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# RES 341 Final solution-----------4

Richmond CC

GPA 3.6

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Date Created: 11/17/15

1 When every member of a population has the chance of being selected based on the probability or frequency of its representation in that population you are using which type of sampling A Convenience sample B Census sample C Random sample D Quota sample 2 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 C Errors due to interviewer bias and selection bias D Only nonsampling errors 3 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 A 79 and 500 days B 79 and one in twelve C 13 and 79 D 13 and one in twelve 4 Which of the following is NOT a characteristic of an ideal statistician A Adapts answers to client desires B Can deal with imperfect information C Technically current eg software D Communicates well both written and oral 5 Which of the following is NOT a reason one should have knowledge of statistics A To help interpret existing information B To be able to mount an effective effort to change a government regulation that negatively affects one s business C To increase the amount of information available for use D To make future projections of one s sales 6 Which of the following statements is NOT true A Estimating parameters is an important aspect of descriptive statistics B A statistical test may be significant yet have no practical importance C Scientific progress consists of continual refinement of theories through hypothesis testing D Statistics is the science of collecting organizing analyzing interpreting and presenting data 7 If terms such as positive negative more than and less than are used then these hypotheses are A null hypotheses B nondirectional hypotheses C directional hypotheses D alternative hypotheses 8 A variable changes the relationship between the independent and dependent variables A intervening B moderating C dependent Dindependent 9 Which of these is NOT an acceptable type of survey question A Fill in the blank B Closed ended C Open ended D Prejudicial or biased questions 10 Name the item that is NOT a recognized survey guideline A ability to find friendly survey respondents B design C pilot or beta test D quality control 11 Which of the following is NOT a potential source of survey error A Nonresponse bias B Selection bias C Sampling error D Systemic error 12 Which of the following is NOT an ethical concern for the statistical researcher A Accurate reporting of procedures B Maintain data accuracy C Accepted procedures are followed D Conceal financial support 13 Which of the following is NOT an ethical concern for the statistical researcher A Informed consent B Use of sound methodology C Protection of confidentiality D Monetary compensation 14 Which of the following is not an ethical concern for the statistical researcher A Manipulation of data B Inhumane treatment of animals C Privacy of privacy D Cite sources 15 A child was born into the Doe family each year for five consecutive years What is the variance of the ages of the Doe children A 20 B 46 C 14 D 25 16 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 75 B 80 C 85 D 70 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 The shortrun effects of those changes are always more beneficial to society than are the longrun effects B Test scores C Years of service D It is impossible to tell 18 Identify the scale which has no meaningful zero A interval B nominal C ordinal D ratio 19 Which measurement uses absolute values A harmonic scale B ratio correct C ordinal scale D interval scale 20 Which of these measurement scales has a rank order associated with its use A Nominal B Ratio C Ordinal D Likert 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 Normal distribution B Binomial distribution C Poisson distribution D Hypergeometric distribution 22 Which of the following is a characteristic of every binomial distribution A Each outcome is mutually exclusive B Each outcome is dependent on the previous outcome C The probability of success increases from trial to trial D The outcome of a trial depends on the number of trials 23 A multiplechoice test has 20 questions and there are 4 choices for each question A student comes to class with four different colored balls of identical shape and size in her pocket She has decided to draw one ball from her pocket per question and allow the color of the ball to select the answer for each question What type of probability distribution can be used to figure out her chance of getting 10 questions right A Normal distribution B Hypergeometric distribution C Poisson distribution D Binomial distribution 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 distribution of sales of pizza slices per customer and sales of arcade tokens per customer is below 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 probability that revenues from pizza slice sales will be greater than 100 per customer A 85 B 65 C 43 D 95 25 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 1570 mph B 1748 mph C 1552 mph D 1469 mph 26 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 1 2 3 4 5 Probability 005 010 020 030 015 020 Arcade Games 1 2 3 4 5 Probability 001 004 015 020 025 035 A 242 B 134 C 260 D 669 27 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 A It will be cut to 14 of 5 B It will quadruple C It will be cut in half D It will double 28 The use of the student s t distribution requires which of the following assumptions A The population is normal B The sample is drawn from a positively skewed distribution C The population variance is known D The sample size is greater than 30 29 The expected value of the sampling distribution of the sample mean equals the population mean A when the population size N gt 30 B for all populations C when the population is symmetric D when the population is normally distributed 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 17331 B 19353 C 6097 D 17110 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 NORMSNVO89 12265 NORMSNVO945 15982 TINVO89199 01385 TNVO11199 16053 TNV0055199 19302 Calculate an 89 confidence interval for the true mean number of sheep counted by insomniacs A 35011362 B 350i1356 C 3501638 D 350i1041 32 Summary statistics computed from two independent samples are as follows n1 50 x1 175 51 185 n2 42 x2 158 and 2 324 Construct a 95 confidence interval estimate for the difference between the means of two normally distributed populations where the unknown population variances are assumed to not be equal The upper confidence limit is A 24911 B 28212 C 5788 D 19123 33 To tell if the standard deviation of a process has changed the control charts used are A R and S charts B p and R charts C S and X bar charts D x bar and p charts 34 In statistical process control a Type I error occurs if we decide that the process is A under control when it is under control B out of control when it is under control C out of control when it is out of control D under control when it is out of control 35 When the only sources of variation in a production process are caused by chance the process is said to be A under control B out of control but in balance C out of control D out of balance but under control

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