RES 341 Final solution-----------2
RES 341 Final solution-----------2
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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 t39 A Errors due to mtervrewer bias and selection bias I f39 C Only nonsampling errors f D Sampling errors and errors due to 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 t A 13 and one in twelve I t39 C 79 and 500 days D P 13 and 79 3 What is the difference between probability sampling and simple random sampling P Probability sampling is a type of simple random sample P In probability sampling each item has an identical chance of being chosen A B IP D P There is no difference 4 Which of the following is an example of statistical inference A F Calculating the mean number of fruit trees damaged by Mediterranean fruit flies in California last year IF C r Calculating the mean age of patients discharged from hospitals in New York State in 1997 D P Counting the number of patients who file malpractice suits after being discharged from hospitals in New York State 5 Which of the following statements is false t A B P Statistical inference is the process of making a prediction based on only a small piece of information P A summary measure calculated from some of the items of interest is a statistic DP A summary measure calculated from all items of interest is a parameter 6 Which of the following is NOT a characteristic of an ideal statistician A F Communicates well both written and oral B F Can deal with imperfect information I D F Technically current eg software 7 If terms such as positive negative more than and less than are used then these hypotheses are A F alternative hypotheses B F nondirectional hypotheses t39 C t39 null hypotheses 8 The manipulation of the independent variable is known as the r validity A t39 C D F randomization F treatment 9 Name the item that is NOT a recognized survey guideline r deSIgn F quality control A B t39 D P pilot or beta test 10 Which of these is NOT an acceptable type of survey question P ranking questions f A C D r pictograms r Likert scale 11 Which of these is NOT an acceptable type of survey question A P Closed ended B P Prejudicial or biased questions I t39 D Open ended 12 Which of the following is NOT an ethical concern for the statistical researcher A F Use of sound methodology I t39 C Informed consent D P Protection of confidentiality 13 Which of the following is NOT an ethical concern for the statistical researcher F Maintain data accuracy A I C F Accurate reporting of procedures D f39 Accepted procedures are followed 14 Which of the following is not an ethical concern for the statistical researcher tquot A lnhumane treatment of animals 1quot B Cite sources I t39 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 P A 80 B P 70 c P 75 If 16 Textbook Number of Price Textbooks 25 to 35 2 35 to 45 16 45 to 55 5 55 to 65 7 65 to 75 20 Estimate the standard deviation of the price of a textbook l A 3385 B P 19678 IF D P 72900 17 A supermarket has determined that daily demand for eggs has a bellshaped distribution with a mean of 55 cartons and a standard deviation of six cartons If the supermarket begins each morning with a stock of 61 cartons of eggs approximately what percentage of days will there be a surplus of eggs A P quot18 B P quot68 c P quot16 I 18 Which measurement uses absolute values P ordinal scale P harmonic scale A B IP t39 A ordinal scale f39 D interval scale 19 Identify the scale which has no meaningful zero in A ordinal I r C nominal r D ratio 20 Which of these measurement scales has a rank order associated with its use I B F Nominal C F Ratio D P Likert 21 Ten bolts were selected randomly from a production line and the diameter of each was measured Why do these diameters not have a binomial distribution A F The diameters of the bolts are not independent of one another I C F They have equal probability of success D P They do have a binomial distribution 22 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 I r B Normal distribution C P Binomial distribution D F Hypergeometric distribution 23 Which of the following cannot generate a Poisson distribution The number of customers arriving at an ATM in a minute The number of people at a movie theatre on Friday evening I D F The number of goals in the World Cup soccer game 24 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 s ua on A p04 I3 p05 0 p03 If 25 A popular restaurant recently asked 300 customers how may times per month they ate steak for dinner The results were used to build the following probability distribution x 0 1 2 3 4 or more Px 005 010 020 030 015 What is the probability that revenues from pizza slice sales will be greater than 100 per customer A P 50 IP I c P 30 D P 15 26 Trudy Jones recently completed her certification examination and learned that her 2 score was 25 The examining board also informed her that a failure to pass would be all scores that were 1 or more standard deviations below the mean and that those with scores higher than 2 standard deviations above the mean would receive a special commendation award Trudy can therefore conclude that she needs more data to determine if she passed the exam I c P passed the exam and will receive a special commendation award F D passed the exam but no commendation award is forthcoming 27 A random variable follows the student s t distribution The probability that it will be positive is Ar 005 l3 1 IF o o 28 The standard error of the sample mean is equal to 5 when n25 If the sample size increases by a factor of four how will the standard error change IP Bf ltwill double c P It will be cut to 14 of 5 D P It will quadruple 29 The use of the student s t distribution requires which of the following assumptions 1 The populatlon varlance ls known F A B The sample size is greater than 30 I D F The sample is drawn from a positively skewed distribution 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 A P 6097 B P 17110 P 17331 C IP A 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 NORMSINVO89 12265 NORMSINVO945 15982 TINVO89199 01385 TNVO11199 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 P 0056 B P 0164 c P 0136 IP 32 Ceteris paribus which is narrower a 95 confidence interval with n100 or a 99 confidence interval with n30 A F The 99 confidence interval B P Need the margin of errorto tell C F They are the same width IP 33 When the results of a process are either defective or acceptable the charts used for SPC are called control charts for variables P t39 control charts for in control process F t39 B C D control charts for out of control process 34 To tell if the standard deviation of a process has changed the control charts used are A P p and R charts P S and x bar charts rt B F D x bar and p charts 35 When the only sources of variation in a production process are caused by chance the process is said to be A P out of control but in balance BF outofcontrol I D P out of balance but under control
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