumption allows you to calculate the probability ofthe test results. You then use th..
The vast majority of the world uses
The mean weekly income of residents of one state is $570. A random sample of 12 residents of one small town in the state yielded the following weekly income in dollars
Develop a model for the Total Cost to put on the seminar. Let x represent the number of students who enroll in the seminar - develop a model for the Total Profit if x students enroll in the seminar.
Explain the difference between a normal Distribution and a binomial distribution. How do we know which one to use?
Estimate the difference between the proportion of the population of low birth weight children and the proportion of the population of normal birth weight children who graduate from high school. Report a standard error for your estimate.
A particular district of your nation had a higher incidence rate for polio last year compared to the rest of the country. That region has been traditionally been resistant to vaccination efforts. You have commissioned a case-control study for the vil..
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