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A random check of 81 records of inmates from all federal prisons found the confidence interval for mean prison terms per prisoner to be 2.113 years to 2.287 years. Assuming a standard deviation of 0.4 year, what is the level of confidence provided by this interval?
Construct a 94% confidence interval for the true mean fill volume for all jugs of softener.
He measured whether their answers to a standard set of mental problems were affected. His approach to manipulating his independent variable involved
Do women talk more than men? Equip male and female students with a small device that secretly records sound for arandom 30 seconds during each 12.5 minute interval for two days.
Determine Probability values based on discrete distribution.You roll a fair die three times.
Select an activity you do on a regular basis (e.g., cooking a meal, cleaning the house, doing homework, etc.) and discuss how you could apply statistical quality control to improve the quality of the output of the activity you choose.
A sample of eight male professionals has an average yearly salary of $52,165. Find the average yearly salary for the 11 people.
A two tailed test is conducted at 5% significance level what is the P-value required to reject the null hypothesis.
At a state political rally, a spaker announced "we should raise test scores so that the students are above the state median". How would you analyze this statement?
Assuming we can verify that the data set is approximately normally distributed, what percentage of times will the server be down less than 24 minutes?
Test the given claim. Identify the null hypothesis, alternative hypothesis, test statistic, P-Value or critical value(s), conclusion about the null hypothesis, and final conclusion that addresses the original claim.
In summer 2000, a growing number of warranty claims on Firestone tires sold on Ford SUVs prompted Firestone and Ford to issue a major recall. An analysis of warranty-claims data helped identify which models to recall.
While exploring data that was collected for an investigation of resources needed for software testing and improvement, you have found an outlier.
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