correlation

What type of correlation does x and y have? => either positive or negative correlation or negative correlation or no correlation or positive correlation..

There are two things that should be done before doing regression analysis. They are: I. Collect the data and then construct a scatter plot to determine the nature of the relationship. II. Collect the data and construct a histogram. III. Compute the value of the correlation coefficient to ..

The relation between the sign of the correlation coefficient( r ) and the sign of the slope( b ) of the regression line is => when r is positive, b is also positive and when r is negative, b is also negative or when r is positive, b is negative and when r is negative, b is posit..

A researcher wishes to examine whether there is a correlation between cost of internet service per month and degree of customer satisfaction.The data collected is shown here. Calculate the correlation coefficient and describe the relationship. Dollars 12 24 14 12 18 6 9 18 17 20..

Which of the following statement(s) is/are true? I. If the correlation coefficient is significant, the equation of the regression line cannot be determined. II. The values of the dependent variable can be predicted for the values of the independent variable using the regression line equat..

Which of the following statement(s) is/are false? I. The variances (or standard deviations) for the y variables are the same for each value of the independent variable. This is equal - variance assumption. II. There is a linear relationship between the dependent variable and the independent variabl..

The life expectancy at birth (years) of males and females in some countries is shown here. Males 67 69 69 57 55 54 50 49 50 48 Females 77 76 72 60 59 57 53 51 49 50 Calculate the correlation coefficient and describe the relation. => + 0.98; strong positive relationship or - 0.98; strong n..

The heights of seven brothers and their sisters are shown here. Calculate the correlation coefficient and determine if there is an association between the heights of brothers and their sisters. Brother's height (inches) 67 73 69 68 65 63 71 Sister's height (inches) 62 65 64 63 63 58 66 =>..

The scores of 10 students in mathematics exam and statistics exam are shown here. Student A B C D E F G H I J Scores in Mathematics 86 96 72 99 90 88 93 78 82 80 Scores in Statistics 82 93 70 98 88 90 96 80 86 78 Calculate the coefficient of correlation between these two subjects. Test th..

The speed traveled and fuel consumed by the new model of a car manufactured by a company is listed here. Speed (kmph) 30 40 50 60 70 80 90 100 110 120 Fuel (litres/100 kms) 10 8 7 6 6.2 7 7.6 8.3 9 10 Calculate the correlation coefficient between the speed and the fuel consumed and descri..