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Assumethat,onaverage,healthyyoungadultsdream90minuteseachnight,asinferredfromanumberofmeasures,includingrapideyemovement(REM)sleep.Aninvestigatorwishestodeterminewhetherdrinkingcoffeejustbeforegoingtosleepaffectstheamountofdreamtime.Afterdrinkingastandardamountofcoffee,dreamtimeismonitoredforeachof28healthyyoungadultsinarandomsample.Resultsshowasamplemean,X, of88minutesandasamplestandarddeviation, s ,of9minutes. Use t totestthenullhypothesisatthe.05levelofsignificance. Ifappropriate(becausethenullhypothesishasbeenrejected),constructa95percentconfidenceintervalandinterpretthisinterval.

Assumethat,onaverage,healthyyoungadultsdream90minuteseachnight,asinferredfromanumberofmeasures,includingrapideyemovement(REM)sleep.Aninvestigatorwishestodeterminewhetherdrinkingcoffeejustbeforegoingtosleepaffectstheamountofdreamtime.Afterdrinkingastandardamountofcoffee,dreamtimeismonitoredforeachof28healthyyoungadultsinarandomsample.Resultsshowasamplemean,X, of88minutesandasamplestandarddeviation,s,of9minutes.

  1. Usettotestthenullhypothesisatthe.05levelofsignificance.
  2. Ifappropriate(becausethenullhypothesishasbeenrejected),constructa95percentconfidenceintervalandinterpretthisinterval.

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