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The population of Douglas fir trees was shown to have an approximately normal diameter distribution with mu = 50 centimeters (cm) and sigma = 12 cm. Find the diameter d such that 30% of the Douglas fir trees in the population have diameters that exceed d.
The cost of an e-commerce website can vary a great deal. A market research team hypothesized that the cost of an average website is $3500.
an exclusive club for top students has to elect a new president and treasure. there are 50 students in the club and all
if a player rolls two dice and get a sum of 3 and 11 she wins 30. if the person gets 7 she wins 15. the cost to play
payment times of 100 randomly selected cus- tomers this month had an average of 35 days. the standard deviation from
In comparing the two variances below, what is the test value and what are the degrees of freedom that should be used?
A researcher is testing the effect of a new cold and flu medication on reaction time. A sample of n = 9 students is obtained and each student is given the normal dose of the medicine.
suppose that you are interested in determining the cost of tuition and fees at universities in the united states.
consider a sequence of independent bernoulli trials with p0.28.a what is the expected number of trials to obtain the
an experiment involves selecting a random sample of 283 middle managers study. one item of interest is their mean
the length of human pregnancies from conception to birth varies according to a distribution that is approximately
A normal distribution with a mean of 33 oz. and a standard deviation of 0.8 oz. What proportion of packets are underweight (i.e., weigh less than 32 oz.)?
Standard deviation of the sampling distribution of sample proportion is 0.025. However, the report did not indicate what the sample size n was. What was it?
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