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1.Using data from twelve European countries, it has been calculated that the correlation between the level of car ownership and the number of road deaths is 0.73.
Which TWO of the statements shown follow from this?
A.High levels of car ownership cause high levels of road deaths
B.There is a strong relationship between the level of car ownership and the number of road deaths
C.53% of the variation in the level of road deaths from one country to the next can be explained by the corresponding variation in the level of car ownership
D.73% of the variation in the level of road deaths from one country to the next can be explained by the corresponding variation in the level of car ownership
2. The regression equation 丫 = 3 + 2X has been calculated from 6 pairs of values, with X ranging from 1 to 10. The correlation coefficient is 0.8. It is estimated that Y = 43 when X = 20.
Which TWO of the following are true?
A.The estimate is not reliable because X is outside the range of the data
B.The estimate is not reliable because the correlation is low
C.The estimate is reliable
D.The estimate is not reliable because the sample is small
