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A manufacturer of computers claims its batteries last an average of 3.5 hours before needing recharging. For a sample of 10 batteries, the mean life was 3 hours and the standard deviation was 0.8. Can we conclude at the 0.01 level that the mean life before recharging for all batteries of that brand is less than 3.5 hours?
A multiple choice test with 50 questions is given. Each question has four choices. What is the student's probability of passing if passing is at least 60% correct?
Create a 99% confidence interval estimate of population mean amount of paint included in a 1 gallon can.
Can you think of a policy; political, economic, social, or otherwise, that pushes people toward avoiding one type or another?
The level of various substances in the blood of kidney dialysis patients is of concern because kidney failure and dialysis can lead to nutritional problems.
If a sample of 800 homes sold in 2004 is obtained what is the probability that between 175 & 200 homes are going to be investment?
only 3 reported that their health was excellent. Find the probability that when 13 adults are randomly selected, 3 or fewer are in excellent health.
If we were to ask three people at arbitrary, determine the probability that they will all prefer punk rock?
Find the degrees of freedom for unequal variance test. (Round down your answer to the nearest whole number.) State the decision rule for .05 significance level. (Round your answer to 3 decimal places.)
A shipment of crankshafts is believed to be defective. A simple random sample of 16 is drawn from a large shipment. Check to see if the sample is any different from the assumed population mean of 224.
It is used when it doesn't make sense to look at the mean of such variables. Explain analysis of variance, multivariate statistics, and non-parametric methods.
What proportion of the variability in steel shipments for motor vehicles is described by regression equation?
Find the critical value Zc necessary to form a confidence interval at the given level of confidence.
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