You ask a group of 10 adults to participate in a reaction time
task concerning verbal
comprehension while under the influence of a low dose of
amphetamine (one of a variety of “speed” drugs, or central nervous
system stimulants). The history of research indicates that
performance on many tasks actually improves with low doses, but
with higher doses, performance deteriorates). You record the
following comprehension times (in seconds) required to identify the
two meanings of ambiguous sentences, such as, “The mayor asked the
police to stop drinking” or “The children ran in the house.” You
hypothesize that the low dose of amphetamine will speed up the
participants’ comprehension times (you expect faster/smaller time
scores with a low dose of amphetamine, that is). The mean
comprehension time on this task for persons who have not ingested
any form of stimulant drug is µ = 1.4 seconds
X
(comprehension time, in seconds)
1.1
0.8
1.1
0.7
0.9
1.0
1.3
1.2
1.4
0.8
Which hypothesis test needs to be employed here, the z test or the one-sample t test?
A. z test
B. one-sample t test
Option B) is correct.
B. one-sample t test
We have given sample data and sample size less than 30.
Also population standard deviation not known.
You ask a group of 10 adults to participate in a reaction time task concerning verbal...
You ask a group of 10 adults to participate in a reaction time task concerning verbal comprehension while under the influence of a low dose of amphetamine (one of a variety of “speed” drugs, or central nervous system stimulants). The history of research indicates that performance on many tasks actually improves with low doses, but with higher doses, performance deteriorates). You record the following comprehension times (in seconds) required to identify the two meanings of ambiguous sentences, such as, “The...