1/1POINTS
Afitnesscenterclaimsthathemeanamountoftimethatapersonspendsathegym pervisitis33
minutes.Identifythenulhypothesis,H0,andthealternative
hypothesis,Ha,intermsoftheparameterμ.
H0:μ≠33;Ha:μ=33 H0:μ=33;Ha:μ≠33 H0
...
1/1POINTS
Afitnesscenterclaimsthathemeanamountoftimethatapersonspendsathegym pervisitis33
minutes.Identifythenulhypothesis,H0,andthealternative
hypothesis,Ha,intermsoftheparameterμ.
H0:μ≠33;Ha:μ=33 H0:μ=33;Ha:μ≠33 H0:μ≥33;Ha:μ<33
H0:μ≤33;Ha:μ>33
AnswerExplanation
Corectanswer:
H0:μ=33;Ha:μ≠33
Letheparameterμ beusedtorepresenthemean.Thenulhypothesisisalways statedwithsomeform
ofequality:equal(=),greaterthanorequalto(≥),orlessthan
orequalto(≤).Therefore,inthiscase,thenulhypothesisH0 isμ=33.The
alternativehypothesisiscontradictorytothenulhypothesis,soHa isμ≠33.
QUESTION2 1/1POINTS
Theanswerchoicesbelowrepresentdifferenthypothesistests.Whichofthechoices arerighttailedtests?Selectalcorrectanswers.
•
H0:X≥17.1,Ha:X<17.1
Thatiscorect!H0:X≤3.8,Ha:X>3.8
H0:X≤7.4,Ha:X>7.4
•
•
H0:X=14.4,Ha:X≠14.4
•
•
H0:X≤3.8,Ha:X>3.8
•
•
H0:X≤7.4,Ha:X>7.4
•
•
H0:X=3.3,Ha:X≠3.3
•
AnswerExplanation
Corectanswer:
Remembertheformsofthehypothesistests.
Right-tailed:H0:X≤X0,Ha:X>X0.
Left-tailed:H0:X≥X0,Ha:X7.4
H0:X≤3.8,Ha:X>3.8
QUESTION3 0/1POINTS
FindtheType Ierrorgiventhathenulhypothesis,H0,is:abuildinginspectorclaims thatnomorethan15%
ofstructuresinthecountywerebuiltwithoutpermits.
Thebuildinginspectorthinksthatnomorethan15% ofthestructuresinthecounty
werebuiltwithoutpermitswhen,infact,nomorethan15% ofthestructuresrealywere
builtwithoutpermits.
Thebuildinginspectorthinksthatmorethan15% ofthestructuresinthecountywere
builtwithoutpermitswhen,infact,morethan15% ofthestructuresrealywerebuilt withoutpermits.
Thebuildinginspectorthinksthatmorethan15% ofthestructuresinthecountywere
builtwithoutpermitswhen,infact,atmost15% ofthestructureswerebuiltwithout permits.
Thebuildinginspectorthinksthatnomorethan15% ofthestructuresinthecounty
werebuiltwithoutpermitswhen,infact,morethan15% ofthestructureswerebuilt withoutpermits.
AnswerExplanation
Corectanswer:
AType Ierroristhedecisionnotorejecthenulhypothesiswhen,infact,itisfalse.In thiscase,theType
Ierroriswhenthebuildinginspectorthinksthatnomore
That'snotright.• $\text{Test statistic = }-2.24$Test statistic = −2.24
Thebuildinginspectorthinksthatmorethan15%ofthestructuresinthecountywere
builtwithoutpermitswhen,infact,atmost15%ofthestructureswerebuiltwithout
permits.
Thatiscorect!
$$Test statistic = −2.24
than15% ofthestructureswerebuiltwithoutpermitswhen,infact,more than15%
ofthestructureswerebuiltwithoutpermits.
Youranswer:
Content attribution- Opens a dialog
QUESTION4 1/1POINTS
Sup oseachefclaimsthathermeatbalweightislessthan4 ounces,onaverage.
Severalofhercustomersdonotbelieveher,sothechefdecidestodoahypothesistest, ata10%
significancelevel,topersuadethem.Sheco ks14 meatbals.Themean
weightofthesamplemeatbalsis3.7 ounces.Thechefknowsfrom experiencethathe
standarddeviationforhermeatbalweightis0.5 ounces.
H0:μ≥4;Ha:μ<4
α=0.1 (significancelevel)
Whatistheteststatistic(z-score)ofthisone-meanhypothesistest,roundedtotwo decimalplaces?
AnswerExplanation
Corectanswers:
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