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The average number of mosquitos in a stagnant pond is 70 per square meter with a standard deviation of 8. If a sample of 25 square meters are chosen at random for a mosquito count, find the probability that the average of those count is more than 71.3 mosquitos per square meter.
the mean age at which men in the united states marry for the first time follows the normal distribution with a mean of
1.researchers compared two groups of competitive rowers a group of skilled rowers and a group of novices. the
1) What is the purpose of calculating a test statistic? How does this value describe how the sample data either supports or contradicts a claim?
the blood pressure measurements of a single patient were taken by twelve different medical students and the results are
What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully. Hint: Assume independent events. Why might the assumption of independence be violated?
You have been given a report that presents two regression models with different numbers of independent variables. You do not have the data so you cannot re computed regression models. Nevertheless, you have been asked to find out which model is b..
stratum 3 contains 1,000 invoices, and stratum 4 contains 3,450 invoices. A sample of 500 sales invoices is needed. What type of sampling should you do? Why?
The height of women at a school are basically distributed with mean 66.4 in. and standard deviation 3.7 in. Determine the range of heights centered about the mean in which:
Why are you no longer directly comparing sample means? How does using the F test - the analysis of variance (ANOVA) reduce your Type I error rate? What is the difference between a within-groups and a between-groups variance?
A sample of size n = 14 is selected from a normal population to construct a 95% confidence interval estimate for a population mean. The interval was computed to be (7.82 to 9.64). Determine the sample standard deviation.
the number of ratios in each household in a country. is this a population or sample?the ages of three families of
a -0.947 correlation coefficient has been found between two variables after examining 43 pairs of observations. what
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