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Based on the custom "rule-of-thumb" for estimating the standard deviation, if the range of prices for a product sold in Kansas City is between $99 and $349, an estimate of the standard deviation of the prices would be about:
The average score on math portion of SAT was 516 in 2002. Assume that the math score of all students taking the SAT 2002 were normally distributed with a mean of 516 and a standard deviation of 90.
a) What type of research uses numeric measurement data? b) What type of research uses a research hypothesis? c) What type of research does not use statistical data analysis?
Find the value of Z-score- standard normal distribution.Find out a value of the standard normal random variable z, call it z0.
At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales?
To test whether there is a significant mean difference among the three.
Suppose that the thermometer readings are normally distributed with mean of 0° C and a standard deviation of 1.00° C. A thermometer is randomly selected and tested.
If a time series is stationary without a linear trend or the seasonal component, which of the following forecasting methods may be suitable.
Assume gasoline prices for a region are normally distributed. do the data you obtain provide enough evidence to reject the claim? use 1% level of significance.
Among 500 freshmen pursuing a business degree at a university, 347 are enrolled in an economics course, 204 are enrolled in a mathematics course, and 160 are enrolled in both an economics and a mathematics course.
a) Find the marginal density of Y. b) Find E(X) HINT: What is E (X|Y=y) ?
This test result prompts a state administrator to declare that the mean score for the sate's eighth graders on the examination is more than 275. at a=.04, is there enough evidence to support the claim.
would this prove that they are exceeding their goal, using α = .025?
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