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Is the mean list price of a house lower if there are 3 bedrooms compared to 4 bedrooms? To answer this question we will construct a confidence interval and hypothesis test. The following information is from a random sample of 35 homes for sale in Milwaukee. The values are the list price in thousands of dollars for 19 houses that have 3 bedrooms and 16 houses that have 4 bedrooms.
A random variable Y is uniformly distributed over a range of 0 to 2*pi. Another random variable X is related to Y by X=cos(Y).
What is the expected shape of the distribution of the sample mean?
The length of a particular telemarketing phone call, x, has an exponential distribution with mean equal to 1.5 minutes.
A certain airplane has two alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is.02.
A hypothesis could be that the rate of teenage crime (13-19 year olds) 50 years ago in the United States was significantly lower than the rate of teenage crime is today.
She believes that the number of customers served on weekdays follows a normal distribution. Construct an 99% confidence interval of the average number of customers served on weekdays.
If the restaurant stocks 400 hamburgers and 150 chicken sandwiches for a given day, what is the probability that it will run out of hamburgers or chicken sandwiches (or both) that day? Assume that the demand for hamburgers and the demand for chick..
What does null hypothesis for repeated-measures hypothesis test state?
Given the linear correlation coefficient r and the sample size n, determine the critical values of r and use your finding to state whether or not the given r represents a significant linear correlation. Use a significance level of 0.05.
Using a significance level of .01 to test this hypothesis, what is your decision rule?
Twenty air samples were obtained and the carbon monoxide concentrations were recorded. the results in ppm (parts per million) were:
A 1990 census report revealed that the mean distance that U. S. citizens live from their birthplace is 50 miles and that the standard deviation is 15 miles. A random sample of 49 residents of your city yielded a mean distance of 56 miles.
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