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After calculating the sample size needed to estimate a population proportion to within 0.04, your statistics professor told you the maximum allowable error must be reduced to just .01. If the original calculation led to a sample size of 800, the sample size will now have to be:
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.
It has been claimed that women live longer than men; however, men tend to be older than their wives. Ages of sixteen husbands and wives from England were obtained. The null hypothesis of equality of means is rejected. What conclusion can be made f..
From a previous study, the standard deviation of the ages is known to be 3 years.
Suppose that a quarter is randomly selected, what is the probability that this quarter has high productivity growth and has a large pay increase?
An assumption for a significance test of the correlation coefficient is that the populations, the variance of each variable is the same at each point of the other variable.
What signified to you on all of the problems that required a binomial distribution that you were to use a binomial distribution? Which problems required a binomial distribution?
Select a US citizen and a citizen of China at random, independently of one another. Determine the probability that both have type O blood?
A busy landscaping supplies company sells wood chips for garden mulch. The mulch is sold by the cubic metre and delivered to households in a small truck.
What is the null hypothesis? Use α =0.05. Compute critical value. Use α =0.05.
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop. Check the normality assumption.
The chi-square goodness of fit is______________a one-tailed test with the rejection region in the right tail.
how many chocolate chip cookies will he need to sample to estimate the mean to within 2, what is a 99% confidence interval for the average number of chips per cookie?
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