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Suppose many samples of size 49 are selected from a population with a mean = 225 and a standard deviation = 14. What distribution shape would you expect for your x-bar's? Why?
the number of telephone calls coming into a businesss switchboard averages 4 calls per minute.let x be the number of
let x the number of flaws on the surface of a randomly selected boiler of a certain type have a poisson distribution
Find the regression line with all of these states removed from the calculation. Draw this new line on your plot. Was this group of states inuential?
What is the best estimate of the average tread life in miles for the entire population of these tires?
The moment generating function of normal distributed random variable ,Y, with mean and variance .derive the moment generating function of X=-3Y+4.what is the distribution of X? why?
a researcher is using a chi-square test to determine whether there are any preferences among four brands of cola. with
If a claim is randomly selected, what is the probability the person was under 25 or male?
The US energy administration publishes data on residential energy consumption and expenditures in residential consumption survey: consumption and expenditures.
In a standard test for reaction time, female candidates for flight school are found to have times that are normally distributed with a mean of 0.65 seconds and a standard deviation of 0.15 seconds.
the acceptable level for insect filth in a certain food item is 3 insect fragments per 10 grams. a sample random of 60
Without constructing the 98% confidence interval for the rate of effectiveness, would you expect the interval to be longer or shorter compared to the 95% confidence interval? Why?
Using the above database, compute a t-test comparing males' and females' heights. You must determine which type of t-test to compute. Write a short interpretation of the results.
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