Positive square root of the squared deviations of the values of a variance from their mean value is called.........

• A) Standard deviation
• B) Average deviation
• C) Variance
• D) Semi-inter quartile range

Which of the following is not a necessary condition for regression analysis?

• A) The standard deviation of each of the conditional distributions must be the same.
• B) For each X value, there is a group of Y values and these Y values are normally distributed.
• C) The Y values are independent.
• D) The slope of the regression line is positive (increasing).

In EXCEL to calculate the coefficient of determination, there is a separate function called

• A) SSQ
• B) SQR
• C) RSQ
• D) RSS

Summary statistics for two samples of data are
Sample 1: mean= 19 variance= 10
Sample 2: mean= 10 variance= 19
Which sample has the more spread of observations?

• A) Sample 1 has more spreadness
• B) Neither; they have the same spread
• C) Sample 2 has more spreadness
• D) There is not enough information to answer the question

The main points of interest for simple linear regression are:

• A) STEM-Standard Error of mean and T-Statistic.
• B) Correlation Coefficient.
• C) all given options.
• D) Coefficient of determination.

The sample coefficient of correlation

• A) All given choices are correct
• B) reports the percent of the variation in the dependent variable explained by the independent variable.
• C) is the square of the coefficient of correlation.
• D) cannot be negative.

Which of the following is the equation of the regression line passing through the origin?

• A) $\bar Y = a + b\bar X$
• B) $\bar Y = a - b\bar X$
• C) $\bar Y = b\bar X$
• D) $\bar Y = a$

The moving averages of the Prices 90,70,30,110 are

• A) 63.33, 70
• B) 65.50, 75
• C) 73.33, 80
• D) 45.45, 68

What is the purpose of the INTERCEPT function in Excel?

• A) Calculates the y-intercept of a line
• B) Estimates future values based on historical data
• C) Computes the standard error of the predicted y-values
• D) Finds the slope of a line

In EXCEL use the …………….function to calculate correlation

• A) COREL
• B) CORRELATION
• C) CORRELE
• D) CORREL

Ms. Christian calculated a correlation coefficient of .75. Which of the following reflects the best interpretation of this?

• A) Strong negative.
• B) Weak positive.
• C) Strong positive.
• D) Weak negative.

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

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

The regression co-efficient of Y (byx ) , the regression co-efficient of X ( bxy) and correlation co-efficient (r ) will have

• A) positive signs
• B) different signs
• C) same signs
• D) negative signs

If the regression line: Y= 3+5X meets y-axis at ‘8’ units distance from origin then the value of x-intercept is

• A) 11/5
• B) 3/5
• C) 1
• D) -(3/5)

If a = 5 , b = 1 , then an estimating regression line is

• A) X = 5 + 5Y.
• B) Y = 1 + 5X.
• C) X = 5 - Y.
• D) Y = 5 + X.

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

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

For the regression line: Y= -X + 5, y-intercept is

• A) 5
• B) 1
• C) -5
• D) -1

A moving average is one of a family of similar techniques used to analyze

• A) Regression model
• B) Fitting a curve
• C) Time series data
• D) Correlation data

If Mean of X = 7.857 , Mean of Y = 4.857 , and Slope = -0.47538
Then intercept of the data is

• A) 9.978
• B) 8.592
• C) 5.627
• D) 7.911

The moving averages of the Prices 20, 30, 40, 50, 60 are

• A) 35, 45, 55
• B) 30, 40, 50
• C) 20, 40, 60
• D) 40, 40, 40