thanks 10) Almost all of the acidity of soda pop comes from the phosphoric acid
ID: 3065348 • Letter: T
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thanks
10) Almost all of the acidity of soda pop comes from the phosphoric acid which is added to give them 10) a sharper flavor. Is there an association between the pH of the soda and the amount of phosphoric acid (in grams)? The correlation between pH and phosphoric acid is -0.991. Describe the association. A) Very strong linear association in a negative direction B) Strong linear association in a positive direction C) Weak linear association in a positive direction D) No evidence of association E) Weak linear association in a negative direction 11) The relationship between the number of games won by a minor league baseball team and the average attendance at their home games is analyzed. A regression to predict the average attendance from the number of games won has an r 0.73. Interpret this statistic. A) No association B) Positive, fairly strong linear relationship. 53.29% of the variation in average attendance is C) Positive, fairly strong linear relationship, 73% of the variation in average attendance is D) Positive, weak linear relationship. 7.29% of the variation in average attendance is explained E) Negative, fairly strong linear relationship. 53.29% of the variation in average attendance is explained by the number of games won. explained by the number of games won. by the number of games won. explained by the number of games won. 12) In a summer baseball league the number of wins had a mean of 81.79 with a standard deviation of 12) 10.89. The equation that predicts the number of wins (y) using the number of runs allowed (x) is y-159.62 0.10x. What is the predicted number of wins for a team that allowed 800 runs? Round your answer to the nearest integer A) 168 B) 82 C) 160 D) 80 13) In an area of Russia, records were kept on the relationship between the rainfall (in inches) and the 13) yield of wheat (bushels per acre). The data for a 9 year period is as follows: Rain Fall, x 13.1 11.4 16.0 15.1 21.4 12.9 9.6 18.2 18.6 Yield, y 48.5 44.2 56.8 80.4 47.2 29.9 74.0 74.0 76.8 The equation of the line of least squares is given as y -9.12+4.38x. How many bushels of wheat per acre can be predicted if it is expected that there will be 30 inches of rain? A) 122.28 B) 140.52 C) Cannot be certain of the result because 30 inches of rain exceeds the observed data. D) 8.93Explanation / Answer
10)
a) is correct
11)
r^2 = 0.73^2 = 0.5329
hence 53.29% of variation is explained
option B) is correct
12)
y^ = 159.62 - 0.10 * x
when x = 800
y^ = 159.62 - 0.10 * 800
= 159.62 - 80
= 79.62
=80
D) 80 is correct
13)
option C) is correct
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