Last Updated 11 Mar 2020

# Web Calculator Exercise 2

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Question 1 a. Mean age = 960/20=48 b.

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Instead, you need to use the Z distribution table in Appendix A in Jackson’s book. a. If Andrew scored 45 on this test. What is the Z score? Z=45-45 z=0 4 b. If Anna scored 30 oh this test. What is her Z score? Z=30-45 Z=-3. 75 4 c. If Bill’s Z score was 1. 5, what is his real score on this test? 1. 5 = x-45 X=51 4 d. There are 200 students in a sample. How many of these students will have scores that fall under the score of 41? Z=41-45 Z= -1 According to Appendix A . 159 x 200 Answer = 31. 8 fall under 41 4 5. Obtain the Persaon’s r and coefficient of determination for the following relationships. . Between the IQ and psychology scores. r=. 59231 Determination= . 35084 WEB: http://easycalculation. com/statistics/r-squared. php b. Between the IQ and statistics score. r= . 73667 Determination= . 54268 WEB: http://easycalculation. com/statistics/r-squared. php c. Between the psychology scores and statistics scores. r= . 71050 Determination = . 50480 WEB: http://easycalculation. com/statistics/r-squared. php 6. Using a web-calculator, obtain the appropriate correlation coefficients. r= . 85190 http://easycalculation. com/statistics/r-squared

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