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Suppose 80% of the college football fans root for the home team. If 400 fans who attended a college football game last week are selected at random, what is the probability that more than 331 of them rooted for the home team?
Write down the probability distribution of X, the insurance company's annual gain from such a policy (i.e., the amount of money made by the insurance company from such a policy).
A manufacturer of athletic footwear claims that the mean useful lifetime of his product will exceed 50 hours. A random sample of 36 pairs of shoes leads to the following sample results, in terms of useful life: x = 52.3 hours and s = 9.6 hours.
the following sales data are available for 2003-2008.year demand2003 72004 122005 142006 202007 162008 25determine a
What is the probability that a sample mean will be within plus-or-minus two of the population mean for each of the following sample sizes?
If a member of this senior class is selected at random, find the probability that the student a) smokes but does not drink alcoholic beverages; b) eats between meals and drinks alcoholic beverages but does not smoke; c) neither smokes nor eats bet..
How many cars must be randomly selected and tested in order to estimate the mean braking distance of registered cars in the US to give a 99% confidence that the sample mean is within 2 ft of the population means. The population standard deviat..
Construct a frequency distribution that has 5 classes, and draw:
At the .05 significance level, is there a difference in the mean number of miles traveled per month between Cincinnati and Pittsburgh employees? Use the five-step hypothesis-testing procedure.
How many departments would they need to survey to achieve this level of accuracy with 95% confidence?
What is the difference between a point estimate and an interval estimate? How would you calculate a confidence interval with a z test?
The data given shows daily sales at the petrol station. Compute Karl Pearson's co -efficient of skewness. Quantity sold (in litres) and No. of days. are given.
Find the probability of committing a type I error.
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