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Sluide Precalculo Apple Bing Google Yahoo Disney Simulacion Google Take Test: Prueba Unidad 4-BUSINESS STATISTIcs The coefficient of correlation r QUESTION 1 In a negatively skewed distribution, the: O mean is greater than the median and the median is greater than the mode. O mean is greater than the median and the median is smaller than the mode. O mean is smaller than the median and the median is greater than the mode. O mean is smaller than the median and the median is smaller than the mode. Omean is equal to the median and the median is equal to the mode. QUESTION 2 The coefficient of correlation ranges between 0 and 1 -1 and +1 minus infinity and plus infinity O 1 and 100 QUESTION 3 Expressed in percentiles, the interquartile range is the difference between the: 15th and 65th percentiles 20th and 70th percentiles o 25th and 75th percentiles 30th and 80th percentiles 35th and 85th percentiles

Explanation / Answer

1. In a negatively skewed distribution, the mean is greater than the median and the median is greater than the mode. (1st option is correct)

2. The coefficient of correlation ranges between -1 and +1 (2nd option is correct)

3. Expressed in percentiles, the interquartile range is the difference between the 25th and 75th percentiles (3rd option is correct)

4. When the data are skewed to the right, the measure of skewness will be Positive (3rd option is correct)

5. If the coefficient of correlation r = +/- 1, then the best-fit linear equation will include al of the data points (4th option is correct).

6. When the data are positively skewed, the mean will usually be greater than the median (1st option is correct)

7. The numerical value of the coefficient of determination, r-squared is the proportion of the variation in the dependent variable y that is explained by the best-fit linear equation.(1st option is correct)

8. In a five number summary, which of the following is not used for data summarization: Mean (3rd option is correct)

9. If the coefficient of correlation is 0, then the slope of the regression line is 0, there is no linear relationship whatsoever between the dependrent and independent variables and the coefficient of determination is zero. So all these options are correct. (4th option is correct)

10. The empirical rule states that the percentage of observations ina data set (provided the data set has a bell-shaped and symmetric distribution) that fall within one standard deviation of their mean is approximately 68%. (1st option is correct).

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