ࡱ> q` bjbjqPqP ::3 00004 dnqnqnqnqlq&sVtVtVtVtowowowߒ$Nh9gzw^owgzgz00VtVt>~~~gz60RVtVtߒ~gzߒ~~y"-Vts txnq{ T0L;~L(--JLwtowxr~x\xowowow~owowowgzgzgzgz&&&:`&&&` 000000 Understanding by Design (UbD) Template Capital Area Career Center Lesson I: Scatterplots in Precision Machining Content Standard (s): What relevant goals will this design address? S2.1.1, S2.1.2, S2.1.3, S2.1.4 Stage 1: Desired Results What are the big ideas? What specific understandings about them are desired? What misunderstandings are predictable? Students will understand: Scatterplots Lines of best fit Correlation Lurking Variables Caliper Micrometer Also, differences between correlation and causation (cause and effect) will be discussed. Essential Question(s): What arguable, recurring, and thought-provoking questions will guide inquiry and point toward the big ideas of the unit? How does a scattered set of dots on a graph represent an important relationship in actual data? Knowledge & Skill ( What is the key knowledge and skill needed to develop the desired understandings? Students will know Formula for Pearsons correlation coefficient; function and differences of calipers and micrometers. ( What knowledge and skill relates to the content standards on which the unit is focused? Students will be able to Construct a scatterplot; draw a line of best fit; calculate Pearsons correlation coefficient; discuss the difference between correlation and causation, lurking variables ... Stage 2: Assessment Evidence What evidence will be collected to determine whether or not the understandings have been developed, the knowledge and skill attained, and the state standards met? [Anchor the work in performance tasks that involve application, supplemented as needed by prompted work, quizzes, observations, etc.] Performance Task Summary: Summary in G.R.A.S.P.S. form Students will collect data related to a real-world situation, construct a scatterplot from the data, analyze the scatterplot and prepare a report to an audience appropriate for the situation.  Rubric Titles (Key Criteria) Scatterplot: Data plotted correctly, axes labeled, etc. Line of best fit: Appropriate for the data. Slope calculated from the graph and interpreted in the problem context. Correlation coefficient calculated and discussed in terms of the situation.  Formative Assessment Presentation, Authentic, Program Contextual Summative Assessment End of Unit/Course, Standardized, CACC-wide  Stage 3: Learning Activities What sequence of learning activities and teaching will enable students to perform well at the understandings in Stage 2 and thus display evidence of the desired results in stage one? Learning Activities: Consider the W.H.E.R.E.T.O elements: Scatterplot Example of Bivariate Data  Pearsons Correlation Coefficient (r) Measures the linear relationship between variables, ranges from -1 to +1 (the closer to -1 or +1 the stronger the correlation) Positive correlation changes in one variable are accompanied by changes in the other variable and in the same direction. (think positive slope) Negative correlation changes is one variable are accompanied by changes in the other variable and in the opposite direction. (think negative slope) Zero correlation No clear relationship between variables. Show examples give estimates of correlation strength  INCLUDEPICTURE "http://www.davidmlane.com/hyperstat/pictures/example_rs.GIF" \* MERGEFORMATINET  Additional scatter plots with correlation coefficients:  INCLUDEPICTURE "http://www.gseis.ucla.edu/courses/ed230bc1/notes1/scatter.gif" \* MERGEFORMATINET  Determine if the following have a positive, negative or zero (0) correlation: a. Rainfall and attendance at football games. (negative) b. The age of a car and its value. (negative) c. Length of education and annual earnings. (positive) d. Average ACT score and college GPA (positive) e. Ability to see in the dark and amount of apples eaten. (zero) f. Miles driven and amount of fuel consumed. (positive) g. Amount of smoking and incidence of lung cancer (positive) Activities Activity 1: The following table contains the number of calories and grams of fat for selected fast foods. Draw the scatter plot. Fast Food ItemGrams of FatCaloriesBurger King Whopper33584McDonalds Big Mac34572Wendys Big Classic28500Arbys Roast Beef19365Hardees Roast Beef17338Roy Rogers Roast Beef11335Burger King Whaler26478McDonalds Filet-O-Fish23415Arbys Chicken Breast Sandwich32567Burger King Chicken Tenders12223Churchs Fried Chicken (2 pc.)35487Hardees Chicken Filet Sandwich20431Kentucky Fried Chicken (2 pc.)31460Kentucky Fried Chicken Nuggets17281McDonalds Chicken Nuggets18286Roy Rogers Chicken (2 pc.)35519Wendys Chicken Filet Sandwich24479 a. Create a scatter plot and draw the line of best fit (linear regression line).  b. Identify: patterns__________________________________________ clusters___________________________________________ outliers ___________________________________________ c. Using Excel or a graphing calculator, write the equation of the linear regression line. d. How many calories would a sandwich with 15 grams of fat have? 5 grams of fat? Activity 2: Using a caliper, determine the diameter of the given 10 pins. Actual (pin)Caliper Reading.633.733.789.849.917.9781.0211.1091.1861.326 a. Create a scatter plot and draw the line of best fit (linear regression line).  b. Using Excel or a graphing calculator, write the equation of the linear regression line. c. What would the caliper reading be if the actual pin measurement was .800 in? .500 in? Activity 3: Using a micrometer, determine the diameter of the given 10 pins Pin - Actual (in)Micrometer Reading (in).633.733.789.849.917.9781.0211.1091.1861.326 a. Create a scatter plot and draw the line of best fit (linear regression line).  b. Identify: patterns__________________________________________ clusters___________________________________________ outliers ___________________________________________ c. Using Excel or a graphing calculator, write the equation of the linear regression line. d. What would the micrometer reading be if the actual pin measurement was .800 in? .500 in? e. Compare the correlation coefficients found in Activities 1 and 2. Why are they different? _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ f. Is one tool more accurate? Why would you ever want to use the less accurate tool? _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ Lurking Variable A variable that has an important effect on the relationship among the variables in a study but is not one of the variables being studies. Lurking variables drive the behavior of two other variables creating an apparent association between them. For example, lemonade consumption and crime rates are highly correlated. Now, does lemonade incite crime or does crime increase the demand for lemonade? Neither: they are joint effects of a common cause or lurking variable, namely, hot weather. Discuss the following example: A very strong negative correlation exists between owners house size and the age of his or her car(s). What is the third hidden (lurking) variable? __INCOME____________________________ Correlation and Causation High correlation DOES NOT imply causation. A study of elementary school children ages 6 to 11, finds a high positive correlation between shoe size and scores on a IQ test. Does it make sense to claim that bigger shoe size cause a higher IQ? Or, a higher IQ causes a bigger shoe size? What explains this correlation? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ Correlation or Causation? Each pair of variables shown here is strongly associated. Does I cause II, II cause I or is there a lurking variable responsible for both? I. Wearing a hearing aid II. Dying within the next ten years Lurking variable is persons age I. The amount of milk a person drinks II. The strength of a persons bones I causes II, this has been shown experimentally. Exercise and heredity also have causative effect on bone strength. I. The amount of money a person earns II. The number of years a person went to school In general, II causes I, but there are likely lurking variables such as family background and support. There are also other causative variables like vocation choices. I. A towns high school basketball gymnasium capacity II. Number of churches (or bars) in the same town Lurking variable is the local area population size. GLOSSARY OF TERMS Scatterplot A scatterplot is a graph of paired data in which the data values are plotted as (x, y) points. Scatterplots are used to examine any general trends in the relationship between two variables. If scores on one variable tend to increase with correspondingly high scores of the second variable, a positive relationship is said to exist. If high scores on one variable are associated with low scores on the other, a negative relationship exists. The extent to which the dots in a scatterplot cluster together in the form of a line indicates the strength of the relationship. Scatterplots with dots that are spread apart represent a weak relationship.  INCLUDEPICTURE "http://www.mathwords.com/s/s_assets/s10.gif" \* MERGEFORMATINET  Bivariate Bivariate data involves two variables, as opposed to many (multivariate), or one univariate. Pearsons correlation coefficient Measures the strength of the linear relationship between two variables. The correlation between two variables reflects the degree to which the variables are related. The most common measure of correlation is the Pearson Product Moment Correlation (called Pearson's correlation for short). When measured in a  HYPERLINK "http://davidmlane.com/hyperstat/A10626.html" population the Pearson Product Moment correlation is designated by the Greek letter rho (). When computed in a sample, it is designated by the letter "r" and is sometimes called "Pearson's r." Pearson's correlation reflects the degree of  HYPERLINK "http://davidmlane.com/hyperstat/A60229.html" linear relationship between two variables. It ranges from +1 to -1. A correlation of +1 means that there is a perfect positive linear relationship between variables. The scatterplot shown on this page depicts such a relationship. It is a positive relationship because high scores on the X-axis are associated with high scores on the Y-axis.  INCLUDEPICTURE "http://davidmlane.com/hyperstat/pictures/linear2.GIF" \* MERGEFORMATINET  A correlation of -1 means that there is a perfect negative linear relationship between variables. The scatterplot shown below depicts a negative relationship. It is a negative relationship because high scores on the X-axis are associated with low scores on the Y-axis.  INCLUDEPICTURE "http://davidmlane.com/hyperstat/pictures/pearson2.GIF" \* MERGEFORMATINET  A correlation of 0 means there is no linear relationship between the two variables. The second graph shows a Pearson correlation of 0.   Clusters Data points that cluster together in the form of a line. Outliers A data point that is distinctly separate from the rest of the data. Causation Causation is the relationship that holds between events, properties, or variables. Linear association (relationship) Linear relationship is when 2 variables are perfectly linearly related and the points fall on a straight line.  INCLUDEPICTURE "http://davidmlane.com/hyperstat/pictures/linear1.GIF" \* MERGEFORMATINET  Lurking Variable A lurking variable is a variable that has an important effect on the relationship among the variables in a study but is not included among the variables studied. G.R.A.S.P.S. form for performance task: Goal Role Audience Situation Product/Performance/Purpose Standards & Criteria for Success Consider the W.H.E.R.E.T.O. elements for structuring learning activities: Where Help the students know where the unit is going and what is expected. Help the teacher know where the students are coming from (prior knowledge, interests). Hook Hook all students and hold their interest. 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