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davenport stat500 week 6 quiz ch 10




Question;?;Given the linear correlation coefficient r and;the sample size n, determine the critical values of r. Use your finding to;state whether or not the given r represents a significant linear correlation.;Use a significance level of 0.05.;r = -0.844, n = 5;?;Question 2;5 out of 5 points;A set of data consists of the number of years;that applicants for foreign service jobs have studied German and the grades;they received on a proficiency test. The following regression equation is;obtained: y = 31.6 + 10.9x, where x represents the number of years of study;and y represents the grade on the test. What does the slope of the regression;line represent in terms of a grade on the test?;?;Question 3;10 out of 10 points;Find the value of the linear correlation coefficient r.;The paired data below consist of the test scores of 6 randomly selected;students and the number of hours they studied for the test.;Hours;5;10;4;6;10;9;Score;64;86;69;86;59;87;?;Question 4;0 out of 5 points;Select the appropriate conclusion based on the;following result;There is no significant linear correlation between scores on a math test and;scores on a verbal test.;?;Question 5;5 out of 5 points;Use the given data to find the best predicted;value of the response variable.;Eight pairs of data yield r = 0.708 and the regression equation y = 55.8 +;2.79x. Also, mean y = 71.125. What is the best predicted value of y for x =;5.7?;?;Question 6;5 out of 5 points;Which;of the following is NOT one of the most common sources or errors made in;interpreting correlation results?;?;Question 7;5 out of 5 points;Which of the following describes the coefficient;of determination?;?;Question 8;5 out of 5 points;Use the given information to find the coefficient;of determination.;A regression equation is obtained for a collection of paired data. It is;found that the total variation is 29.045, and the UNexplained variation is;13.833. Find the coefficient of determination.(Hint: You must first find the;explained variation.);?;Question 9;5 out of 5 points;Which of the following is a property of the;linear correlation coefficient r?;?;Question 10;0 out of 5 points;Use the computer display to answer the question.;A collection of paired data consists of the number of years that students;have studied Spanish and their scores on a Spanish language proficiency test.;A computer program was used to obtain the least squares linear regression;line and the computer output is shown below. Along with the paired sample;data, the program was also given an x value of 2 (years of study) to be used;for predicting test scores.;The regression equation is;score = 31.55 + 10.90(years).;Pred;Coeff;Std;Dev;T;P;Constant;31.55;3.360;4.96;0.000;Years;10.90;1.744;6.25;0.000;S =;5.651;R Sq=;83.0%;R Sq;(Adj) = 82.7%;Predicted;Values;Fit;Std;Dev Fit;95%;CI;95%;PI;53.35;3.168;(42.72;63.98);(31.61;75.09);For a person who studies for 2 years, obtain the;95% prediction interval and write a statement interpreting the interval.;?;Question 11;5 out of 5 points;Which of the following research hypotheses would be answered using a;multiple regression?


Paper#62356 | Written in 18-Jul-2015

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