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The manager of a video library would like the variance of the waiting times of the customers not to exceed 2.30 minutes-squared. He would like to add an additional billing counter if the variance exceeds the cut-off. He checks the recent sample data. For a random sample of 24 customer waiting times, he arrives at a sample variance of 3.8 minutes-squared. The manager assumes the waiting times to be normally distributed. Perform the four-step hypothesis test at the ? = 0.05
Explain how a matched pairs experiment should be conducted to compare left- and right-hand gripping strenghts. Be sure to explain the role of randomization, and why it is important in this experiment.
at a baby shower we were discusing baby statistcs. one women told us she had read a report that for every 100 babies
Use confidence interval to determine the estimated margin of error, Then determine the sample mean.
a simple random sample of 40 salaries of ncaa football coaches as a mean of 415953 and a standard deviation of 463364.
the past many years, the average number of employees absent on Friday is 2.6. Given this data she asks you to compute the probability that more than 5 will be sick on a given Friday.
a student received an a on the first test of the semester. the student wants to calculate the probability of scoring an
In an analysis of variance summary table, if the mean square between = 35 and the mean square within = 28, then the null hypothesis of the groups having the same mean is?
we are interested in conducting a study in order to determine what percentage of voters of a state would vote for the
A drug company want to know if new drug lowest the cholesterol below the target level of 120.A random sample of 25 questions has a mean of 115 and a standard deviation of 20
Determine how large a sample would be necessary to estimate the population proportion with a margin of error of .05 at 95% confidence
A study was conducted to estimate the mean amount spent on birthday gifts for a typical family having two children. A sample of 150 was taken, and the mean amount spent was $225.
the tables below summarize the surgery survival rate for two hospitals grouped according to patient condition prior to
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