STRAIGHTERLINE INTRODUCTION TO
STATISTICS QUESTIONS AND
ANSWERS
Four qsteps qin qthe qprocess qof qstatistics q- qcorrect qanswers q-1. qProducing qData
2. qExploratory qData qAnalysis
3. qProbability
4. qInference
Categorical qvariable q- qcorrect qanswers q-places qindividuals qinto qone qof qseveral
qgroups
Two qtypes: qnominal qand qordinal
Quantitative qVariable q- qcorrect qanswers q-represents qa qmeasurement qor qa qcount
Two qtypes: qInterval qand qratio
Nominal qVariable q- qcorrect qanswers q-categorical qvariables qwhere qthere qis qno
qnatural qorder qamong qthe qcategories
, Ordinal qvariable q- qcorrect qanswers q-categorical qvariables qwhere qthere qis qnatural
qorder qamong qthe qcategories
Interval qVariable q- qcorrect qanswers q-a qmeasurement qor qcount qfor qwhich qit
qmakes qsense qto qtalk qabout qthe qdifference qbetween qvalues, qbut qit qdoes qnot
qmake qsense qto qtalk qabout qthe qratio qbetween qvalues; q0 qdoes qnot qrepresent qthe
qabsence qof qquanitity
Ratio qVariable q- qcorrect qanswers q-quantitative qvariables qfor qwhich qit qmakes
qsense qto qtalk qabout qthe qdifference qbetween qvalues qAND qthe qratio qbetween
qvalues; q0 qrepresents qthe qabsence qof qquantity
What qtype qof qvariable?:
eye qcolor q- qcorrect qanswers q-nominal
What qtype qof qvariable?:
socioeconomic qstatus qwith qcategories qlow, qmed, qhigh q- qcorrect qanswers q-Ordinal
What qtype qof qvariable?:
Temperature q- qcorrect qanswers q-Interval
What qtype qof qvariable?:
Income q- qcorrect qanswers q-Ratio
Visual qdisplay qand qnumerical qsummary qfor qa qsingle qcategorical qvariable q- qcorrect
qanswers q-pie qchart qor qbar qchart
and qcategory qpercentages
Visual qdisplay qand qnumerical qsummary qfor qa qsingle qquantitative qvariable q-
qcorrect qanswers q-histogram qor qstemplot
qand qdescriptive qstatistics
Visual qdisplay qand qnumerical qsummary qfor qC->C q- qcorrect qanswers q-Two qway
qtable qand qconditional qpercentages
Visual qdisplay qand qnumerical qsummary qfor qC->Q q- qcorrect qanswers q-Side qby
qside qbox qplots qand qdescriptive qstatistics
Visual qdisplay qand qnumerical qsummary qfor qQ->Q q- qcorrect qanswers q-Scatterplot
qand qcorrelation qcoefficient q(r)
Standard qDeviation qRule q- qcorrect qanswers q-Approximately q
68% qof qobservations qfall qwithin q1 qsd qof qthe qmean, q
95% qwithin q2 qsd, q
99.7% q(or qvirtually qall) qwithin q3 qsds
STATISTICS QUESTIONS AND
ANSWERS
Four qsteps qin qthe qprocess qof qstatistics q- qcorrect qanswers q-1. qProducing qData
2. qExploratory qData qAnalysis
3. qProbability
4. qInference
Categorical qvariable q- qcorrect qanswers q-places qindividuals qinto qone qof qseveral
qgroups
Two qtypes: qnominal qand qordinal
Quantitative qVariable q- qcorrect qanswers q-represents qa qmeasurement qor qa qcount
Two qtypes: qInterval qand qratio
Nominal qVariable q- qcorrect qanswers q-categorical qvariables qwhere qthere qis qno
qnatural qorder qamong qthe qcategories
, Ordinal qvariable q- qcorrect qanswers q-categorical qvariables qwhere qthere qis qnatural
qorder qamong qthe qcategories
Interval qVariable q- qcorrect qanswers q-a qmeasurement qor qcount qfor qwhich qit
qmakes qsense qto qtalk qabout qthe qdifference qbetween qvalues, qbut qit qdoes qnot
qmake qsense qto qtalk qabout qthe qratio qbetween qvalues; q0 qdoes qnot qrepresent qthe
qabsence qof qquanitity
Ratio qVariable q- qcorrect qanswers q-quantitative qvariables qfor qwhich qit qmakes
qsense qto qtalk qabout qthe qdifference qbetween qvalues qAND qthe qratio qbetween
qvalues; q0 qrepresents qthe qabsence qof qquantity
What qtype qof qvariable?:
eye qcolor q- qcorrect qanswers q-nominal
What qtype qof qvariable?:
socioeconomic qstatus qwith qcategories qlow, qmed, qhigh q- qcorrect qanswers q-Ordinal
What qtype qof qvariable?:
Temperature q- qcorrect qanswers q-Interval
What qtype qof qvariable?:
Income q- qcorrect qanswers q-Ratio
Visual qdisplay qand qnumerical qsummary qfor qa qsingle qcategorical qvariable q- qcorrect
qanswers q-pie qchart qor qbar qchart
and qcategory qpercentages
Visual qdisplay qand qnumerical qsummary qfor qa qsingle qquantitative qvariable q-
qcorrect qanswers q-histogram qor qstemplot
qand qdescriptive qstatistics
Visual qdisplay qand qnumerical qsummary qfor qC->C q- qcorrect qanswers q-Two qway
qtable qand qconditional qpercentages
Visual qdisplay qand qnumerical qsummary qfor qC->Q q- qcorrect qanswers q-Side qby
qside qbox qplots qand qdescriptive qstatistics
Visual qdisplay qand qnumerical qsummary qfor qQ->Q q- qcorrect qanswers q-Scatterplot
qand qcorrelation qcoefficient q(r)
Standard qDeviation qRule q- qcorrect qanswers q-Approximately q
68% qof qobservations qfall qwithin q1 qsd qof qthe qmean, q
95% qwithin q2 qsd, q
99.7% q(or qvirtually qall) qwithin q3 qsds
