There is conﬂicting information about whether a new medication affects a person's
abilin to concentrate as measured by time spent on a task You wish to test the following claim (twig) at a signiﬁcance level of aFDDDSIFODOS.
For the context ufthis problem, m=ua—u1ud=u27ul where the ﬁrst data set represents a
pre—tzest measure of time on task and the second data set represents a post—test measure
of time on task. W=0Hm pd=0
aﬁwgﬂﬂa: p114) You believe the population of diﬁu'mce scores is normally distributed, but you do not
know the standard deviation. You obtain the following sample ofdala: Dretest Dostite st
42.? —]..6
50.2 67.6
42.3 15.3
53.5 43.9
52 .2 53. 7 50 58.3
41 46.6
44.5 52 What is the test statistic far this sample? (Report answer accurate tn three decimal
places.) test. statistic : What is the 7 alue forthjs sample? (Report answer accurate to four decimal places.)
pvalue : The plalue is...
I (" lessthan(urequaltn)mt
- (" greater than an This test statistic leads to a decision to...
- f‘ reject the null
- (- accept the null - F failtorejectthenull As such, the ﬁnal conclusion is that... - (" There is sufficient evidence to warrant rejection ofthe claim that the mean
diffﬂence ufpostetest from preitesl is less than D. n (- There isnrlt sufﬁcientevidencetowarrantrejectiunaftheclajmthatthe
mean difference [If postimst from pretest is less than 0. n F The sample data support the claim that the mean diffﬂmce ofpnstitest from
pre—test is less than 0. . F There is not suﬁicieut sample evidence In support the claimthat the mean
diﬂ'erence nfpost—mt from pre—test is less than 0.