Which of the following is TRUE of the correlation coefficient r? Multiplying dat

Question

Which of the following is TRUE of the correlation coefficient r? Multiplying data values (x's and y's) by 20 will have no impact on r -1 lessthanorequalto r lessthanorequalto +1 If r = 0, then there is no linear relationship between x and y. All of the answer options are correct. Frequent food questionnaires (FFQ) are a simple way obtain information on the foods individuals consume by asking them a questions about typical amounts of food consumed a day or week or month. A more accurate picture is by obtaining obtained detailed food diary (DR) for several days, randomly chosen over a certain time period. The data obtained from a frequent food questionnaire can be compared with the food diary to assess the validity of the questionnaire. The data below are for seven individuals who participated in such a study on alcohol consumption. The correlation for the data is: -0.89 0.89 0 None

Explanation / Answer

The answer is D. Correlation coefficient is a number between -1 and 1. It is used to see linear relationship between x and y . Also, if it is 0 it implies there is no linear relationship. Multiplying all x and y with a number does not impact it's value because it is a relative number

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