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Chapter 3: Q 14. (page 172)

Windy city Is it possible to use temperature to predict wind speed? Here is a scatterplot showing the average temperature (in degrees Fahrenheit) and average wind speed (in miles per hour) for 365 consecutive days at O’Hare International Airport in Chicago.14 Is r>0 or r<0? Closer to r=0orr=±1? Explain your reasoning.

Short Answer

Expert verified

The correlation is less than 0 and also the pattern is closer to the horizontal axis which means that the correlation is closer to 0 that is, r<0 and closer to 0

Step by step solution

01

Given information

The figure is:

02

Explanation

The scatter plot is a graph that shows the association between two variables. It displays the level of correlation between two variables, known as the dependent and independent variables.

The data points in the accompanying picture are arranged in a downward pattern, indicating that the correlation is less than 0 and the pattern is also closer to the horizontal axis, indicating that the correlation is closer to 0 r<0andcloserto0

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Most popular questions from this chapter

Managing diabetes People with diabetes measure their fasting plasma glucose (FPG, measured in milligrams per milliliter) after fasting for at least 8 hours. Another measurement, made at regular medical checkups, is called HbA. This is roughly the percent of red blood cells that have a glucose molecule attached. It measures average exposure to glucose over a period of several months. The table gives data on both HbA and FPG for 18 diabetics five months after they had completed a diabetes education class.

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c. Subject 15 is an outlier in the y-direction. What effect do you think this subject has on the correlation? What effect do you think this subject has on the equation of the least-squares regression line? Calculate the correlation and equation of the least-squares regression line with and without this subject to confirm your answer.

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a. Sketch a scatterplot of the data using dash time as the explanatory variable.

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