Exam 1 Review - Exam 1 Review Statistics 110, Fall 2009...

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Exam 1 Review Statistics 110, Fall 2009 Notes ± Exam 1 will be administered on Tuesday, September 22. ± The exam will cover Chapters 1 – 8. Review all concepts, problems, and homework assignments from these chapters. The review problems presented below are from a previous semester and may not cover all of the material that will be on the exam. Materials Needed ± Calculator ± Number 2 pencil (scantrons will be used to record your responses) Correct Answers Problem Answer 1 C 2 C 3 C 4 A 5 C 6 B 7 C 8 A 9 C 10 D 11 B 12 A 13 B 14 B 15 C 16 C 17 B 18 A 19 A 20 B 21 D 22 C 23 B 24 C 25 C
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Exam 1 Review Statistics 110, Fall 2009 Review Problems 1. A factory worker always adds five extra hours to her time card each week. In terms of the true number of hours she works each week, her measurement is A) Invalid B) Unreliable C) Biased D) Confounded 2. You decide to measure the morality of an individual by using the number of hours the individual spends in church each week. A critic says that this is an inappropriate technique because many very moral people don’t go to church. The critic is saying your measurement is A) Biased B) Unreliable C) Invalid D) Confounded 3. Below is data on the number of students who took math courses and the number who failed these courses at a local high school. Course Number who Failed Number who took the Course Algebra 20 200 Geometry 11 130 Trigonometry 17 100 Calculus 9 60 Which math course had the highest number of students who failed relative to the number who took the course? A) Algebra B) Geometry C) Trigonometry D) Calculus 4. In planning for an expansion of its sewage treatment facility, a large city wants to estimate the percentage of city homes that have an in-sink garbage disposal. Eight hundred and eighty (880) homes were surveyed, and 35% (308) were found to have in-sink disposals. The margin of error at the 95% confidence level is % 4 . 3 ± . Select the appropriate confidence statement about the percent of homes in the city with an in-sink garbage disposal. A) We are 95% confident that between 31.6% and 38.4% of all homes in the city have an in-sink garbage disposal. B) We are 95% confident that between 20% and 40% of all homes in the city have an in-sink garbage disposal. C)
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Exam 1 Review - Exam 1 Review Statistics 110, Fall 2009...

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