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AA random sample of 16 students showed aht the variance in the number of hours they spend studying for a final exam was 25 hours^2.
a) Construct a 95% confidence interval for the population variance and standard deviation of hours spent studying. Assume the population of hours spent studying is normally distributed.
b) Test, at the 5% level of significance, whether the population standard deviation of hours spent studying is less than 10. Use the Critical value approach.
Test the significant difference between Chi-square for attributes
This model is fit to the data using the method of least squares using statistical software, and the following parameter estimates and their standard errors are obtained.
What factors might cause the company to order a larger or smaller amount than the EOQ?
At α = 0.01, is the degree of certainty independent of credits earned?
Given the following data, 1) how do you make Excel create a scatter diagram for you? 2) If you were to draw a line through the points, how straight would the line be?
In a normal distribution of 1,000 aptitude test scores, with a mean of 60 and a standard deviation of 8, how many scores fall:
Employ the frequency distribution, which describes the response of a survey of college students when asked, "How often do you wear a seat belt when riding in a car driven by someone else?"
We want to know if his support has decreased. In computing a test of hypothesis with , what is the estimate of the overall proportion?
It does not matter, when data are skewed mean and median are the same.
The mean return for a random sample of 33 mutual funds is 14.93 percent with a standard deviation of 9.57. Build a 95 percent confidence interval for mu, population mean.
Determine the probability of exactly one success given Poisson distribution with mean of 2.0.
After the presidential debates, a random sample of 1200 voters showed that 540 favored the Democratic candidate; 480 were in favor of the Republican candidate; 40 were in favor of the Independent candidate, and 140 were undecided. At a 1% level of..
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