Game of Choices and Probability - Statistics

Correlation is used to determine the strength of _____ between two variables X and Y.

• Symmetric Relationship

• Non-linear Relationship

• Linear Relationship

• Indirect Relationship

What is the interpretation of -0.75 to -0.99?

• perfect negative correlation

• very weak negative negative correlation

• very strong negative correlation

• none of the above

What way of determining correlation is used when variables X and Y are ratio variables?

• Pearson’s

  Product-Moment

  Correlation Coefficient

• Spearman’s

  Rank-Order

  Correlation Coefficient

• Pearson’s

  Rank-Order Correlation Coefficient

• Spearman's

  Product-Moment

  Correlation Coefficient

1. As the X values increase, the values of Y also increase.

2. What type of correlation is being described in the text?

• Cannot be determined

• Negative Correlation

• Zero Correlation

• Positive Correlation

What is the Sample Coefficient of Determination for the following data?

x: 12, 13, 10, 11, 13

y: 9, 8, 10, 13, 6

• 0.34

• 0.53

• 0.54

• 0.58

What is the equation of the regression line?

• a = y - bx

• a = y + bx

• y = ab - x

• none of the above

1. Which of the following is used in predicting values of the dependent variable

2. from the changes in the values of an independent variable?

• Correlation

• Regression

• Hypothesis

• Experimental

What is the formula for the Slope of the Regression Line?

• b = nΣxy - nΣx^2 ÷ ΣxΣy - (Σx)^2

• b = nΣxy - ΣxΣy ÷ nΣx^2 - (Σx)^2

• b = nΣxy - ΣxΣy ÷ nΣx^2 - Σx^2

• b = nΣx^2 - (Σx)^2 ÷ nΣxy - ΣxΣy

If the equation of the regression line for the age and weight of children is:

y = 6.882 + 2.548x

What is the interpretation?

• For every increase of

  1 year in the age of a child, there is a corresponding increase of 2.548 kilograms in the

  child’s weight.

• For every increase of

  1 year in the age of a child, there is a corresponding decrease of 2.548 kilograms in the

  child’s weight.

• For every increase of 2.548 year in the age of a child, there is a corresponding increase of 1 kilograms in the child’s weight.

• For every increase of 6.882 years in the age of a child, there is a corresponding increase of 2.548 kilograms in the

  child’s weight.

1. What is the amount of increase or decrease in the value of

2. y for every unit increase in the value of x?

• Linear regression

• Equation of the

  regression line

• Slope of the

  regression line

• y-intercept