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Draw some pictures. Consider the binomial setting with n = 50 and p = 0.4.
(a) The sample proportion p^ will have a distribution that is approximately Normal. Give the mean and the standard deviation of this Normal distribution.
(b) Draw a sketch of this Normal distribution. Mark the location of the mean.
(c) Find a value p* for which the probability is 95% that p^ will be between ±p*. Mark these two values on your sketch.
an index of two store items for 2007 based on 2005 is to be constructed. the information for the prices and quantities
Describe a recent study where data was gathered. If possible, explain whether it is a qualitative or quantitative study, and whether the data is discrete or continuous. What type of graph would you use to describe the data and why?
consider throwing 2 usual dice. in each play we observe the number of dots that stay on top sum the returned result
-Explain at least two (2) possible reasons for the differences between the results of exploration and trade by the Chinese and by the European states.
Downhill Ski Resort in Colorado has accumulated information from records of the past 30 winters regarding the measurable snowfall. This information is as follows:
A document claims that 56.5% of UVA undergraduates are female. To test this claim, a random sample of 240 UVA undergraduates was selected. In this sample, 58.8% were female. Is there sufficient evidence to conclude that the document's claim is ..
There is no proof the new policy is more effective, but we cannot finish the policy has no effect on smog. Interpretation of P-value for the given context.
What are the expected value and the standard deviation of the sample proportion P^ if the true population proportion is 0.2 and the sample size is n = 90?
At the 0.05 level in a one-tail test, is this sample finding significantly lower than the 49% reported by Opinion Research? Determine and interpret the p-value for the test.
What is a hypothesis test? Why do we need to use them to make decisions about relating sample results to the population; why can't we just make our decisions by the sample value?
A touring company has the following box office takings for the recent month.
Construct a 95% confidence interval for the proportion of votes that Jefferson will receive, and make a conclusion about Jefferson winning election.
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