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You are hired to conduct a poll to determine how many people are satisfied with their phone service. You want 90% confidence that your estimated proportion is within 2.5 percentage points of the true proportion. A previous poll suggests that the proportion is 85%. How large must your sample be?
Translate this into a statistical hypothesis-testing problem and carry out the test. Be sure to give the null and alternative hypotheses, the value of the test statistic, the p-value, and your conclusions.
Estimate with 95% confidence the mean reduction in time it takes for someone who has taken the sleeping pill to fall asleep.
We are asked to test for independence between age (i.e., adult and teen) and drink preferences.
Verify that this is valid density function. Find out probability that weight is smaller than 24 ounces.
Although the two samples have an identica winning percentage,one is significant and the other is not. Explain why the two samples lead to different conclusions.
Find the probability that the age of a randomly selected CEO will be between 56-57 y/o. (round to 4th decimal) The probability a randomly selected CEO will be between 56-57 y/o is?
A political action committee decided to poll its membership to determine if they were in favor of a certain potential law, similar to gun control.
Devise a method for estimating and plotting Bayesian credible regions for the paramters, using your MCMC sample and compute LS estimators of a and b,
Determine regression line for predicting January temperature from latitude.
Use the sales forecaster's, predictions to describe a normal probability distribution that can be used to approximate the demand distribution.
From a population of cereal boxes marked "12 ounces," a sample of 81 boxes is selected and the contents of each box is weighed. You want to test whether the population mean is different from 12 ounces.
In general how is the magnitude of the standard error of estimate related to the value of correlation?
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