A machine produces 3 inch nails a sample of 100 nails is
A machine produces 3 inch nails. A sample of 100 nails is selected, and it is found that 25 are shorter than 3 inches. Find the 95% confidence interval on the proportion of all such nails that are shorter than 3 inches.
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In a national wide survey a researcher expects 30 percent of the population will agree with an value statement. He wishes to have less than 2% error and 95% confident. What sample size is needed?
A researcher expects the population proportion of the Cubs Fans in Chicago to be 80%. Error of less than 5% confident of an estimate to be made from a mail survey. What is the sample size required?
From your own readings, study, and personal experience, contrast the living conditions of people living in post-industrial countries (e.g., the United States) with those in pre-industrial or emerging countries.
Survey to determine what proportion of new car buyers continue to have their car serviced at the dealership after warranty ends. Estimates 30% of customer do so.
When estimating the mean of a population, how large must the sample be in order that the 95% error margin is 1/8 the standard deviation?
I want to know whether the StdError of the fitted score (SEYhat) can be legitimately interpreted normally for N=1 subject, with only one plotted Y score for each X value.
How did the process of industrialization affect the nature of the industrial relationship between workers and their employers?
Assess the impact of an event on a population. I ran a survey before the event and then I ran the survey after the event. The collected responses matched between prior to the event and after. I used paired t-test to determine if the event had a posit
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