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Question: A 2008 online survey by WSOC Channel 9 in Charlotte, North Carolina, asked people to choose their favorite Christmas song from a list of five choices. The following table shows the percentage of people who preferred each of the five songs.
Suppose that these percentages are true for the 2008 population of U.S. adults. Suppose that recently 600 randomly selected U.S. adults were asked the same question, and the following table shows the numbers of adults who preferred each of these five songs.
Test at the 2.5% significance level whether the distribution of results in the recent survey differs from the 2008 distribution reported by WSOC.
Construct a 95% confidence interval for the average amount its credit card customers spent on their first visit to the chain's new store in the mall assuming that the amount spent follows a normal distribution.
test the claim that the samples come from population with the same mean. a consumer magazine wants to compare the
suppose that the random variable y is an observation from a normal distribution with unknown meannbspmu and variance
Both intervals were calculated from the same sample data. The confidence level for one of these intervals is 90% and for the other is 99%. Which of the intervals has the 90% confidence level, and why?
The Empirical Rule One measure of intelligence is the Stanford Binet Intelligence Quotient (IQ). IQ scores have a bell-shaped distribution with a mean of 100 and a standard deviation of 15.
Has there been a significant decrease in the proportion of students who change their major after the first year in this program? Test at the .05 level of significance.
An urn contains θ black balls and N - θ white balls. A sample of n balls is to be selected without replacement. Let Y denote the number of black balls in the sample. Show that (N/n)Y is the method-of-moments estimator of θ.
You are trying to estimate the average amount a family spends on food during a year. In the past the standard deviation of the amount a family has spent on food
The single premium charged for this contract is the expected value plus 20%. What is the probability that the premium will cover the benefits?
Please summarrize, find the most important formulas, and explain a solve problem for each of this statictics topics: A. Simple regression and correlation B. Multiple regression and correlation
the capital asset pricing model is a financial model that assumes returns on a portfolio are normally distributed.
question a bank recorded the number of atm transactions made by its customers in one day. the number x of daily atm
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