Michael B.

07/06/19

Let X represent the full height of a certain species of tree. Assume that X has a normal probability distribution with mean 139 ft and standard deviation 10.7 ft.

Let X represent the full height of a certain species of tree. Assume that X has a normal probability distribution with mean 139 ft and standard deviation 10.7 ft. You intend to measure a random... more

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Statistics

03/25/19

Using a 2% significance level, can you conclude that the current average price of homes in Martha’s Vineyard is dif- ferent from $650,000? Use both the p-value and critical-value approaches.

According to an estimate, the average price of homes in Martha’s Vineyard, Massachusetts, was $650,000 in 2011 (USA TODAY, August 11, 2011). A recent random sample of 70 homes from Martha’s... more

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Statistics Anova

03/16/19

What are the differences between T-test and ANOVA?

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Statistics

03/15/19

What does it mean to divide by the standard deviation?

I'm trying to "variance-normalize" an image. In order to do so, I subtract the mean from the pixel value (to have a 0 mean), and divide by the standard deviation (to have a unit variance) right?... more

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Psychology

03/14/19

Where do psychologists typically search for literature?

I hope this is the right place to ask this question.. If not please advise. In computer science, we often check digital libraries of ACM, IEEE, etc. And also Google scholar. But are there search... more

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Statistics

03/14/19

If Z is a standard normal variable, then P(Z>0) is what?

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Statistics

03/14/19

Same mean, different standard deviation in data sets?

How would a data set containing the values of a variable with a mean of 50 and a standard deviation of 3 compare with another data set containing the same variable, but a mean of 50 and a standard... more

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Statistics Gre Gre Exam

03/14/19

Easy GRE question: Statistics?

I'm not sure how to set this statistics problem when they give me a group of arbitrary values. Can someone help? A group of 20 values has a mean of 85 and a median of 80. A different group of 30... more

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