Question

A researcher would like to determine whether an over-the-counter cold medication has an effect on mental alertness. A sample of n = 16 participants is obtained and each person is given a standard dose of the medication one hour before being tested in a driving simulation task. For the general population, scores on the simulation task are normally distributed with a μ = 60 a n d σ = 8 . The individuals in the sample had an average score of M = 56.5.

a. Can the researcher conclude that scores on the driving simulation task are significantly different after taking the medication? Use a two-tailed test with an α = .05 .

b. Can the researcher conclude that scores on the driving simulation task are significantly lower after taking the medication? Use a one-tailed test with α = .05 .

c. Compute Cohen's d to measure the size of the effect.

Answer #1

A researcher would like to determine whether an over-the-counter
cold medication has an effect on mental alertness. A sample of n =
16 participants is obtained, and each person is given a standard
dose of the medication one hour before being tested in a driving
simulation task. For the general population, scores on the
simulation task are normally distributed with μ = 60 and σ = 8. The
average score in the sample was M = 63.
Can the researcher...

A researcher would like to determine whether an
over-the-counter cold medication has an effect on mental
alertness. A sample of n = 16 participants is obtained,
and each person is given a standard dose of the medication one hour
before being tested in a driving simulation task. For
the general population, reaction time scores on the simulation task
are normally distributed with μ = 210 and σ = 20. The
individuals in the sample had an average score of M = 222.
a....

A researcher would
like to determine whether caffeine has an effect on mental
alertness after sleep deprivation. A sample of n = 25
participants is obtained, and each person is given a cup of coffee,
after one night of total sleep deprivation, one hour before being
tested in a driving simulation task. For the general population
with one night of losing sleep, scores on the simulation task are
normally distributed with μ = 66. The individuals in the
sample had...

Identify the appropriate statistical test for each research
description:
Single-sample z-test
Single-samplet-test
Independent samples t-test
Related samples t-test (repeated measures or matched
samples)
Correlation
A researcher would like to determine whether an over-the-counter
cold medication has an effect on mental alertness. A sample of n =
16 participants is obtained, and each person is given a standard
dose of the medication one hour before being tested in a driving
simulation task. For the general population, scores on the
simulation task...

A researcher wants to examine the effect of new allergy
medication on mental alertness. A sample of n = 16 college students
is selected to the study. Each participant is given a normal dose
of the medicine and thirty minutes later, each student's alertness
is measured on a video game that requires careful attention and
quick decision making. The results show that the sample mean
alertness score is M = 39 with the standard deviation s = 18.
Assuming that...

A researcher would like to evaluate the effect of a new cold
medication on reaction time. It is known that under regular
circumstances the distribution of reaction times is normal with µ =
200. A sample of n = 9 participants is obtained. Each
person is given the new cold medication, and 1 hour later reaction
time is measured for each individual. The average reaction time for
this sample is M = 206 with SS = 648. The
researcher would...

A
researcher asks whether a cold medication interferes with
cognition. A standardized test containing a variety of
problem-solving tasks is normally distributed with μ = 64. A random
sample of n = 25 subjects is given the drug and then tested (M =
57, SD=9). Does the data show that the medication decreases
performance in a one-tail, one-sample t test (α’ =.05)?

In a study examining the effect of caffeine on response time in
the driving simulator, researchers measured reaction time 30
minutes after participants consumed one 6-ouncee cup of coffee.
Using a driving simulation task, for which the distribution of
reaction time is normal with m=400 and s=40, they obtained a mean
of M=392 for a sample of n=36 participants.
a. Are the data sufficient to conclude that caffeine has a
significant effect on reaction time? Use a two-tailed test with...

A researcher investigates whether a new medication produces
enough sedation to impair mental functioning. It is known that
scores on a standardized test containing a variety of problem
-solving tasks are normally distributed with μ = 64 and σ= 8.
Higher scores on the tasks are associated with higher levels of
mental functioning. A random sample of n = 12 subjects is
given the drug and then tested. For this sample, the mean is
M = 58. Does the drug...

A researcher wants to determine whether or not a given drug has
any effect on the scores of human subjects performing a task of
psychomotor coordination. The 9 subjects in Group A (Experimental
Group) received an oral administration of the drug prior to being
tested. Ten subjects in Group B (Control Group) received a placebo
at the same time. The results of the experiment are shown
below:
Group A
Group B
12
21
14
18
10
14
8
20
16...

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