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Explain in detail and give an original example of the four types of probability.
1) Marginal probability
2) Union probability
3) Joint probability
4) Conditional probability
Stats Questions Set. Which of the following statements correctly compares the t -statistic to the z -score when creating a confidence interval?
All standard IQ test scores are normally distributed and are set up so that the mean score is 100. However, the standard deviation differs from test to test.
A stationery store wants to estimate the mean retail value of greeting cards that it has in its inventory. A random sample of 100 greeting cards indicates a mean value of $2.55 and a standard deviation of $0.44.
Estimate the probability the store will gross over $850 a) Fewer than 5 out of 10 business days.
Questions based on binomial distribution, variance of the binomial distribution, discrete random variable and continuous random variables.
Suppose 31% offer both retirement plans and life insurance as benefits. If a small company is randomly selected, determine the following probabilties:
Create a 95% confidence interval for population proportion of positive drug tests.
Based on these results, a confidence interval for the population mean is found to be μ = 5.7 ± 4.4. Find the degree of confidence.
Pretests, posttests and threats to internal validity and please discuss all threats to internal validity.
Jack is doing a project in educational psychology. Before the experiment, he rank-orderes all his participants according to achievement test scores.
Given the following frequency distribution, find the mean, variance, and standard deviation. Please show all of your work so I can see how to do this for the future. This one is good example of what I can do in future for real estate.
Suppose a wildlife service wishes to estimate, with 99% confidence, the mean number of days of hunting per hunter for all licensed hunters in the state during a given season, with a bound on the error of estimation equal to 2 hunting days.
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