Sharon Seidman Ph D CAS 301 Developmental Inquiry and Methodology Exercise on t Tests Lucia is interested in whether carrots are more appealing to older or younger children Her colleague suggests that older children will eat more carrots because they are older and understand the benefit of eating vegetables However Lucia believes that younger children like carrots while older children will prefer more sophisticated vegetables She goes to her local elementary school and gives carrots to all the Kindergarteners and 3rd graders then examines how much of their serving is eaten Group Kindergarteners 3rd Graders N 15 15 Mean Carrots Eaten 75 65 S 4 8 Degrees of freedom 28 t 2 15 p 033 What is Lucia s Research Hypothesis What is Lucia s Null Hypothesis Lucia found that t 28 2 15 p 033 Should she accept or reject the Null Hypothesis Accept Reject What do these results indicate While you are asleep at night God reveals to you that children s age has nothing to do with their liking for carrots Has Lucia s study made a Type I error a Type II error or a correct decision Type 1 Explain your reasoning Type 2 Correct Decision Sharon Seidman Ph D CAS 301 Developmental Inquiry and Methodology In this cartoon Dilbert s boss with the pointy hair is suggesting a relationship between two variables What is the predictor variable What is the criterion variable Dilbert decides to design a study to see if his boss is right In Dilbert s study what is the Research hypothesis Null hypothesis Fill out the following table with the possible results of Dilbert s study the possible characteristics of the real world and the kind of decision correct or erroneous that Dilbert would make Real World Dilbert s Research Conclusion Sharon Seidman Ph D CAS 301 Developmental Inquiry and Methodology Design an experiment to test Dilbert s idea Independent Variable Group 1 Dependent Variable Prediction Group 2