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Suppose a sample of size 40 from a normal population with population variance 4 is used to estimate the unknown population mean.
(a) What is the probability that the obtained sample mean for a randomly selected sample will be within i0.1 of the population mean?
(b) What sample size should be used to guarantee that with probability 95% the sample mean of a random sample will be within i0.1 of the population mean?
A random variable is normally distributed, with (population mean)= 300 pounds and (standard deviation) = 50 pounds. How small can a simple random sample be if the standard error of the mean can be no more than 20 pounds?
Suppose the manufacturers claim is right, determine the probability the mean of sample is 47,840 miles or less?
She plans to use statistical methods to estimate the mean of the population of relief times.
To better understand eating patterns that might contribute to obesity, a researcher measures the average number of calories (per meal) consumed by shift worker.
the lifetimes of light bulbs of a particular type are normally distributed with a mean of 280 hours and a standard
Find the probability that student A made no mistakes when entering a randomly selected form. Find the probability that student B made no mistakes when entering a randomly selected form.
It turned out that 61% of the changes were from incorrect answers to correct and that 26% were from correct to incorrect.
Construct a Hotelling's T2 -chart and comment on process stability. Which process parameters, if any, would you investigate further?
Find the probability that at least one major earthquake will occur within the next decade.
According to the dietary guidelines from the United States Department of Agriculture, a healthful diet consists of fruits, vegetables, whole grains,.
Do these data support the claim in the article about texting versus calling? Justify your answer with appropriate evidence.
Give an example representing a discrete probability distribution and another example representing a continuous probability distribution. Explain why your choices are discrete and continuous.
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