Question

Focusing on the last part

41. Gravetter/Wallnau/Forzano, Essentials-Chapter 8-End-of-chaptor question 15 Aa Aa A high school teacher has designed a new course intended to help students prepare for the mathematics section of the SAT. A sample of n -20 students is rearuited to take the course and, at the end of the year, each student takes the SAT. The average score for this sample is M 562. For the general population, scores on the SAT are standardized to form a normal distribution with -500 and a-100. Standard Normal Distribution Mean 0.0 Standard Deviation - 1.0 5000 5000 -3.0 10. -2.0 0.0 2.0 3.0 0.00 00010 Can the teacher conclude that students who take the course score significantly higher than the general population? Use a one-tailed test with α-.01. The null hypothesis is H: μ - 500 The standard error is 500.00 ,and z 2.77 ,whichis beyond the critical boundary of 2.33 Reject the null hypothesis, and conclude that students who take the course score significantly higher than the general population. Compute Cohen's d for this study. (Round your answer to three decimal places.) Cohen's d- 0.620 Complete the following sentence demonstrating how the outcome of the hypothesis test and the measure of effect size would appear in a research report The new courseHad had a significant positive effect on SAT scores: M

Answer 1

0 s 5o0 dand evr - Soo has a mdim eliut

Answer 2

8. Gravetter/Wallnau/Forzano, Essentials - Chapter 5 - End-of-chapter question 8

For a population with µ = 80 and σ = 9, find the z-score for each of the following X values. (Note: You probably will need to use a formula and a calculator to find these values. Type your answers to two decimal places.)

X	z	X	z	X	z
83		75		91
67		85		68