Stats 20 Summer 2014 Midterm 1 Solutions - Exam 1...

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Stat 20Exam 1Instructor: Tessa Childers-Day16 July 2014Please write your name and student ID below, and circle your section. With yoursignature, you certify that you have not observed poor or dishonest conduct on the part ofyour classmates. You also certify that you have not been a party to poor or dishonestconduct, and that the work on this exam is solely your own.Please show your workONLY in the area provided. Work outside of this area will not be consideredfor credit.Name:Student ID:Signature:Date:Section:101 (12pm-1pm)102 (1pm-2pm)Answer the questions in the spaces provided. There are questions on the front and back ofeach page. This midterm covers the material from Lectures 1 through 13, and Homeworks1 through 6. Show your work, including labeling quantities (such as z-scores). The clearerthat your work is, the easier it is to award partial or full credit. If you do not show yourwork, you will not receive credit. You are welcome to leave your answers as fractions. Ifyou use decimals, please round all answers to two significant figures, and hold yourrounding until the final calculation.Please show your work ONLY in the areaprovided. Work outside of this area will not be considered for credit.QuestionPointsScore11529317415514Total:70
Stat 20Exam 1, Page 2 of 1116 July 20141. In order to understand a particular question of interest, we often use an experiment, observational study, or samplesurvey. The following questions ask about these topics.(a) (4 points) Before a new variety of frozen muffins is put on the market, it is subjected to extensive taste testing.People are asked to taste the new muffin and a competing brand and to say which they prefer. Both muffinsare unidentified in this test. Is this an experimental study, an observational study, or a sample survey? Pleasechoose one, and explain your choice.

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