You are going to convert raw scores to z scores. The z scores are -2, -1, 0, +1, +2. The raw scores are 8, 10, 17, 22, 6, 20, 21, 22, 19, 30. How are the raw scores equivalent to z scores? Make sure to minus the mean then divide by the standard deviation X-M/SD

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On the SAT, the average Writing score is 490 points and the average Math score is 547 points. The standard deviation is 89 points on each part of the test. Now suppose 61 test takes are selected.  14% of the time the sample average Math score should be less than what? (Round to four decimals)

find 2 decile of the data  12,15,16,2,12,20,15,42,32,6,52,32,14,15,17,19,1,6

The mean score on a set of 28 tests is 75. What is the sum of all the test​ scores?

A simple data set has been provided to practice the basics of finding measures of variation. 2, 4, 8, 8 For the data​ set, determine the range and the sample standard deviation.

What is the standard error of the mean?

Describe when you would use an independent samples t-test versus a dependent samplest-test.

Mario scored 82 on his history final. The class mean was 78 with a standard deviation of 3 points. He scored 72 on his biology final with a mean score of 65 and a standard deviation of 5 points. Which grade was better compared with the class mean referencing a normal distribution?   a. The biology test is better. The z-scores for the biology exam and the history exam respectively are 1.4 and 1.33.   b. The biology test is better. The z-scores for the biology exam and the history exam respectively are 1.33 and 1.4.   c. The history test is better. The z-scores for the biology exam and the history exam respectively are 1.33and 1.4.   d. The history test is better. The z-scores for the biology exam and the history exam respectively are 1.4 and 1.33.

What is the highest relative score earned on a test?