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1. For large random samples, when we look at sample means or proportions, What happens to the width of a confidence interval when the confidence level is increased from 68% to 95% (holding all else constant)? Explain briefly.
2. We randomly select 1000 adults from a population of 2 million and also randomly select 1000 adults from a population of 20 million. If the sample standard deviations are the same, how will the margins of error compare for 95% confidence intervals for the true population average? Will the margin of error for the sample from the larger population be greater than, the same, or less than the margin of error for the sample from the smaller population? Explain briefly.
Rachel determines the mean score on this test for a random sample of third graders from her school district.
If she wants to save a fixed amount each year, starting with one year from now until her 45th work anniversary, how much does she need to save each year?
Let X be the number of individuals in a simple random sample of size 50 from this population who get some relief by taking ibuprofen, and let pˆ be the sample proportion. Find the probability that the value of p is in the interval
could mud-wrestling be the cause of a rash contracted by university of washington students in the spring of 1992? two
The standard deviation of the distribution of means of change scores is 2.0 and the mean change score for the sample studied is an increase of 5.2. What is the t score?
An environmental service reported that a sample of 15 wild horses had a mean weight of 915 pounds with a sample standard deviation of 58 pounds. Calculate the margin of error, E, for a 99% confidence interval for the population mean weight µ of al..
"The yoga group had significantly higher disease-specific quality of life compared to the self-care group after 12 weeks."
Use the information obtained in to find an estimator for a2, the variance of a gamma random variable. Is the estimator obtained unbiased for all?
Let G be an unambiguous CFG without λ-productions. (a) If x L(G), show that the number of steps needed to derive x is linear in the length of x.
Please very briefly, describe a study you might conduct in which it would be appropriate to compute a Pearson r
Marketing and Consumer Behavior The water treatment facility owners in Lake Havasu City, Arizona, recently proposed changes to all user fees.
Compute the Kappa statistic and its standard error regarding reproducibility of the diagnosis of dyspnea in the clinic.
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