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Polls showed the two main candidates in the 2004 presidential election were nearly tied on the day before the election. To predict the winner a newspaper would like to have a poll that has margin of error less than 1%. Roughly how large a sample would be needed for such a poll?
Using one mean Z test to test whether or not to support the claim - Is there evidence that the average hours is below 6? Describe.
Is there a difference in the number of points students earned on their educational statistics pretests and posttests?
To develop 3-month and 2-month moving average for the time series.The following data represents demand for company ABC's products for the last 10 months.
The following regression equation and correlation coefficient were calculated using minitab for the bivariate data age of men and their weight.
If the manager decides to spend $3000 on advertising, based on the simple linear regression results given above, what would the estimated sales be?
In a study about postage tariffs and revenue, the European Economic Community wanted to look at the relationship between the number of postal employees in a country and the amount of domestic mail that was processed. They collected data for six di..
At 0.05 level of significance, is there evidence of noteworthy difference in variation in sales among different aisle locations?
A coin is tossed 20 times. A person, who claims to have ESP is asked to predict the outcome of each flip in advance. She predicts correctly on 14 tosses.
Let p1 = 100 and n1 = 500; and p2 = 200 with n2 = 500. Test whether there is a statistical difference between the two proportions at the 5% significance level.
If the sample size (n) is large, and the sample is a random sample, then the distribution of the sample mean x-bar is approximately a:
Findout the 98% confidence interval for true mean. Findout a 98% confidence interval for the cigarette tax in all 50 states.
Suppose that the National Labor Relations Board (NLRB) wishes to estimate the average hourly wage rate for a certain classification of skilled workers. It wishes to be 95% certain to get an estimate of sample mean within 0.05 of the truth.
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