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Suppose you have a list of salaries of all Major League Baseball players in 2013. Does it make sense to find a 95% confidence interval for the mean salary? If so, what is the relevant population?
A manufacturer wants to increase the shelf life of a line of cake mixes. past records indicate that the average shelf life of the mix is 216 days. after a revised mix has been developed, a sample of nine boxes of cake mix gave these shelf lives (i..
The overall average for the samples is 17 ounces. The range is only 0.5 ounce. Determine the upper and lower control-chart limits for averages for the boxes of cereal.
computing the probability values using normal distribution.each month an american household generates an average of 28
a researcher thinks that people who drive red cars drive faster than people who drive silver cars. he recorded the
In forestry there appears to be a correlation between the diameter of a tree at breast height and the totol height of the tree. For the following sample of ten white spruces first construct a scatter plot then find the correlation (r) between heig..
Preference to change blades is recorded. Do the data support the twin-blade manufacturer's claim? α=.05. This is a t-tests independent samples.
Find the point estimate p-hat and the margin of error for the confidence interval (0.444, 0.484)
if the probabilities of having a male or female child are both 0.50 find the probability that a familys seventh child
To find the necessary sample size to achieve the given level of accuracy of prediction.
A cable manufacturer has historically averaged 2.6 flaws per 1000 meters length of wire production.
What is the probability that the student is married, given the student was female? Your answer should be a decimal fraction accurate to 3 decimal places.
Roll a balanced 8-sided dice and a balanced 6 sided die and add the spots on the up-faces. Call the sum X. What is the probability distribution of the random variable X.
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