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In the 2000 census, the so-called "long form" received by one of every six households contained 52 questions, ranging from your occupation and income all the way to whether you had a bathtub.
According to the U.S. Census Bureau, the mean completion time for the long form is 38 minutes. Assuming a standard deviation of 5 minutes and a simple random sample of 50 persons who filled out the long form, what is the probability that their average time for completion of the form was more than 45 minutes?
let x denote the amount of space occupied by an article placed in a 1-ft3 packing container. the pdf of the continuous
a restaurant claims that the standard deviation in the lenght of serving times is less than 2.9 minutes. a random
the sylvan pharmaceutical company makes tubes of antibacterial cream that are labeled as containing 4 ounces. in
Construct an ANOVA table to identify which of the effect estimates are statistically significant, Develop a model for the response based on the results of part and Construct an ANOVA table to see if the model developed suffers from lack of fit
the amount of paint required to paint a surface with an area of 50 m2 is normally distributed with mean 6 l and
a factory makes light bulbs. over a long period 4 of them are found to be faulty. a random sample of 100 light bulbs is
Internet is 13.4 hours per week, with the sample standard deviation of 6.8 hours. Determine the 95 percent confidence interval for mean time Wired subscribers spend on Internet.
Please describe and define what the chi-square analysis is, the conditions under which it is used, and how it compares to the Pearson Correlation.
A simple random sample of 6 recent graduates revealed the following information about their weekly incomes. What is the expected value of the average weekly income of all the recent graduates?
Assuming that all other variables are held constant describe how value of z is influenced by each of the following: If alpha level is changed from a = .05 to a = .01. What occurs to boundaries for the critical regions?
Find the 2σ and 3σ control limits for the average delivery time.- Explain a type I and type II error specifically in this context.
Effect of Screening Mammography on Breast-Cancer Incidence
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