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A researcher wishes to estimate the proportion of adults who have? high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.04 with 95?% confidence if she uses a previous estimate of 0.38, or she does not use any prior? estimates?
If the mean and trimmed mean are nearly identical, it might be thought that it makes little difference which measure of location is used. Based on your answer to the previous problem, why might it make a difference?
A simple random sample of 92 adults is chosen. Find the 42 percentile for the sample mean. Round to one decimal place.
The probability that a standard normal random variable, Z is between 1.00 and 3.00 is
Describe the potential harmful consequences of such a mistake.
Let O = { 0, 1, 2} be the outcome space in a model for tossing a coin twice and observing the total number of heads.
Use the 0.01 level in testing the claim of superiority for the new rod. Using the appropriate statistical table, what is the approximate p-value for this test?
The sample variance, s2 , is determined to be 12.5. Construct a 90% confidence interval for 2 . sThe lower bound is.
suppose that a population is known to be normally distributed with mean 2000 and standard deviation 230. if a random
I suspect that around 75% of my students will come to class each day (except for the exam dates.). How large sample do I need to ensure a 94% confidence with a margin of error of no more than 3%.
use a normal approximation to find the probability of the indicated number of voters. in this case assume that 145
Your friend tells you that the proportion of active Major League Baseball players who have a batting average greater than .300 is greater than 0.56, a claim you would like to test. The hypotheses for this test are Null Hypothesis: p ≤ 0.56, Altern..
From a drawer that contains 10 pair of gloves, six gloves are selected randomly. Let X be the number of pairs of gloves obtained. Find the probability function
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