Elementary Statistics: Quiz 12: Linear Regression and Correlation 1.2 2008/09/23 16:03:45 GMT-5 2008/10/24 18:39:04.341 GMT-5 Susan Dean deansusan@deanza.edu Barbara Illowsky illowskybarbara@deanza.edu Susan Dean deansusan@deanza.edu Barbara Illowsky illowskybarbara@deanza.edu Connexions cnx@cnx.org collaborative correlation elementary linear quiz regression sofia This module is a quiz containing 10 multiple choice questions covering topics related to linear regression and correlation. This module is part of a set of companion resources to Collaborative Statistics (col10522) by Barbara Illowsky and Susan Dean. If there is a linear relationship between the quantity of food a person consumes per day and the person’s weight, the quantity of food a person consumes per day is the ______________. Aindependent variable BUnable to determine Cdependent variable A correlation coefficient for 9 pairs of data is calculated to be -0.213. Is the relationship between the variables statistically significant? AUnable to determine BNo CYes Consider the following pairs of data (independent variable given first): (17, 56) (13, 48) (35, 65) (89, 146) (55, 121) (86, 130) Calculate the Least Squares Line. Ay-hat = -20.93 + 0.73x By-hat = 33.33 + 1.24x Cy-hat = 1.24 + 33.3x Dy-hat = 0.73 - 20.93x A correlation coefficient for 6 pairs of data is calculated to be 0. Then, Athere is positive correlation between the variables. Bthe Line of Best Fit has a negative slope. Cthere is negative correlation between the variables. Dthe Line of Best Fit has a slope of zero. A study is done to see if there is a linear relationship between the life expectancy of an individual and the year of birth. The year of birth is the ______________. AUnable to determine Bdependent variable Cindependent variable If you determine a point is an outlier, you would Aignore it. Balways delete it and then recalculate the line of best fit. Cexamine it carefully and try to determine what is causing it to be an outlier. Duse it in the calculation of the Sum of Squared Errors. Consider the following pairs of data (independent variable given first): (17, 56) (13, 48) (35, 65) (89, 146) (55, 121) (86, 130) Find the estimated y for an x-value of 40. A-836 B1334 C83 D8.3 A study is done to see if there is a linear relationship between the calendar year and the population of a particular country. The calendar year is the ______________. Adependent variable BUnable to determine Cindependent variable Consider the following pairs of data (independent variable given first): (16, 56) (10, 98) (35, 105) (4, 70) (12, 121) The relationship between the two variables is ______________. Alinear Bnot significant Cparabolic Dexponential Consider the following pairs of data (independent variable given first): (16, 56) (10, 98) (35, 105) (4, 70) (12, 121) The regression line is ______________. Asteeply sloped downward Balmost horizontal Csteeply sloped upward