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Correlation Test - 4

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Correlation Test - 4
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  • Question 1
    1 / -0

    If r is near to zero (i.e.) 0.1,-0.1, (or) 0.2 there is

    Solution

    As the range of correlation is 0 to 1(less to high degree correlation)

  • Question 2
    1 / -0

    The diagrammatic representation of two variables is called _________

    Solution

    A scatter diagram is a graph in which the values of two variables are plotted along the 2 axis.

  • Question 3
    1 / -0

    Who was a great biometrician and statistician?

    Solution

    Karl Pearson was an influential biometrition and statistician who has been credited with establishing the discipline of mathematical statistics.

  • Question 4
    1 / -0

    Formula for calculating correlation from the assumed mean method is

    Solution

    This is the correct formula to calculate Karl Pearson's correlation coefficient. It will take a value ranging from -1 to +1. Positive values of correlation coefficient indicate positive relationship between the two variables, while negative values are indicative of a negative relationship.

  • Question 5
    1 / -0

    Which method of measuring correlation measures any type of relationship?

    Solution

    Only karl Pearson method shows relation between two variables and spearman correlation shows ordinal aspects of the variables.

  • Question 6
    1 / -0

    Rank Correlation was found by

    Solution

    In 1904, Charles Edward Spearman developed the formula to calculate coefficient of correlation of qualitative variables.

  • Question 7
    1 / -0

    If paired scores occupy the same positions within their own distributions (high with high and low with low)

    Solution

    If high scores on one variable are paired with high scores on other variable and low scores are paired with low scores, correlation will be high and therefore Pearson's r will be high and positive.

  • Question 8
    1 / -0

    Which of the following is not a use for r?

    Solution

    Power Analysis allows us to determine the sample size required to detect an effect of a given size and it does not require the use of r.

  • Question 9
    1 / -0

    Study of price and demand eliminating supply side

    Solution

    Partial correlation measures the degree of association between two random variables while controlling or eliminating the effect of one or more other variables.

  • Question 10
    1 / -0

    If rxy = ryx, correlation between x and y is

    Solution

    When the coefficient of correlation between X and Y (rxy) is equal to the coefficient of correlation between Y and X (ryx), the relationship between X and Y is said to be symmetric.

  • Question 11
    1 / -0

    Calculate the correlation coefficient between x and y and comment on their relationship

    Solution

  • Question 12
    1 / -0

    Calculate the correlation coefficient between x and y and comment on their relationship

    Solution

  • Question 13
    1 / -0

    Cov (x,y) = 18.6; var(x) = 20.2; var(y) = 23.7. Find ‘r’.

    Solution

  • Question 14
    1 / -0

    When the correlation is only studied between two variables it is called

    Solution

    Because it is very easy and simple to calculate correlation between two variables.

  • Question 15
    1 / -0

    A researcher finds the value of correlation coefficient to be .40 between personal income and the number of years of college completed. Based upon this finding he can conclude that

    Solution

    A positive value of correlation coefficient implies that high value of one variable will correspond to a high value of another variable and vice versa.

  • Question 16
    1 / -0

    If rxy = −0.85 then ryx = ?

    Solution

    Coefficients of correlation possess the property of symmetry, i.e., rxy=ryx .

  • Question 17
    1 / -0

    Number of pairs of observations of x and y series = 10
    X series: Arithmetic average = 65
    Standard deviation = 23.33
    Y series: Arithmetic average = 66
    Standard deviation = 14.9
    Summation of products of corresponding deviation of X and Y series = + 2704
    Calculate product moment correlation of x and y series.

    Solution

     

  • Question 18
    1 / -0

    Correlation coefficient is denoted by

    Solution

    "r" denotes Karl Pearson's coefficient of correlation.

  • Question 19
    1 / -0

    The relationship between three or more variables is studied with the help of _________ correlation

    Solution

    Multiple correlation is used when the relationship between more than two variables is under study.

  • Question 20
    1 / -0

    When r = 1, there is perfect

    Solution

    As 1 shows perfect relation between two variables and the + sign shows positive relation

  • Question 21
    1 / -0

    Which of the following may have an adverse effect on the correlation coefficient?

    Solution

    Other factors being equal, a restricted range usually yields a smaller correlation coefficient.

  • Question 22
    1 / -0

    Degree of Correlation Between + 0.25 and + 0.75 is

    Solution

    If value of r is close to 0, correlation is said to be low, while the values of r close to ± represent high correlation. Degree of correlation between +0.25 and +0.75 will therefore be moderate.

  • Question 23
    1 / -0

    Multiple correlation is

    Solution

    Because here we have to go to calculate correlation twice or thrice, with different variables.

  • Question 24
    1 / -0

    Correlation coefficient is independent of change of

    Solution

    By change of scale we mean that all values of X and y series are multiplied or divided by some constant.by change of origin we mean that a constant is subtracted from all values of x and y series if the scale and origin of X and y series are changed the value of r remain unchanged.

  • Question 25
    1 / -0

    A perfect negative correlation is signified by

    Solution

    When there is perfect negative correlation, the value of correlation coefficient will be -1.

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