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Problem: When determining the sample size needed to achieve a particular error estimate you need to know standard deviation. What are two methods of estimating standard deviation if the standard deviation is unknown? Please describe your solutions.
A researcher has compiled a file of information on a random sample of 317 families that have chronic, long-term patterns of child abuse.
suppose a mutual fund qualifies as having moderate risk if the standard deviation of its monthly rate of return is less
An urn contains 8 black and 9 green balls. Five balls are randomly drawn from the urn in succession, with replacement.That is, after each draw, the selected ball is returned to the urn. What is the probability that all 5 balls drawn from the ur..
If you have a choice between two estimates, the sample mean from a sample of size 5 and a sample mean from a sample of size 10.
What is the regression line? Give an example of simple correlation between two variables.
On what percent of days did it actually rain?- On what percent of days was rain predicted?- What percent of the time was the forecast correct?
The names of 200 patrons of a casino are drawn from a list of visitors for the past month, and a questionnaire is administered to them.
If the Prudential Insurance Company surveys its customers to determine the number of children under age 22 living in each household.
Correlation is used to determine the strength of a relationship between two variables. What kind of variables? Quantitative ones. The result of a correlation will be a number ranging between -1 and 1.
Comprise appropriate (BPS formatted) descriptive statistics table inferential statistics table.
Explain three factors that make investigating arson and explosions particularly difficult for forensic scientists.
Be sure to specifically identify the statistical formulas and what additional data you would need to determine your estimate(s).
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