True or False:

1. Ifap-value=.95,wecanbe95%confidentthereisnodifferencebetweenthegroups.

2. Permutationtestsaregoodfortestingdifferencesbetweengroupswhenyoudon'twanttoassumethat the data are normally distributed.

3. Thestandarderrormeasuresthevariabilityintheindividualdata,whilethestandarddeviationestimatesthevariabilityinthesamplemean

4. Anoutliercancausemoreproblemsinat-testthaninaranktest.

5. Thewidthofaconfidenceintervalincreasesasthesamplesizeincreases (holding everything else constant)

6. ifthesensitivityofascreeningtestis95%andthediseaseisveryrare,thentheprobabilityyouhave thedisease,giventhatyougotapositivetest,willalsobecloseto95%.

7. Aconfidenceintervalforasinglemeangivesarangeofplausiblevaluesforthatmean

8. Acorrelationof1meansthevaluesforthetwovariablesareexactlythesame.

9. Ifyouarecomparingtwogroupswithrespectto20differentvariables,anddonotadjustforthenumberofcomparisonsyouaremaking,youwillhaveaprobabilityofmakingatype-Ierrorthatislargerthanalpha=.05.

10. Ifa95%confidenceintervalforadifferenceinmeanbloodpressurebetweentreatmentandplacebogroupsis(.68,1.3)thena2-tailedtestatalpha=.05wouldrejectthenullhypothesisthatthegroupsarethesame.