[DI Mean measüres he [Ej None of the above A] The smaller the standard deviation

Question

[DI Mean measüres he [Ej None of the above A] The smaller the standard deviation, the more clustered the data around the mean, the taller the peak of the histogram. 2. Which of the following is not true? [B] Chebyshev's inequality applies to all distributions regardless of the shape of distributions. Cj A parameter describes a population cheracteristic, whereas a statistic describes a sample characteristic. [D) Z-score value cannot be used to detect the outliers. E] None of the above. 3. Which of the following is not true regarding the simple linear regression line? [A] The least-squares regression line always travels through the point (x. y) [B) If the linear correlation coefficient is zero, then y IC] A residual is the difference between the observed and predicted explanatory values. D] Values of the explanatory variable those are much larger or much smaller than those observed are considered outside the scope of the model. [E] None of the above. 4. The method used for obtaining the regression line is the Least Squares Method (LS). Which of the following is not true? [A] The residuals sum is zero. [B] There should be positive and negative residuals unless they all equal to zero. [C] The LS method minimizes some of the squared residuals. [D] The LS method minimizes sum of the squared residuals. [E] None of the above.

Explanation / Answer

2. (D) will be correct option.

3. (D) Values of Explanatory variable can be in thousands or million,but that does not affect the observed ones, since they are two different variables and have different scaling. So, if we want to regress price of a daily necessary item on population, the item will always have small absolute values compared to the population. This does not effect the regression.

4.(C) This option does not make any sense.

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