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Let X be a normally distributed random variable with a mean 100 and standard deviation of 10. Find the probability that X is between 70 and 110. (Round your answer to the nearest whole number percent and include the percent symbol.)
Q1) A device has a constant failure rate of 0.7 /year. (a) What is the probability that the device will fail during the second year of operation?
find the value of the standardized z-test statistic. test ho p 0.75 verses ha pgt0.75 when the sample has n20 p0.78 and
Determine a 95% confidence interval for the mean efficiency of a given batch of motors. If we want to cut the confidence interval by 1/3, how many motors should be tested?
Among the half that had surgery, 80% showed improvement after three months, but only 54% of those who used the wrist splints improved. what's the standard error of the difference in the two proportions?
a particular genetic disease occurs in anyone who has one copy of gene a and two copies of gene b genes a and b are
(a) the average number of taxis waiting, and (b) the proportion of arriving customers that get taxis.
When the machine is properly calibrated, what is the probability that the mean for a simple random sample of this size will be at least 26.2 seconds?
Calculate η 2 , the percentage of variance accounted for by treatment.
How much time does it take on the average from the moment a plane joins the queue until it lands and clears the runway?
How do the results of the NPV technique relate to the goal of maximizing shareholder wealth?
Define the terms parameter and statistic. Be sure that the concepts of population and sample are included in your definitions.
Some of the methods in this section are approximations rather than exact probability results. We have given rules of thumb for safe use of these approximations.
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