2011Sum5W2Exam2 - 1 COURSE DSCI 3710 Print Name Exam 2 Signature Summer 5W2 2011 Student ID INSTRUCTIONS Please print your name and student ID number on

# 2011Sum5W2Exam2 - 1 COURSE DSCI 3710 Print Name Exam 2...

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1 COURSE: DSCI 3710 Print Name: Exam 2 Signature: Summer 5W2 2011 Student ID#: INSTRUCTIONS: Please print your name and student ID number on this exam. Also, put your signature on this exam.On your scantron PRINT your name and exam version. You have 110 minutesto complete this exam. The exam is open book, open notes, and open mind. You may use any type of hand calculator but please show all your work on the exam and mark all answers on the scantron. Usage of cell phones, digital cameras, PDAs, and other communication devices is prohibited. Please DO NOT pull this exam apart. When you have completed the exam, please turn your scantron and exam booklet into your instructor, at the front desk. Good luck and we wish you well on the exam. Note: Whenever question(s) are connected you may be asked to assume a result (given a value) as an answer for the previous question but this result (value) may or may not be correct. The procedure is set in place to prevent you from losing points on a subsequent question because you made a mistake on some previous question/s.
2 Use the information given below to answer the next four questions. A researcher is interested in finding out whether more female teenagers use computer chat than male teenagers. Samples of 500 female and 500 male teenagers were selected, and 430 females and 390 males used computer chat in the past week. Is there evidence that a significantly larger proportion of female teenagers use computer chat as compared to male teenagers? Use a 0.1 level of significance. 1.What is the null hypothesis for this test? mm2.Where is the Reject Ho region for testing the use of computer chat by teenage females and teenage males as stated in the above case? 3.Assuming the p-value (observed level of significance) is 0.05, what are the decision and conclusion of the test of hypothesis at the 0.1 level of significance?