Sample Exam Questions CHAPTER 1 SECTION 1 WHAT IS STATISTICS MULTIPLE CHOICE 1 You take a random sample of 100 students at your university and find that their average GPA is 3 1 If you use this information to help you estimate the average GPA for all students at your university then you are doing what branch of statistics ANS B PTS 1 REF SECTION 1 1 2 A company has developed a new computer sound card whose average lifetime is unknown In order to estimate this average 200 sound cards are randomly selected from a large production line and tested their average lifetime is found to be 5 years The 200 sound cards represent a a Descriptive statistics b Inferential statistics c Sample statistics d Population statistics a parameter b statistic c sample d population ANS C PTS 1 REF SECTION 1 1 1 3 A company has developed a new computer sound card whose average lifetime is unknown In order to estimate this average 200 sound cards are randomly selected from a large production line and tested their average lifetime is found to be 5 years The 5 years represents a a parameter b statistic c sample d population a parameter b statistic c population d sample a sample b statistic c population d parameter ANS B PTS 1 REF SECTION 1 1 4 A descriptive measure that is computed from a sample is called a ANS B PTS 1 REF SECTION 1 1 5 A summary measure that is computed from a population is called a 2 ANS D PTS 1 REF SECTION 1 1 6 Which of the following is a measure of the reliability of a statistical inference a A population parameter b A significance level c A descriptive statistic d A sample statistic ANS B PTS 1 REF SECTION 1 1 7 A politician who is running for the office of governor of a state with 4 million registered voters commissions a survey In the survey 54 of the 5 000 registered voters interviewed say they plan to vote for her The population of interest is a the 4 million registered voters in the state b the 5 000 registered voters interviewed c the 54 who plan to vote for her d all the residents of the state ANS A PTS 1 REF SECTION 1 1 8 A company has developed a new battery and wants to estimate its average lifetime A random sample of 500 batteries is tested and the average lifetime of this sample is found to be 225 hours The 225 hours is the value of a a parameter b statistic c sample 3 d population ANS B PTS 1 REF SECTION 1 1 is called a finding the significance level b calculating descriptive statistics c doing inferential statistics d calculating the confidence level 9 The process of using sample statistics to draw conclusions about population parameters ANS C PTS 1 REF SECTION 1 1 10 Which of the following represents a population as opposed to a sample a 1 000 respondents to a magazine survey which has 500 000 subscribers b The first 10 students in your class completing a final exam c Every fifth student to arrive at the book store on your campus d All registered voters in the State of Michigan ANS D PTS 1 REF SECTION 1 1 4 11 A researcher at Michigan State University MSU wants to estimate the average number of credits earned by students last semester at MSU She randomly selects 500 students from last semester and finds that they averaged 14 85 credits per student The population of interest to the researcher is a all MSU students b all college students c all MSU students enrolled last semester d the 500 MSU students selected at random ANS C PTS 1 REF SECTION 1 1 12 A study is under way to determine the average height of all 32 000 adult pine trees in a certain national forest The heights of 500 randomly selected adult pine trees are measured and analyzed The sample in this study is a the average height of the 500 randomly selected adult pine trees b the average height of all the adult pine trees in this forest c all the adult pine trees in this forest d the 500 adult pine trees selected at random from this forest ANS D PTS 1 REF SECTION 1 1 13 A study is under way to determine the average height of all 32 000 adult pine trees in a certain national forest The heights of 500 randomly selected adult pine trees are measured and analyzed The parameter in the study is a the average height of the 500 randomly selected adult pine trees b the average height of all the adult pine trees in this forest c all the adult pine trees in this forest 5 d the 500 adult pine trees selected at random from this forest ANS B PTS 1 REF SECTION 1 1 14 How do confidence levels compare to significance levels a Confidence levels and significance levels are both typically small b Confidence levels and significance levels are both typically large c Confidence levels are typically small and significance levels are typically large d Confidence levels are typically large and significance levels are typically small ANS D PTS 1 REF SECTION 1 1 15 The significance level of a statistical inference measures a the proportion of times a conclusion about a population will be correct in the long run b the proportion of times a conclusion about a population will be wrong in the long run c the proportion of times an estimation procedure will be correct in the long run d the proportion of times an estimation procedure will be wrong in the long run ANS B PTS 1 REF SECTION 1 1 16 The confidence level of a statistical inference measures a the proportion of times a conclusion about a population will be correct in the long run b the proportion of times a conclusion about a population will be wrong in the long run c the proportion of times an estimation procedure will be correct in the long run 6 d the proportion of times an estimation procedure will be wrong in the long run ANS C PTS 1 REF SECTION 1 1 CHAPTER 2 SECTION 1 GRAPHICAL AND TABULAR DESCRIPTIVE TECHNIQUES 1 The classification of student major accounting economics management marketing MULTIPLE CHOICE other is an example of a n a nominal random variable b interval random variable c continuous random variable d parameter 2 an example of a n a nominal random variable b interval random variable c ordinal random variable 7 ANS A PTS 1 REF SECTION 2 1 The classification of student class designation freshman sophomore junior senior is d a parameter ANS C PTS 1 REF SECTION 2 1 3 A researcher wishes to estimate the textbook costs of first year students at Ferris State University To do so he recorded the textbook cost of 200 first year students and found that their average textbook cost was 275 per semester The variable of interest to the researcher is …
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