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A normal population has a mean of 471 and a standard deviation of 46. What percentage of all samples of size 61 will have a mean value between 454 and 482? Give your answer correct to one decimal place.
How many subjects would you approximately need to reduce the length of the 95% confidence interval to 2 units?
What was the critical F value chosen?
Ccarry out a Z test using the five steps hypothesis testing with a two-tailed test at the .05 significance level, and make a drawing of the distributions involved.
The MBA department is concerned that dual degree students may be receiving lower grades than the regular MBA students. Two independent random samples have been selected.
Select a random variable to represent the category. Produce a probability mass function for that variable, and use it to compute the mean, the median and the variance of the data in the data set. Show the probability mass function, both in tabular..
Name three elements of the inferential statistical analysis.
We are asked to investigate the hypothesis that the number of crimes is related to police expenditures because states with higher crime rates are likely to increase their police force, thereby spending more on the number of officers on the street.
Be certain to mention the direction of the relationship, the strength of the relationship, and whether our findings are statistically significant
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots.
Create probability tree showing all marginal, conditional, and joint probabilities. Create a joint probability table.
Florida State University administers a test of mathematics placement to students when they first enter the university.
Which of these statements is NOT true about CPM and PERT?
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