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IQ data is thought to be normally distributed with a mean of 100 and a standard deviation of 15. Using the emperical rule, what is the IQ range we would expect approximately 95% of the population to be?
A metropolitan school system consists of three school districts-norths, south, central. The north district contains 25% of all students, the south district contains 40%, and the central district contains 35%.
Thirty-five percent of the Democrats and 70% of the Republicans favor the bill. The bill needs a simple majority to pass. Using a probability tree, determine the probability that the bill will pass.
the amount to fill in a half-liter 500 ml soft drink bottle is normally distributed. the process has a standard
The mean numbers of trials to learn maze for the group with the colrful wallpaper is 11. What is the standard deviation of the distribution of means?
Graph the distribution using a histogram. Calculate the mean and standard deviation.
experiments have shown that when a clean tungsten surface is heated by laser irradiation using a focused ruby laser the
It has been estimated that 30% of all farms are family-owned. In a sample of 12 farms, what is the probability that exactly three farms are family owned?
Iindicate all samples are approximately Normal with no outliers. Is the ANOVA appropriate?
the standard deviation of a normal random variable is 20. if a sample of 225 is selected out of a large population what
In this research report you will be analysing a set of data of which can be found in an EXCEL file available for download in the Assessment section of the Blackboard site.
Construct a 95% confidence interval estimate for the population proportion of adults who report that e-mails are easy to misinterpret.
Why is it important to know the standard deviation for a given sample? What do researchers learn about a normal distribution from knowledge of the standard deviation?
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