Transcript Lab 12
Stat 350 Lab Session GSI: Yizao Wang Section 016 Mon 2pm30-4pm MH 444-D Section 043 Wed 2pm30-4pm MH 444-B Today’s Agenda • Final Exam Review • Final CAOS and Attitudes Survey • Lab Evaluations Important Dates • Today is the last lab of the semester • HW12 due Monday April 14th before 6pm30, 2237 Chem HW bins • Graded HW11 & HW12 in 2237 Chem HW bins, Wed and Thu, April 16th and 17th • Final exam Thu, April 17th 7pm30-9pm30 Material: all lectures/labs/HWs Since Exam 2… • We’ve covered three major topics – ANOVA – Regression – Chi-square (covered this week in lectures) • Do you know when it is appropriate to use each? ANOVA • Extension of pooled 2-independent samples t-test • Do you know how to find an estimate of the common population variance? • Do you know when it is appropriate to use Tukey’s Multiple Comparisons procedure, and how to interpret this output? Regression • Used to find linear relationship between two quantitative variables • Do you know how to test if there is a significant linear relationship? • Do you know what the assumptions for this test are, and how to check them? Suppose we want to explore the relationship between Exam 1 scores and Exam 2 scores. Which procedure would be appropriate? A) ANOVA B) Regression C) Chi-square test of independence A statistics instructor produces this scatterplot and regression line to see if her students' exam scores can be predicted from their scores on a standard test of mathematical ability. What do the numbers on the vertical axis represent? A) Statistics exam scores B) The number of people earning each exam score C) Mathematics ability scores The correlation between height and weight for a certain breed of plant is found to be 0.8. What proportion of the variability in plant weight is NOT explained by height? A) B) C) D) 1-0.8 = 0.2 (0.8)2 = 0.64 1-(0.8) 2 = 0.36 (1-0.8) 2 = 0.04 Suppose we want to compare the average Exam 2 scores for each of the 4 academic classes (e.g. Freshman, Sophomore). Which procedure would be appropriate? ANOVA Regression Chi-square test of independence Using the ANOVA table, what is an estimate of the common population variance? ANOVA Gain in Weight Between Groups Within Groups Total 300.958 300.958 55.517 55.517 Sum of Squares 601.916 3331.037 3932.953 df 2 60 62 Mean Square 300.958 55.517 F 55.517 5.421 Sig . .007 True or False The ANOVA table below provides evidence that all of the population means tested are different from each other. ANOVA Gain in Weight Between Groups Within Groups Total Sum of Squares 601.916 3331.037 3932.953 df 2 60 62 Mean Square 300.958 55.517 F 5.421 Sig . .007 Now that the term is (almost) over… 1. Evaluate this lab section: E&E forms 2. Provide current attitudes towards Statistics & clickers: – – – Ctools Link Lab Info>Stat 350 Final Attitudes Answer every question and you will receive 1 extra credit point on the final exam Do not close the webpage saying you submitted your answers 3. Provide current comprehensive knowledge of Statistics: – – – Ctools Link Lab Info>Stat 350 Final CAOS Attempt every question AND get at least 50% correct and you will receive 1 extra credit point on the final Do not close the webpage saying you submitted your answer 4. When 2&3 finished, raise your hand show me the two webpages saying you submitted your answers Now… • Complete E&E evaluation form A volunteer to collect the forms for me… • Complete the altitude and CAOS surveys Lab Info>Stat 350 Final Attitudes Lab Info>Stat 350 Final CAOS • Tell me when you have the two webpages saying that you submitted your answers • Thank you for your attendance and good luck on your final exam