The measures the percentage of total variation in the response variable that is explained by the least squares regression line.
A) coefficient of determination B) coefficient of linear correlation
C) sum of the residuals squared D) slope of the regression line
Q. 2An experiment in which the experimental unit (or subject) does not know which treatment he or she is receiving is called a ________________ .
A) single-blind experiment B) double-blind experiment
C) randomized block design D) matched-pairs design
Q. 3The length of time it takes college students to find a parking spot in the library parking lot follows a normal distribution with a mean of 4.5 minutes and a standard deviation of 1 minute.
Find the cut-off time which
75.8 of the college students exceed when trying to find a parking spot in the library parking lot.
A) 5.2 min B) 5.0 min C) 4.8 min D) 5.3 min
Q. 4A recent article in the paper claims that government ethics are at an all-time low. Reporting on a recent sample, the paper claims that 36 of all constituents believe their representative possesses low ethical standards.
Assume that responses were randomly and independently collected. A representative of a district with 1,000 people does not believe the paper's claim applies to her. If the claim is true, how many of the representative's constituents believe the representative possesses low ethical standards? A) 360 B) 36 C) 640 D) 964
Q. 5The coefficient of correlation between x and y is r = 0.59. Calculate the coefficient of determination R2. Round R2 to the nearest hundredth.
A) 0.35 B) 0.59 C) 0.41 D) 0.65
Q. 6A history professor decides to give a 10-question true-false quiz. She wants to choose the passing grade such that the probability of passing a student who guesses on every question is less than 0.10.
What score should be set as the lowest passing grade? A) 8 B) 6 C) 9 D) 7
Q. 7The least squares regression line
A) minimizes the sum of the residuals squared.
B) maximizes the sum of the residuals squared.
C) minimizes the mean difference between the residuals squared.
D) maximizes the mean difference between the residuals squared.
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