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24 votes
6. The table below describes a sample of 15 players in Major League Baseball, chosen from the starting lineups of teams in 2019. The table shows the team, age, position, height, and salary for each player, as well as several statistics from that season. These include the number of games they played (G), their batting average (AVE) (the proportion of their at-bats for which they got a hit), and their home runs (HR). ? Name Team Age Height G AVE HR Salary Cedric Mullins Orioles 25 173 cm 22 .094 0 1,400,000 Christin Stewart Tigers 25 183 cm 104 .233 10 20,000,000 Jonathan Schoop Twins 27 185 cm 121 .256 23 5,900,000 Yandy Diaz Rays 28 188 cm 79 .267 14 5,000,000 Josh Donaldson Braves 33 185 cm 155 .259 37 25,000,000 Cody Bellinger Dodgers 24 193 cm 156 .305 47 19,000,000 Maikel Franco Phillies 27 185 cm 123 .234 17 3,750,000 Marcell Ozuna Cardinals 28 185 cm 130 .241 29 $12,250,000 ? ? Suppose that we want to try to predict a player's height based on their age. ? (a) Before doing any calculations, does it seem likely that there will be a strong association between these two variables? If so, which direction do you expect for the association? ? Yes, it seems likely that there is a strong positive association Yes, it seems likely that there is a strong negative association No, it does not seem likely that there is a strong association ? ? (b) Calculate the value of the correlation coefficient, r , using a calculator. ? r = ? ? (c) Interpret the value of r : the correlation is Select an answer and Select an answer . ? (d) Find the equation of the regression line for this association (note: this may not be meaningful, depending on the value of r , but we can still use it for practice). ? ˆ y = x + ? ? (e) Ignoring the possibility that the regression line may not be a good fit for the data, use this regression line to predict the height of a player who is 26 years old. ? cm

6. The table below describes a sample of 15 players in Major League Baseball, chosen-example-1
6. The table below describes a sample of 15 players in Major League Baseball, chosen-example-1
6. The table below describes a sample of 15 players in Major League Baseball, chosen-example-2
User Gerardo Abdo
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1 Answer

24 votes
24 votes

Step 1

A) There will not be a strong association between the two variables since at some points one value decreases and the other increases.

Hence the answer to part A will be;


No,\text{ it does not se}em\text{ likely that there is a strong association}

Step 2

Calculate the value of r

Plot a graph of age against height.

Hence, the value of r is seen below as;


r=0.1207

Step 3

Interprete the value of r


\text{The correlation is }positive\text{ and negligible}

Step 4

Find the equation of the regression line for the association


\hat{y}=0.116659x+181.688

Step 5

Predict the height of a player who is 26 years old.


\begin{gathered} \hat{y}\text{ = 0.116659(26) + 181.688} \\ \hat{y}=3.033134+\text{ 181.688} \\ \hat{y}=184.721134\operatorname{cm} \\ \hat{y}\approx184.72\operatorname{cm} \end{gathered}

6. The table below describes a sample of 15 players in Major League Baseball, chosen-example-1
User Ivelius
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2.3k points