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Suggest other situations in which selection bias could be important. Discuss how one might get unbiased data in these situations.
Find out the expected winnings for a person who buys one ticket.
A sample of 3000 observations has a bell-shaped distribution with a mean of 82 and a standard deviation of 16. Using the empirical rule, find what percentage of the observations fall in the intervals x-bar ± 1s, x-bar ± 2s, and x-bar ± 3s
what type of sampling is being employed if the country is divided into economic classes and a sample is chosen from
In a sample of 855 bartenders, 48% heard complaints from persons about work. If the margin of error was 4.4%, what was the confidence level that was used?
For the given sample, X = (Outlook = 'Sunny', Temperature = 'Mild' , Humidity = 'High' , Windy = 'False') Please compute the conditional probability P(X|PLAY='No') * P(PLAY='No') . (* is the multiplication) Please give keep 3 digits after decim..
Satisfies each of the following statements. In each case, sketch a standard Normal curve and shade the area under the curve that is the answer to the question.
Assuming an approximately normal distribution of commuting times for those who work at the plant, construct and interpret the 90% and 95% confidence intervals for the mean.
Data for this and subsequent samples, each consisting of 25 square feet of canvas, are shown on the next page. Use an appropriate 3-sigma control chart in determining whether the process is in control.
find the following percentiles for the standard normal distribution. interpolate where appropriate. round your answers
channel 9 television in colville washington recently conducted a study of television news viewers. one item of interest
in china the probability of a baby being a boy is 0.5845. couples are allowed to have only one child. if relatives give
Write 1-2 paragraphs for each component of the model (days-to-repair; interval between breakdowns; lost revenue; putting it together).
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