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A researcher wishes to estimate the average amount of money a person spends on lottery ticket each month. A sample of 50 people who play the lottery found the mean to be $19 and standard deviation 6.8. Find 95% confidence interval for population mean.
City Opera, a local opera company, wishes to take a sample of its subscribers to learn the average number of years people have been subscribing.
The second segment goes from (1,1) to the point (x, 1). Sketch the distribution function, and determine what x has to be in order to be a legitimate density curve.
Suppose a random sample of size 21 is taken, and the variance of the sample is calculated to be 5.??a. What is (approximately) the probability that the population variance σ² is less than 4?
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.
1.you decide to test a friend for esp using a standard deck of 52 playing cards. such a deck contains 13 spades 13
the thickness of a flange on an aircraft component is uniformly distributed between 0.95 and 1.05 millimeters.a
The Cadet is a popular model of sport utility vehicle, known for its relatively high resale value. The bivariate data given below were taken from a sample of sixteen Cadets
Test the null hypothesis that these Arizona students scored the same as the North Dakota students. (238 North Dakota students had a mean of 525)What t-statistic do you obtain?
What is the probability that Bob will win that wonderful trip on the basis of his gasoline sales this month?
Iindicate all samples are approximately Normal with no outliers. Is the ANOVA appropriate?
ph in the water is 7 at the .05 significance level. Her alternative hypothesis is that the water does not have a pH of 7. For which p-value will she fail to reject the null hypothesis?
The event "the price of stock X has increased and the price of stock Y has not increased" may be written as??
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