Question

NOTE: the simple method of calculating quartiles by hand (taught in class) MUST be used for this quiz. You may use Kaddstat to check your answer. However, if the answer from your hand calculation and Kaddstat are not the same, you MUST enter your hand calculation answer. DO NOT use any complex algorithms built into calculators, or the Excel function 'quartile' Some questions list data. Type the data into Excel and use the Data Analysis or Kaddstat Boxplot for working. PLEASE MAKE SURE TO RE-CHECK ALL YOUR ANSWERS BEFORE SUBMITTING YOUR QUIZ. Ensure that all your answers are entered with the correct amount of decimal places, including the correct amount of zeros. Some web browsers may drop the zeros at the end of an answer if you save, exit and then return to the quiz (eg your browser may change your entered answer of 21.30 [to two decimal places] to 21.3 if you exit and re-enter the quiz). You must have the correct decimal places and correct number of zeros in your answer to be marked correct. Therefore, PLEASE double check all your answers directly before submitting them. These rules and tips, as well as other important rules and tips (eg NOT to use symbols such as % and $ in your answers), are listed in detail in the CML Information Sheet. Please ensure you read, understand and follow ALL these rules when completing your quiz and when you submit your quiz. This will save you losing precious marks for errors that can be easily avoided! Suppose the correlation coefficient between two variables is found to be -0.94. Which of the following statements are true? there is a strong tendency for small values of one variable to be associated with large values of the other variable there is a weak negative relationship between the variables a scatter plot of the data points would show a clear downward trend there is a strong tendency for low values of one variable to be paired with low values of the other variable there is a strong negative relationship between the variables changes in one variable cause a small change in the other variable a scatter plot of the data points would show no clear trend either upward or downward

Answer 1

The value of correlation coefficient is from -1 to 1.

We will analyze each statement.

Statement 1: True, because it has a negative sign, which shows inverse relation and also the value is close to -1, so it shows a strong inverse, negative relation.

Statement 2: False, there is a negative relation but it is not weak, the value is near to -1, which shows strong negative relation.

Statement 3: True, because the value is negative, shows inverse relation between two variables.

Statement 4: False, it has negative sign, so shows large value of one variable is associated with lower values of another variable.

Statement 5: True, there is a strong negative relation between two variables because the value is negative and near to -1.

Statement 6: False, changes in one variable would cause higher changes in another variable because it is strong negative relation.

Statement 7: False, the scatter chart would show a clear downward trend because of a negative relation between two variables.