STAT 222 Module 8 QA.pdf

# Report the value of the correlation coefficient does

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Report the value of the correlation coefficient. Does the value of the correlation coefficient support your answer in part (d)? Explain how you are deciding. The correlation coefficient is 0.780 and this backs up the description given in part (d) as it is a number fairly close to 1. Chapter 10.1 Exercise Question 12 Roller coasters The data file RollerCoasters contains data (collected from ) on the maximum speed (miles per hour) and the maximum height (feet) for each of a sample of roller coasters in the U.S. Enter the data into the Corr/Regression applet. Identify the type of study: randomized experiment or observational study. Identify the experimental/observational units in this study. Identify the two variables of interest and whether each is categorical or quantitative. Which variable do you think makes more sense to use as the explanatory variable and which as the response variable? Produce a scatterplot and comment on the association between the variables as revealed in the scatterplot. (Remember to comment on form, direction, strength, and unusual observations.) Report the value of the correlation coefficient. Does the value of the correlation coefficient support your answer in part (d)? Explain how you are deciding. Chapter 10.1 Exercise Question 13 Height and finger length

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An article titled “Giving the Finger to Dating Services” appeared in Chance magazine (2008) that investigated the association between length of index finger and height. This research was spurred by a report that online dating sites were asking members for the length of their index fingers. Perhaps this information could be used to verify whether the member was reporting his or her correct height on the profile? The data file HeightAndFingerLength contains data on the height (inches) and the length of index finger of dominant hand (cm) for students in a statistics class. Enter the data into the Corr/Regression applet. Identify the type of study: randomized experiment or observational study. Observational Identify the experimental/observational units in this study. The 34 people in the study Identify the two variables of interest and whether each is categorical or quantitative. Which variable do you think makes more sense to use as the explanatory variable and which as the response variable? The explanatory variable is finger length and the response is height. Both of these are quantitative. Produce a scatterplot and comment on the association between the variables as revealed in the scatterplot. (Remember to comment on form, direction, strength, and unusual observations.) There is a moderate positive linear association between finger length and height with no unusual observations. Report the value of the correlation coefficient. Does the value of the correlation coefficient support your answer in part (d)? Explain how you are deciding.
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• Summer '18
• Null hypothesis, Statistical hypothesis testing, Correlation and dependence, Pearson product-moment correlation coefficient

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