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There are two Chevrolet dealers in Jamestown, New York. The mean monthly sales at Sharkey Chevy and Dave White Chevrolet are about the same. However, Tom Sharkey, the owner of Sharkey Chevy, believes his sales are more consistent. Below is the number of new cars sold at Sharkey in the last seven months and for the last eight months at Dave White. Do you agree with Mr. Sharkey? Use the .01 significance level."
Sharkey 98 78 54 57 68 64 70Dave White 75 81 81 30 82 46 58 101
Estimate the mean study time for the population of all students. What is the probability that the sample mean exceeds the population mean by more than 2 hours?
The average weight of adult men is 172 pounds with a standard deviation of 29 pounds. 30 men were asked their weight and the mean was calculated to be 181, test the hypothesis that the mean is not 172 pounds using alpha = .05.
What happens to the Maximum Error of Estimate as the sample size gets larger?
At α = 0.10, can the researcher conclude that alcohol consumption is related to sex? What kind of Chi-Square test is this?
X has a normal distribution with a mean of 80.0 and a standard deviation of 3.5. Find the following probabilities.
Sample of 25 rockets in his latest spaceship. He thinks they might weight less than the average rocket. The sample has on average 102 lbs with a standard deviation of 10 lbs. The average rocket weights 106 lbs.
Which of the following is true regarding ANOVA?
Suppose that you select a sample of 100 U.S. hospital patients. The probability is 90% that the sample percentage will be within what symmetrical limits of the population?
How large a sample size will need to be selected if we wish to have a 99% confidence interval with a margin for error of .10 oz?
A machine produces parts with lengths that are normally distributed with ? = 0.59. A sample of 19 parts has a mean length of 76.26.
a) Test whether there is a difference between attitudes in the 2 cities. Use a 95% alpha. b) What does your result say about attitude consistency across cities?
A hypothesis test is performed to test the claim that a population proportion is greater than 0.7. Find the probability of a type II error, β, given that the true value of the population proportion is 0.72. The sample size is 50 and the significan..
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