Homework Help: Stats

Posted by Jason on Friday, July 15, 2011 at 11:14am.

a raw score on a particular intelligence test is known to be approximately normally distributed in a population of 4th graders, with a mean of 95 and variance 81. which score has the property that there are 15% of scores in the population that are above it?

Stats - PsyDAG, Friday, July 15, 2011 at 11:28pm
Z = (score-mean)/SD

√Variance = SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion and its Z score.

Put the resulting values in the above equation and solve for the score.

Answer this Question

Related Questions

Stats....how do i do this?? - SAT I scores around the nation tend to have a mean...
statistics - The Intelligence Quotient (IQ) test scores are normally distributed...
statistics college - SATI SCORES AROUND THE NATION HAVE A MEAN SCORE AROUND 500 ...
statistics - SAT I scores around the nation tend to have a mean scale score ...
Statistics - SAT I scores around the nation tend to have a mean scale score ...
Stats - Suppose that a random sample of adults has a mean score of on a ...
statistics - SAT I scores around the nation tend to have a mean scale score ...
statistics - Ram earned a score of 940 on a national achievement test. The mean ...
statistics - A researcher wants to carry out a hypothesis test involving the ...
statistics probability - Alice earned a score of 940 on an IQ test.The mean test...

For Further Reading

First Name:
School Subject:
Answer: