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According to an article, 19% of the entire US population have high-speed access to the Internet. Random samples of size 200 are selected from the US population. The standard error of all the sample proportions is?
Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group Perform the chi-square test for a uniform distribution at α = .01
The resistances of carbon resistors of 1500 ohm nominal value are normally distributed with µ = 1500 and standard deviation = 200. What proportion of resistors is expected to have resistance greater than 1150 ohm?
If you did not know anything about standard deviation of population from which sample was taken, find out the 95% confidence interval for mean test score.
Determine the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect?
Make an interval estimate the population means score for the daycare children so that you are 95% confident that the true mean is in your interval.
Multiple choice questions based on regression - multiple coefficient of determination
At the .01 significance level, is there a relationship between job pressure and age?
Given that the student you choose is a senior, find out the probability of selecting a non-senior?
How much time should the employer allow employees to finish the job? (Round up to the nearest minute).
Determine the probability that sample mean is between 7.5 and 8 minutes?
The 90% confidence interval to estimate the true average difference in nationwide sales quantity before the ad campaign and after is (0.39, 16.64). Which of the following is the appropriate conclusion? The differences were calculated as (after ad ..
Basic Statistics problem
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