Which Statement Best Describes the Association Between Variable X and Variable Y

Scatter plot, Correlation Review for Test 1. Jared collected data on the ages and heights of a random sample of elementary school students. If he plots the data catter plot, what relationship will he most likely see been age and height? A) A negative correlation 3) No correlation C) A positive correlation D) A constant correlation 2. A baseball coach graphs some data and finds the line of best fit. The equation for the line of best fit is y=0.32x-20.51, where x is the number of times at bat and y is the number of hits. How many hits should he expect from a player who is at bat 175 times? A) 35 hits B) 49 hits C) 609 hits D) 62 hits Name Answer they 4. Below is the table of data regarding the cherry blossom trees in Washington D.C. A) Make a scatter plot of the given data. Average Temp (°C) Date in April trees bloom 1.5 5.8 2.4 4.0 28 3 25 21 4.7 5.4 3.2 5.0 14 8 20 6 Temp vs. Blooming Trees 30 20 Dute bate 15 trees. 5 3. Which graph represents a positive correlation? A) B) 123456789101112 Temp B) Correlation: r=-,950 5. The scatter plot below shows the average yearly consumption of bottled water by people in the United States starting in 1990. 18 16 C) D) Gallons of Bottled Water per Person 14 12 10 1990 1992 1994 1996 1998 2000 Year Using the line of best fit, predict the average consumption of bottles water in the year 2000? A) 20 gallons 8) 18 gallons C) 20 gallons D) 19 gallons 6. Which seetter plot best represents the data given in the table? Length Flame Fire Speed (mph) 10 2 40 10 15 도 3 3 55 9 30 8 25 Al Speed 30 40 Time Langth teet 7. The table below shows how much water Nurla drinks and the average tenmperature for that day. Al Make for the given data fable Temp Temp Water is Wates Wat C (۴) consumed In a day (ot) 48 85 27 97 48 80 16 92 32 34 94 83 20 What is the correlation? positive 1. Which graph represents the correlation of its given situation correctly? mount of dog food urchased Number of flying to Hawall Number of pennie going swimming 미 10 Température 10 20 30 40 50- Outermine the correlation for eac statement. A) The number of people at your party and the number of sodas you have in the refrigerator. negative of positive B) The amount your drive to school and the amount you have to pay for positime C) The size your dog and the number of times you take it to the vet. none Amount clothing sold clothing stare Chapter 2 Practice Te A study is conducted to determine if one can predict the yield of a crop based on the amount of fertilizer applied to the soil. The response variable in this study is A) yield of the crop. B) amount of fertilizer applied to the soll. C) the experimenter. D) amount of minfall or any other variable that may explain the yield. 2. Does mandatory gun ownership prevent crime? To study this, the number of burglaries committed each month in a small town were recorded for 75 months prior to passage of a bill requiring citizens to own guns and for 56 months after passage of the bill. The goal was to see if the number of burglaries committed was affected by requiring citizens to own guns. The response variable here is A) whether or not gun ownership is required by law. B) the number of burglaries committed. C) the number of guns owned. D) whether or not a burglary was committed by a gun owner. 3. When creating a scatterplot, one should A) plot the response variable on the horizontal axis. B) plot the explanatory variable on the horizontal axis. C) use a different plotting symbol if the explanatory variable is categorical than if the response variable is categorical, D) use a plotting scale that makes the overall trend roughly linear. 4. When water flows across farm land, some of the soil is washed away, resulting in erosion. An experiment was conducted to investigate the effect of the rate of water flow on the amount of soil washed away. Flow is measured in liters per second and the eroded soil is measured in kilograms. The data are given in the following table. Flow rate 31 85 1.26 2.47 3.75 Eroded Soil 82 1.95 2.18 3.01 6.07 The association between flow rute and amount of eroded soil is A) positive. B) negative. C) neither positive nor negative. D) impossible to determine since both variables are categorical. Page 1