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# RES 341 Final solution-----------1

Richmond CC

GPA 3.6

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Date Created: 11/17/15

1 A poll is planned to determine what proportion of all students favor an increase in fees to support a new track and field stadium A questionnaire will be published and the first 1000 completed questionnaires will be analyzed Which of the following errors will be associated with the sample A Sampling errors only B Sampling errors and errors due to selection bias D Errors due to interviewer bias and selection bias 2 A recent study of breast cancer revealed that 13 of the women in the sample used antibiotics more than 500 days in their lifetime Further 79 of these heavy antibiotics users developed breast cancer According to the American Cancer Society one in twelve women will develop breast cancer at some time in her life Of the numbers mentioned which are parameters B 1300 and 7900 C 79 and 500 days D 13 and one in twelve 3 What is the difference between probability sampling and simple random sampling A In probability sampling each item has an identical chance of being chosen B There is no difference D Probability sampling is a type of simple random sample 4 Which of the following is NOT a reason one should have knowledge of statistics A To be able to mount an effective effort to change a government regulation that negatively affects one s business B To help interpret existing information D To make future projections of one s sales 5 Which of the following is an example of statistical inference B Calculating the mean age of patients discharged from hospitals in New York State in 1997 C Counting the number of patients who file malpractice suits after being discharged from hospitals in New York State D Calculating the mean number of fruit trees damaged by Mediterranean fruit flies in California last year 6 Which of the following is NOT a characteristic of an ideal statistician A Can deal with imperfect information C Technically current eg software D Communicates well both written and oral 7 If terms such as positive negative more than and less than are used then these hypotheses are A nondirectional hypotheses B null hypotheses D alternative hypotheses 8 A variable changes the relationship between the independent and dependent variables B intervening C dependent D independent 9 Which of the following is NOT a potential source of survey error A Interviewer error B Coverage error C Measurement error 10 Which of these is NOT an acceptable type of survey question B ranking questions C pictograms D Likert scale 11 Name the item that is NOT a recognized survey guideline A quality control B design D pilot or beta test 12 Which of the following is NOT an ethical concern for the statistical researcher B Maintain data accuracy C Accurate reporting of procedures D Accepted procedures are followed 13 Which of the following is NOT an ethical concern for the statistical researcher B Use of sound methodology C Informed consent D Protection of confidentiality 14 Which of the following is not an ethical concern for the statistical researcher A Cite sources B Inhumane treatment of animals D Privacy of privacy 15 The average score for a class of 30 students was 75 The 20 male students in the class averaged 70 The 10 female students in the class averaged A 70 B 80 C 75 16 Textbook Price Number of Textbooks 25 to 35 2 35 to 45 16 45 to 55 5 55 to 65 7 65 to 75 2O Estimate the mean price of a textbook B 1108 C 6000 D 55400 17 A study of the scores on an in plant course in management principles and the years of service of the employees enrolled in the course yielded the following statistics Test Scores mean100 variance 225 Years of Service mean5 variance 81 Of test scores and years of service which measure has the greater dispersion A It is impossible to tell C The shortrun effects of those changes are always more beneficial to society than are the longrun effects D Test scores 18 Identify the scale which has no meaningful zero A ratio B ordinal D nominal 19 Which measurement uses absolute values A interval scale B ordinal scale C harmonic scale 20 Which of these measurement scales has a rank order associated with its use A Likert B Ratio D Nominal 21 The Information Commons in the main library has 150 personal computers The probability that any one of them will require repair on a given day is 002 To find the probability that exactly 25 of the computers will require repair one would use what type of probability distribution A Hypergeometric distribution B Binomial distribution D Normal distribution 22 The local police department must write on average 5 tickets a day to keep department revenues at budgeted levels Suppose the number of tickets written per day follows a Poisson distribution with a mean of 55 tickets per day Interpret the value of the mean A The mean cannot be interpreted B The number of tickets written most often is 55 tickets per day C Half of the days have less than 55 tickets written and half of the days have more than 55 tickets written 23 Which of the following cannot generate a Poisson distribution A The number of goals in the World Cup soccer game B The number of people at a movie theatre on Friday evening C The number of customers arriving at an ATM in a minute 24 The Big Red Arcade and Pizza Palace caters to young teens and sells tokens to play arcade games for 25 each and slices of pizza for 50 each The following table details the distribution of sales of pizza slices per customer and sales of arcade tokens per customer Slices of Pizza 0 1 2 3 4 5 Probability 005 010 020 030 015 020 Arcade Games 0 1 2 3 4 5 Probability 001 004 015 020 025 035 What is the total expected per customer revenue for pizza slice sales and arcade token sales A 134 C 260 D 242 25 Which of these parameters associated with a binomial experiment will produce a probability distribution with the smallest standard deviation given n is the same for each situation B p05 C p04 D p03 26 The average qualifying speed for a championship NASCAR race is 14565 mph and the standard deviation is 945 mph Only drivers who obtain zscores greater than 12 will qualify for the race If the speeds are normally distributed what minimum speed must be clocked to compete for the trophy A 1748 mph B 1469 mph C 1552 mph 27 The expected value of the sampling distribution of the sample mean equals the population means B when the population is normally distributed C when the population is symmetric D when the population size N gt 30 28 A random variable follows the student s t distribution The probability that it will be positive is AO 01 D 005 29 For a sample size of 1 the sampling distribution of the mean will be normally distributed B only if the population values are larger than 30 C regardless of the shape of the population D only if the shape of the population is positively skewed 30 A random sample of 25 observations is selected from a normally distributed population The sample variance is 10 In the 95 confidence interval for the population variance the upper limit will be B 17331 C 17110 D 6097 31 A study of 200 insomniacs paid for by the Serta Mattress Company found that the average insomniac counted 350 sheep before falling asleep with a standard deviation of 120 An insomniac is a person who has difficulty falling asleep Some useful numbers might be NORMSINV089 12265 NORMSINV0945 15982 TINV089199 01385 TINV011199 16053 TINV0055199 19302 Calculate an 89 confidence interval for the true mean number of sheep counted by insomniacs A 350i1638 C 350i1041 D 350i1356 32 A study of 200 insomniacs paid for by the Serta Mattress Company found that the average insomniac counted 350 sheep before falling asleep with a standard deviation of 120 An insomniac is a person who has difficulty falling asleep Some useful numbers might be NORMSNV089 12265 NORMSINV0945 15982 TINV089199 01385 TINV011199 16053 TINV0055199 19302 Out of the 200 insomniacs 98 reported regularly watching The Late Show with David Letterman before they began to count sheepCalculate the margin of error for a 78 confidence interval of the true proportion of insomniacs who regularly watch David Letterman before counting sheep A 0164 B 0136 D 0056 33 When a change has occurred in the mean of the process distribution the result is referred to as A a trend B a cycle D instability 34 When the only sources of variation in a production process are caused by chance the process is said to be A out of control B out of control but in balance D out of balance but under control 35 When the results of a process are either defective or acceptable the charts used for SP0 are called B control charts for variables C control charts for in control process

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