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Assume that the population distributions of times (in minutes) for two different skiers to race the same course are normal with equal variances. Two random samples, drawn independently from the populations, showed the following statistics:n1=4, Xbar1= 7.52, s2=.25 n2=5, Xbar2=8.37, s2=.09 Perform the appropriate test to determine whether there is a difference in average time of skiers to race the same course
a researcher examined rates of posttraumatic stress disorder ptsd in mothers and fathers. parents were interviewed 5
Describe the sampling distribution of p-hat, the sample proportion of college students with the cell phones who send or receive the text messages with their phones.
Explain clearly, in your own words, what is a Type I error in this context.
There is a fixed cost of $50,000 to start a production process. Once the process has begun, the variable cost per unit is $25. The revenue per unit is projected to be $45. Write a mathematical expression for total profit.
During the period of time phone-in reservations are being taken at a local university, calls come in at a rate of one every ten minutes.
if a manager believes that the required sample size is too large for a situation in which she desires to estimate the
Question 1 Which of the following indicates how many observations fall into various categories?
An engine system consists of three main components in a series, all having the same reliability.
in a clinical trial of a drug used to help subjects stop smoking 812 subjects were treated with 1 mg doses of the drug.
A contractor is considering a sale that promises a profit of $37,000 with a probability of 0.7 or a loss of (due to bad weather and such) of $18,000 with a probability of 0.3. What is the expected profit?
How many measurements should be made in order to be 90% certain that the maximum error of estimation will not exceed 2.0 seconds?
A sample of 65 observations is selected from one population with a population standard deviation of 0.75. The sample mean is 2.67.
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