Statistics and Graphing: Bivariate Data
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Questions and Answers

What can be concluded about the relationship between the two quantities if the correlation coefficient is 0.91?

  • There is a weak relationship between the two quantities.
  • There is an unpredictable relationship between the two quantities.
  • There is a strong relationship between the two quantities. (correct)
  • There is no relationship between the two quantities.

What type of correlation is represented by the scatter plot with a strong positive correlation?

  • C (correct)
  • A
  • B
  • E

What is the purpose of computing the Pearson coefficient r?

  • To determine the equation of the line of best fit.
  • To determine the y-intercept of the line of best fit.
  • To determine the strength of the linear relationship. (correct)
  • To determine the slope of the line of best fit.

What can be concluded about the variables of the study if the Pearson coefficient r is close to 1?

<p>The variables have a strong positive relationship. (C)</p> Signup and view all the answers

What is the relationship between the age of the gravestone and the diameter of the lichen?

<p>As the age of the gravestone increases, the diameter of the lichen increases. (B)</p> Signup and view all the answers

What is the purpose of the study involving the number of bacteria and their ages?

<p>To determine the relationship between the number of bacteria and their ages. (A)</p> Signup and view all the answers

What can be concluded about the number of bacteria and their ages if the correlation coefficient is close to 1?

<p>The number of bacteria increases as their ages increase. (D)</p> Signup and view all the answers

What is the interpretation of a scatter plot with a strong positive correlation?

<p>As one variable increases, the other variable also increases. (A)</p> Signup and view all the answers

What is the main difference between a strong positive correlation and a strong negative correlation?

<p>The direction of the relationship. (D)</p> Signup and view all the answers

What is the purpose of Pearson's correlation coefficient?

<p>To measure the strength and direction of the linear relationship between two variables. (B)</p> Signup and view all the answers

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