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Suppose the organizers of the study are reconsidering their sample-size estimate. How many participants should be enrolled in each of the active and control intervention groups to achieve 80% power if a two-sided test is used with α = .05
What type of error would result in that case? Respond to at least two of your classmate's postings.
How might variance and standard deviation be applied to a real-world business-related problem? Provide a specific application in which these measures are useful.
What is the probability that more than 200 cars will require service work in a particular month?
A product is made up of two subsystems in parallel. Subsystem one consists of ten elements in series each with a failure rate of 1/100. The second subsystem consists of 5 elements in series each with a failure rate of 1/200. What is the overall re..
In a survey about soft drinks it was found that 5% of the respondents like diet soft drinks. 12% of them liked the brand Coke. Of all the Diet soda drinkers 40% liked Coke.
A fast-food restaurant sells hamburgers and chicken sandwiches. On a typical weekday, the demand for hamburgers is normally distributed with a mean 313 and a standard deviation 57; the demand for chicken sandwiches is normally distributed with a m..
I'm trying to determine what happens to the sample size if the level of confidence is reduced from 95% to 90% but the allowable error and the standard deviation remain
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level.
Which of the variables below do you think will be roughly normally distributed? Please select all that apply.
Find the probability and mean and standard deviation for given data under Binomial distribution.
Expectation and variance of a random variable and let X be a random variable with the following probability distribution:
For a two-tailed test of hypothesis (.01 significance level) to determine if there is a difference in the population means, the degrees of freedom are
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