Stats 30 Multiple Choice Questions

MULTIPLE CHOICE. Choose the one opinion that best completes the declaration or answers the interrogation.1) The chancellor of a greater university was concerned encircling alcohol abuse on her campus and wanted to furnish out theprofraction of students at her university who visited campus bars on the weekend antecedently the last exam week. Heraider took a aimhither scantling of 250 students. The fraction of students in the scantling who visited campus bars on theweekend antecedently the last exam week is an in of ________. 1) _______A) a statistic.B) a parameter. C) a population.D) a scantling.2) Which of the aftercited statistics is not a mete of accessible leaning? 2) _______A) arithmetic mediumB) modeC) medianD)3) Grounds on the alter in the absorb of training, a shared dormitory compass, and the most received maceration intent fromthe 20072008 academic year to the 20082009 academic year for a scantling of 100 publicly-public universities are firm.Below is the boxfashion for the alter in absorb in dollars. The dispensation of the alter in absorb is3) _______A) none of the aloftB) symmetricalC) left-skewed D) right-skewed4) Which of the aftercited is sentient to marginal treasures? 4) _______A) the interquartile rangeB) the arithmetic mediumC) the 1st quartileD) the median5) If two akin enjoyly adventures A and B are mutually restricted, what is the enjoylihood that adventure A occurs?_______A) 0.50B) 1.00C) 0D) Cannot be established from the counsel loving.6) In its plummetized shape, the regular dispensation6) _______A) has an area resembling to 0.5.B) has a medium of 0 and a plummet deflexion of 1.C) cannot be used to abut discrete enjoylihood dispensations.D) has a medium of 1 and a antagonism of 0.5)7) The possessor of a fish communicate has an aider who has established that the efficacys of catfish are n ormally arranged,after a while medium of 3.2 beats and plummet deflexion of 0.8 beat. If a scantling of 16 fish is charmed, what would the plummetuntruth of the medium efficacy resembling? 7) _______A) 0.200B) 0.800 C) 0.050 D) 0.0038) The source librarian at the Library of Congress has asked her aider for an balancespell revere of the medium sum ofbooks checked out each day. The aider provides the aftercited balancespell revere: from 740 to 920 books per day. If thesource librarian perceives that the population plummet deflexion is 150 books checked out per day, and she asked heraider for a 95% faith balancetime, abutly how liberal a scantling did her aider use to state the balancetimeestimate?8) _______A) 11B) 125 C) 4D) 139) A faith balancespell was used to revere the profraction of statistics students that are females. A aimhither scantling of72 statistics students generated the aftercited 90% faith balancetime: (0.438, 0.642). Installed on the balancespell aloft, is thepopulation profraction of females resembling to 0.60? 9) _______A) No. The profraction is 54.17%.B) Yes, and we are 90% certain of it.C) Maybe. 0.60 is a believable treaconfident of the population profraction installed on the counsel aloft.D) No, and we are 90% certain of it.TABLE 9-6The nature manage engineer for a goods creator is ardent in the medium whole of nerve certain to profitcracks in stressed oak goods. She accomplishs a two -tail banner of the ineffectual fancy that the medium for the stressed oakgoods is 650. The fitted treaconfident of the Z banner statistic is a explicit sum that leads to a p-treaconfident of 0.080 for the banner.10) Referring to Consultation 9-6, judge the engineer had governmentd that the opinion fancy to banner was that the medium wasgreater than 650. What would be the p-treaconfident of this one-tail banner? 10) ______A) 0.160B) 0.960 C) 0.040 D) 0.84011) How multifarious tissues should the Kimberly Clark Corporation lot of Kleenex embrace? Researchers established that60 tissues is the medium sum of tissues used during a composed. Judge a aimhither scantling of 100 Kleenex users relinquished theaftercited grounds on the sum of tissues used during a composed:= 52, S = 22. Judge the banner statistic does lapse in therejection district at = 0.05. Which of the aftercited determinations is amend? 11) ______A) At = 0.10, we do not repel H0.C) At = 0.05, we repel H0.B) At = 0.05, we sanction H0.D) At = 0.05, we do not repel H0.TABLE 10-3The use of tenaciouss by assistance processors has grace a controversial progeny. Judge 2 tenaciouss are extensivelytested and established certain for use in fruits. A processor wants to parallel the tenaciouss for their establishationerty on retardingspoilage. Judge 15 cuts of unimpaired fruit are treated after a while tenacious I and 15 are treated after a while tenacious II, and thesum of hours until spoilage begins is commemorative for each of the 30 cuts of fruit. The results are summarized in the consultationbelow.Preservative IPreservative III = 106.4 hoursSI = 10.3 hoursII = 96.54 hoursSII = 13.4 hours12) Referring to Consultation 10-3,12) ______A) There is examinationimony that the population antagonisms among tenaciouss I and II are the similar.B) There is examinationimony of a disagreement in the population antagonisms among tenaciouss I and II.C) There is no examinationimony of a disagreement in the population antagonisms among tenaciouss I and II.D) There is no examinationimony that the population antagonisms among tenaciouss I and II are the similar.TABLE 10-12The dean of a nursery is ardent in the profraction of graduates from his nursery who own a job present on stage day.He is specially ardent in seeing if there is a disagreement in this establishation ortion for accounting and economics greaters. In aaimhither scantling of 100 of each image of greater at stage, he establish that 65 accounting greaters and 52 economics greatershad job presents. If the accounting greaters are denominated as "Group 1" and the economics maj ors are denominated as "Group2," pershape the divert fancy banner using a resemblingize of reason of 0.05.13) Referring to Consultation 10-12, the hypotheses the dean should use are:13) ______A) H0 : 1 - 2 0 versus H1: 1 - 2 < 0 B) H0 : 1 - 2 0 versus H1: 1 - 2 = 0C) H0 : 1 - 2 0 versus H1: 1 - 2 > 0 D) H0 : 1 - 2 = 0 versus H1: 1 - 2 0TABLE 11-4A campus researcher wanted to question the factors that favor intruder ramble spell in a multifold, multiequalize bu ilding oncampus. Specifically, he wanted to state whether unanalogous structure signs (structure maps versus embankment signage) favorthe allty whole of spell intruders insist-upon to extend their point and whether that spell depends on whether the startinglocation is internally or beyond the structure. Three subjects were assigned to each of the combinations of signs and startinglocations, and ramble spell in seconds from prelude to point was commemorative. An Excel output of the divertresolution is loving underneath:ANOVASource of VariationSignsStarting LocationInteractionWithinSS14008.33122884835305.33Total61649.67dfMS14008.33F2.784395484413.167P-value0.112670.133740.919506F crit5.3176455.3176455.3176451114) Referring to Consultation 11-4, the F banner statistic for bannering the main chattels of images of signs isA) 3.1742B) 0.0109C) 5.3176D) 2.784414) ______TABLE 13-11A computer software developer would enjoy to use the sum of downloads (in thousands) for the temptation account of his newshareware to prophesy the whole of fruits (in thousands of dollars) he can perfashion on the liberal account of the newshareware. Aftercited is the output from a arthither straight return concurrently after a while the residual fashion and regular enjoylihoodfashion obtained from a grounds set of 30 unanalogous sharewares that he has developed:ANOVA15) Referring to Consultation 13-11, which of the aftercited is the amend ineffectual fancy for bannering whether there is a straightrelationship among fruits and the sum of downloads?15) ______A) H0 : 1 0B) H 0 : 1 = 0C) H0 : b1 = 0D) H0 : b1 016) According to the experimental government, if the grounds shape a "bell -shaped" regular dispensation, ________ percent of theobservations succeed be embraceed after a whilein 3 plummet deflexions about the arithmetic medium. 16) ______A) 68.26B) 95.0 C) 75.00 D) 99.717) If a point contrive of grounds is abutly regularly arranged, we would furnish that abutly 17) ______A) 4 of all 5 observations would lapse among 1.28 plummet deflexions about the medium.B) 2 of all 3 observations would lapse among 1 plummet deflexion about the medium.C) 19 of all 20 observations would lapse among 2 plummet deflexions about the medium.D) All of the aloft.18) A population fashion for a superintend embraces a inventorying of 6,179 names. Using a consultation of aimhither sums, which of theaftercited regulation sums succeed answer on your inventory?18) ______A) 0694 B) 61790C) 6946 D) 0619) Judge a 95% faith balancespell for turns out to be (1,000, 2,100). Give a restriction of what it mediums to be "95%confident" in an consequence.19) ______A) 95% of the observations in the all population lapse in the loving balancetime.B) In numerous sampling, the population parameter would lapse in the loving balancespell 95% of the spell.C) In numerous sampling, 95% of the balancetimes assumed would embrace the population medium.D) 95% of the observations in the scantling lapse in the loving int erval.TABLE 9-4A garbage guild is regarding communicateing a new national anesthetic. The chattelsive spell of the anesthetic the garbage guild iscurrently conceding has a regular dispensation after a while an medium of 7.4 minutes after a while a plummet deflexion of 1.2 minutes. Thechemistry of the new anesthetic is such that the chattelsive spell should be regularly arranged after a while the similar plummetdeviation, but the medium chattelsive spell may be inferior. If it is inferior, the garbage guild succeed communicate the new anesthetic;otherwise, they succeed live to profit the older one. A scantling of extent 36 results in a scantling medium of 7.1. A fancybanner succeed be done to succor perfashion the determination.20) Referring to Consultation 9-4, the divert hypotheses are:20) ______A) H0 : = 7.4 versus H1 : 7.4B) H0 : 7.4 versus H1 : > 7.4C) H0 : > 7.4 versus H1 : 7.4D) H0 : 7.4 versus H1 : < 7.4TABLE 10-4A existent demesne guild is ardent in bannering whether, on medium, families in Gotham own been subsistence in their publichomes for hither spell than families in Metropolis own. Assume that the two population antagonisms are resembling. A aimlessscantling of 100 families from Gotham and a aimhither scantling of 150 families in Metropolis relinquish the aftercited grounds onlength of stay in public homes.Gotham:G = 35 months,SG2 = 900Metropolis:M = 50 months,SM2 = 105021) Referring to Consultation 10-4, judge = 0.01. Which of the aftercited represents the amend disposal?21) ______A) There is ample examinationimony that the medium whole of spell families in Gotham own been subsistence in their public homes isnot hither than families in Metropolis.B) There is not ample examinationimony that the medium whole of spell families in Gotham own been subsistence in their public homesis hither than families in Metropolis.C) There is not ample examinationimony that the medium whole of spell families in Gotham own been subsistence in their public homesis not hither than families in Metropolis.D) There is ample examinationimony that the medium whole of spell families in Gotham own been subsistence in their public homes ishither than families in Metropolis.22) Which of the aftercited is most enjoyly a parameter as divergent to a statistic?A) The medium jaw of the principal five students completing an ordinance.B) The medium altitude of fellow-creatures aimlessly separated from a groundsbase.C) The profraction of females registered to suffrage in a county.D) The profraction of trucks stopped yesterday that were cited for bad brakes.22) ______23) You own firm counsel on the waste by the 15 liberalst coffee -consuming nations. Which of theaftercited is the best for presenting the shares of the waste?23) ______A) A superfluity consultation. B) A pie chart.C) A side-by-side bar chart.D) A Pareto chart.24) In a right-skewed dispensation24) ______A) the median is liberalr than the arithmetic medium.B) the median resemblings the arithmetic medium.C) the median is hither than the arithmetic medium.D) None of the aloft.25) When using the public swarming government, P(A and B) is resembling toA) P(A|B)P(B). B) P(A)/P(B).C) P(A)P(B).D) P(B)/P(A).25) ______26) For some treaconfident of Z, the enjoylihood that a plummet regular wavering is underneath Z is 0.2090. The treaconfident of Z is:______A) 0.31 B) - 0.31 C) - 0.8126)D) 1.9627) For air rambleers, one of the biggest complaints is of the cessation spell among when the airplane taxis afar from themarginal until the stampede takes off. This cessation spell is public to own a skewed -right dispensation after a while a medium of 10minutes and a plummet deflexion of 8 minutes. Judge 100 stampedes own been aimlessly scantlingd. Describe the samplingdispensation of the medium cessation spell among when the airplane taxis afar from the marginal until the stampede takes off forthese 100 stampedes.27) ______A) Dispensation is skewed-right after a while medium = 10 minutes and plummet untruth = 8 minutes.B) Dispensation is abutly regular after a while medium = 10 minutes and plummet untruth = 8 minutes.C) Dispensation is abutly regular after a while medium = 10 minu tes and plummet untruth = 0.8 minutes.D) Dispensation is skewed-right after a while medium = 10 minutes and plummet untruth = 0.8 minutes.28) In the reading of faith balancetimes, if all other quantities are unnatural, an growth in the scantling extent succeedlead to ainterval.28) ______A) widerB) biasedC) narrowerD) hither significant29) You perceive that the resemblingize of reason ( ) of a banner is 5%, you can describe that the enjoylihood of committing a Image IIuntruth () is29) ______A) 2.5%.B) unrecognized.C) 95%. D) 97.5%.TABLE 11-3A existenttor wants to parallel the medium sales-to-appraisal ratios of residential establishationerties sold in lewd vicinitys (A,B, C, and D). Lewd establishationerties are aimlessly separated from each vicinity and the ratios commemorative for eac h, as shownbelow.A:B:1.2, 1.1, 0.9, 0.42.5, 2.1, 1.9, 1.6C:D:1.0, 1.5, 1.1, 1.30.8, 1.3, 1.1, 0.7Interpret the results of the resolution summarized in the aftercited consultation:SourcedfNeighborhoodsErrorTotalSS123.1819MS1.0606FPR > F10.760.0014.364430) Referring to Consultation 11-3, the nice treaconfident of Levene's banner for agreement of antagonisms at a 5% resemblingize of reason is30) ______A) 3.29 B) 0.64 C) 3.49 D) 2.48
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