What is the relationship between the RSQ function and the correlation coefficient?

• A) RSQ is the square of the correlation coefficient.
• B) RSQ is unrelated to the correlation coefficient.
• C) RSQ is the square root of the correlation coefficient.
• D) RSQ is double the correlation coefficient.

Equation of line having slope 0 and passing through the point A (0, 1) is

• A) Y =1
• B) Y-1= X
• C) X-1= 2(Y+1)
• D) X=1

If the increase in one variable causes increase in the another variable, the form of correlation between the variables must be

• A) Positive
• B) Negative
• C) Perfect
• D) Imperfect

In scatter diagram, correlation is called negative, if the value of the dependent variable decreases as the value of the independent variable increases.

• A) False
• B) True
• C)
• D)

Standard deviation can be calculated by taking deviation from any measure of central tendency

• A) True
• B) False
• C)
• D)

The moving average CANNOT be used for one of the followings.

• A) Time Series Variation
• B) Short-term fluctuations
• C) Standard Deviations
• D) Smoothing Operation

The straight line passing through points (1, 2), (-15, 2) and (15, 2) has slope

• A) infinity
• B) 2
• C) zero
• D) 1

The coefficient of variation for a set of annual incomes is 18%; the coefficient of variation for the length of service with the company is 29%. What does this indicate?

• A) Dispersions are equal
• B) Dispersion in the two distributions (income and service) cannot be compared using percents
• C) More dispersion in the lengths of service compared with income
• D) More dispersion in the distribution of the incomes compared with the dispersion of their length of service

In a simple linear regression analysis, the correlation coefficient (r) and the slope (b1) have the same sign.

• A) Always
• B) Sometimes
• C) Most of the times
• D) Never

The correlation between two variables measures the extent to which they are

• A) associated
• B) related with respect to effect.
• C) causally related
• D) mutually exclusive

If Sxy = -3.27, Sx = 2.416 and r = -0.091, then Standard deviation of Y is

• A) 14.87
• B) 12.85
• C) 15.88
• D) 13.86

As the regression line equation is y = ax + b, where a is

• A) The slope
• B) The y-intercept
• C) y = x
• D) The x-intercept

In formula RSQ(known_y's,known_x's), the arguments must be either

• A) numbers or names.
• B) arrays.
• C) all options are valid.
• D) references that contain numbers..

If the regression line is $Y = 8 – 5X$, then “$8$” is the ………. and “$-5$” is the …………… of the regression line.

• A) Intercept, slope
• B) Slope, regression coefficient
• C) Radius, intercept
• D) Slope, intercept

Let, Variation (Y) = n*Sum(y^2) – [Sum(y)]^2
Variation (X) = n*Sum(x^2) – [Sum(x)]^2 Then, the following formula of slope
b = {Sum(X*Y) – [ Sum(x)*Sum(y)] }/ Variation (X)

• A) d)None of these
• B) b)for the regression line X on Y
• C) a)for the regression line Y on X
• D) c) Both (a) and (b)

In the regression line equation $Y = a + bX;\,\,b$ is called the _______.

• A) X-intercept
• B) Slope
• C) Y -intercept
• D) None of these

Which of the following are the components of time series?

• A) Trend
• B) Irregular variation
• C) Seasonal variation
• D) All of these.

In correlation analysis

• A) We consider the intercept with the Y-axis.
• B) We study the strength of the association between two variables.
• C) None of these
• D) We consider several independent variables.

When r=0 it means that there is ..... between the random variables.

• A) No correlation
• B) Nonsense correlation
• C) Positive correlation
• D) Negative correlation

If the INTERCEPT function returns a value of 0, what does it mean?

• A) Regression line passes through the origin.
• B) Dependent and independent variables are uncorrelated.
• C) No relationship between the variables.
• D) Slope of the line is zero.