STA301 Quiz 1 by VU Topper RM

A. Symmetrical B. Negatively skewed

C. Positively skewed

D. Zero skewed

Find the mean of the values 2,4 ,7,8,9

A. 6

B. 5 C. 3 D. 30

For a positively skewed distribution median is ……………. To/than the mid quartile range A. None of the above B. Equal C. Greater

D. Less

Which of the following measures based on all observations?

1. Standard deviation
2. Mean deviation
3. None of these
4. Mean deviation and Standard deviation

Correct answer: Mean deviation and Standard deviation

The mean of a distribution is 25, the mode is 25 and the standard deviation is 5, then the coefficient of skewness will be: A. Less than zero B. None of the above C. Greater than zero

D. Equal to zero

Dividing mean deviation by mean we get a pure number known as A. Co-efficient of quartile deviation

B. Co-efficient of mean deviation

C. None of the above D. Co-efficient

If coefficient of skewness is equal to “0” then distribution will be: A. Positively skewed

B. Symmetrical

C. Negatively skewed D. Asymmetrical

Bowley’s coefficient of skewness is expressed in terms of: A. Square of units B. Different units C. Same units

D. Independent of units

When the peak of the curve becomes relatively high, it is called: A. Hetrokurtic B. Platykurtic C. Mesokurtic

D. Leptokurtic

For a symmetrical data set mean value is 150 and standard deviation 25. 68% values will lie between

A. (125,175)

B. (110,190) C. (100,200) D. (125,180)

First moment about origin is always equal to:

A. Mean

B. Standard Deviation C. Variance D. Zero

For a particular data set the Pearson’s coefficient of skewness is greater then zero. What will be the shape of distribution?

1. Symmetrical
2. Positively Skewed
3. Negatively Skewed
4. None of the above

Correct answer: Positively Skewed

In a left skewed distribution:

A. Xm-Q3 greater than Q1-X0

B. Xm-Q3 less and equal to Q1-X0 C. Xm-Q3 less than Q1-X0 D. Xm-Q3 greater and equal to Q1-X0

Which of the rule gives no information about the probability of observing a value within one standard deviation of the mean?

1. Permutation rule
2. Combination rule
3. Empirical rule
4. Chebychev’s rule

Correct answer: Chebychev’s rule

If in a simple linear regression model it is assumed that the intercept parameter is equal to 0: A. The slope of the line will also be equal to 0 B. The regression line will pass through the point (0,10)

C. The regression line will pass through the origin

D. The regression line will pass through the point (0,-10)

Pearson’s coefficient of skewness cannot be used when standard deviation is: