Question

1) In an experiment a researcher wishes to determine if there is a difference in the level of relaxation subjects report while in either a hot or cold bath. He obtains the following scores: Sample 1: (hot) mean = 43, s2x =22.79, n = 15 Sample 2: (hot) mean = 39, s2x =24.6, n = 15 a. Compute the t obtained. b. With an α = .05, what is the tcrit ? c. What do you conclude about relaxation and hot and cold baths? d. compute the confidence interval if necessary e. compute the effect size if necessary

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 a μ = 60 a n d σ = 8
. The individuals in the sample had an average score...

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...

1.- A researcher obtains t = 2.25 for a
repeated-measures study using a sample of n = 10
participants. Based on this t value, what is the correct
decision for a two-tailed test?
a.
Reject the null hypothesis with α = .05 but not with
α = .01
b.
Reject the null hypothesis with both α = .05 and
α = .01
c.
Fail to reject the null hypothesis with both α = .05
and α = .01
d.
Cannot...

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 is testing the effectiveness of a new herbal
supplement that claims to improve memory performance. A
sample of n = 25 college students is obtained and each student
takes the supplement daily for six week. At the end of
the 6-week period, each student is given a standardized memory test
and the average score for the sample is M = 39. For the
general population of college students, the distribution of test
scores is normal with a mean of µ =...

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...

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...

1. Numerous studies have shown that IQ scores have been
increasing, generation by generation, for years. The increase is
called the Flynn Effect, and the data indicate that the increase
appears to be about 7 points per decade. To demonstrate this
phenomenon, a researcher obtains an IQ test that was written in
1980. At the time the test was prepared, it was standardized to
produce a population mean of µ = 100 and σ = 15. The researcher
administers the...

The goal of this experiment was to determine whether there is a
difference between the happiness obtained from “material” versus
“experiential” purchases (following the study of Van Boven &
Gilovich, 2003). For our purposes, we’ll treat the “material” group
as the control group, and ask whether the “experiential” group
differed in their happiness rating.
Again, the population mean was µ = 6.16 happiness, with standard
deviation σ = 1.71. We collected a sample of n =
34 students in the...

A medical researcher wants to determine whether there is a
difference in the mean length of time it takes three types of pain
relievers to provide relief from headache pain. Several headache
sufferers are randomly selected and given one of the three
medications. Each headache sufferer records the time (in minutes)
it takes the medication to begin working. The results are shown in
the table. At a α = 0.01, can you conclude that the mean times are
different? Assume...

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