As a researcher you are interested in examining the effect of high school students' study habits on final exam grades in the math courses. Below are the exam scores for the sample of students by different types of study habits. Practice Problems Only Reads Notes Only Reads Notes & Practice Problems 70 Doesn't Study 62 94 82 100 90 80 66 88 75 95 58 • Which is the independent variable and which is the dependent variable| • What is your null and research hypothesis? • Which test should you use (Two Sample Independent t, ANOVA, Chi-square, or correlation )? Calculate the test statistic. Please interpret whether you have statistically significant results when a = .01. a. State whether the null hypothesis is rejected. Please include critical region in your answer. b. Provide an overall sentence about the conclusion reached.

Provide an appropriate response. Suppose you were to collect data for the pair of given variables in order to make a scatterplot. For the variables time spent on homework and exam grade, which is more naturally the response variable and which is the explanatory variable? O Time spent on homework: response variable Exam grade: explanatory variable O Time spent on homework: explanatory variable Exam grade: response variable

In a few sentences come up with your own idea for either an experimental OR observational study. Why would this study be either experimental or observational? Identify the explanatory and response variables

Which of the following is NOT a threat to the internal validity of an experiment? Experimenter effects. Confounding variables Demand characteristics. Within-groups design.

Identify the dependent, independent variable, and controlled variable in each experiment. 1. A group of students was allowed to listen to music during a test while the other group was not. Test scores were then collected and compared.Independent: Dependent: Controlled: 2. Media attention is necessary for a candidate to succeed in a primary election.Independent: Dependent: Controlled:

For an experiment comparing two methods of teaching social skills training to autistic children, the independent variable is and the dependent variable is Question 11 options: teaching methods; the autistic children the autistic children; the social skills that are learned the social skills that are learned; the autistic children teaching methods; the social skills that are learned

A researcher selected an all-girls high school to study math achievement by comparing text lessons vs. visual lessons (the independent variable) and used final exam scores as the dependent variable. He arranged for text lessons in the Fall and visual lessons in the Spring. What is confounded with what? a. type of lesson with season of year b. Girls with exam scores and season of year c. type of lesson with exam scores d. season of year with exam scores

We want to investigate the connection of two factors with IQ. One factor has three levels and the other has two levels. Which of the following tests fits the setting best? You can assume that the other assumptions of the test are valid. Choose one:  a.Two-way analysis of variance b.Independence test c.Two-sample t-test