Correlation and Regression 0 Correlation and Regression 1 / 29 Q.30 The correlation between sale of cold drinks and day temperature is _____. Zero Positive Negative None of these 2 / 29 Q.29 The correlation between height and intelligence is _____ . Zero Positive Negative None of these 3 / 29 Q.28 "Unemployment index and the purchasing power of the common man" - correlations are Positive Negative Zero None 4 / 29 Q.27 Age of Applicants for life insurance and the premium of insurance - correlations are Positive Negative Zero None 5 / 29 Q.26 What is spurious correlation? It is a bad relation between two variables. It is very low correlation between two variables. It is the correlation between two variables having no causal relation. It is a negative correlation. 6 / 29 Q.25 Correlation coefficient is dependent on the change of both origin & the scale of observations. TRUE FALSE Both None 7 / 29 Q.24 If x denotes height of a group of students expressed in cm. and y denotes their weight expressed in kg, then the correlation coefficient between height and weight Would be shown in kg Would be shown in cm Would be shown in kg. and cm Would be free from any unit 8 / 29 Q.23 The correlation is said to be positive When the values of two variables move in the same direction. When the values of two variables move in the opposite direction. When the values of two variables would not change. None of these 9 / 29 Q.22 If two variables x and y are independent then the correlation coefficient between x and y is _____. Positive Negative Zero One 10 / 29 Q.21 Correlation coefficient is ------ of the units of measurement. Dependent Independent Both None 11 / 29 Q.20 Correlation coefficient is a pure number. TRUE FALSE Both None 12 / 29 Q.19 Correlation coefficient between two variables is a measure of their linear relationship. TRUE FALSE Both None 13 / 29 Q.18 If high values of one tend to low values of the other, they are said to be Negatively correlated Inversely correlated Both None 14 / 29 Q.17 When high values of one variable are associated with high values of the other & low values of one variable are associated with low values of another, then they are said to be Positively correlated Directly correlated Both None 15 / 29 Q.16 When the variables are not independent, the correlation coefficient may be zero TRUE FALSE Both None 16 / 29 Q.15 If the values of y are not affected by changes in the values of x, the variables are said to be Correlated Uncorrelated Both None 17 / 29 Q.14 Simple correlation is called Linear correlation Nonlinear correlation Both None 18 / 29 Q.13 _____ is concerned with measurement of the "Strength of association" between variables. Correlation Regression Both None 19 / 29 Q.12 Correlation analysis aims at Predicting one variable for a given value of the other variable Establishing relation between two variables Measuring the extent of relation between two variables Both (2) and (3) 20 / 29 Q.11 For a p x q classification of bivariate data, the maximum number of conditional distributions is p p + q pq p or q 21 / 29 Q.10 For a p x q bivariate frequency table, the maximum number of marginal distributions is p p + q 1 2 22 / 29 Q.9 Some of the cell frequencies in a bivariate frequency table may be Negative Zero 1 or 2 None of these 23 / 29 Q.8 For a bivariate frequency table having (p + q) classification the total number of cells is p p + q q pq 24 / 29 Q.7 Bivariate Data are the data collected for Two variables More than two variables Two variables simultaneously Two variables at different points of time 25 / 29 Q.5 When cov. (x,y)=7.6(σx)2==9,r=0.28,σy=">(x,y)=7.6(σx)2==9,r=0.28,σy=(x,y)=7.6(σx)2==9,r=0.28,σy= 9.08 9.01 9.03 9.06 26 / 29 Q.4 The sum of squares of differences between ranks is found to be 60. The Spearman's coefficient of rank correlation is 0.5. What is the number of pairs in the data? N = -9 N = 9 N = 0.9 N = 0.09 27 / 29 Q.3 The difference between the actual value and estimated value calculated using regression equal is called Variation Error Residue (b) or (c) 28 / 29 Q.2 The basic principle of finding regression equations are Concurrent deviation Least squares Karl Pearson Spearman 29 / 29 Q.1 Co-efficient of correlation is affected by 'x' measured in cms and 'y' measured in kgs TRUE FALSE Your score is LinkedIn Facebook Twitter VKontakte
