Question

A researcher used an independent sample t test to compare two treatment conditions. He wanted to test whether there is a significant difference between two treatments. Following data were obtained:

Treatment one group: # of participants = 12, sample mean = 55, sample standard dev (s) = 2.83

Treatment two group: # of participants = 12, sample mean = 52, sample standard dev (s) = 2.00

Use 5% significance level.
Assume µ_{1}
and µ_{2} are the population means for group one
and two respectively.

a) What is null and alternative hypotheses?

b) What is the value of the test statistic?

c) What is the *p*-value?

d) What is your conclusion?

Answer #1

A researcher used an independent sample t test to
compare two treatment conditions. He wanted to test whether there
is a significant difference between two treatments. Following data
were obtained:
Treatment one group: # of participants = 12, sample
mean = 55, sample standard dev (s) = 2.83
Treatment two group: # of participants = 12, sample
mean = 52, sample standard dev (s) = 2.00
Use 5% significance level. Assume µ1
and µ2 are the population means for group...

Questions 7 to 13 are based on the following problem A
researcher used a sample of n =16 adults between the ages of 40 and
45. For each person, the researcher recorded the difference between
the ratings obtained while smiling and the rating obtained while
frowning. On average the cartoons were rated as funnier when the
participants were smiling, with an average difference of MD = 1.6,
with SS = 135. Are the cartoons rated as significantly funnier when
the...

1a)
A researcher used a sample of n =16 adults
between the ages of 40 and 45. For each person, the researcher
recorded the difference between the ratings obtained while smiling
and the rating obtained while frowning. On average the cartoons
were rated as funnier when the participants were smiling, with an
average difference of MD = 1.6, with
SS = 135.
Are the cartoons rated as significantly funnier when the
participants are smiling ? Use a one-tailed test with...

A researcher wished to compare the average daily hotel room
rates between San Francisco and Los Angeles. The researcher
obtained an SRS of 15 hotels in downtown San Francisco and found
the sample mean x1=$156 , with a standard deviation s1= $15 . The
researcher also obtained an independent SRS of 10 hotels in
downtown Los Angeles and found the sample mean x2= $143, with a
standard deviation s2=$10.
Let 1 and 2 represent the mean cost of the populations...

1. A researcher is comparing scores from two treatment groups
using independent samples t test. Use a Hartley’s
F-max test to examine this assumption (each group has 6
participants, s2 in group 1 is 20, and s2 in
group 2 is 15, set alpha level at .05). Also, how should this
researcher estimate the standard error in the independent samples
t test?

The following data are from an independent-measures experiment
comparing two treatment
conditions. Treatment
1 Treatment
2
4 19
5 11
12 18
10 10
10
12
7
14
(a) Calculate the mean for Treatment 1 and Treatment 2
(b) What is the Pooled Sample variance?
© What is the estimated standard error?
(d) Do these data indicate a significant difference between the
treatments at the .05 level of significance?
(e) Compute r2 to measure the...

A t-test is generally used to analyze data with _____
level(s), and an ANOVA is generally used to analyze data with _____
level(s).
a.
less than two; more than two
b.
one; one or more
c.
two; more than two
d.
more than two; two
If you examined the effect of studying 0, 1, or 2 hours a day on
grades, how would you write
the null hypothesis?
a.
µD = 0
b. ...

A researcher performed a independent sample t test to
test whether population mean of one group is more than the the
other. After taking random sample from both groups he calculated
the p-value. It was 0.0345. He changed his mind and decided to test
for difference of means in two populations. What is the new p-
value?
a.
0.0345
b.
0.01725
c.
0.069
d.
Cannot determine from given information.

The following scores are from an independent-measures study
comparing two treatment conditions. (Be sure to include your
critical values)
a. Use an independent -measures t-test with a = 0.05 to
determine whether there is a significant mean difference between
the two treatments.
b. Use an ANOVA with a = 0.05 to determine whether there is a
significant mean difference between the two treatments. You should
find that F = t2.
Treatment I
Treatment II
10
7
N = 16
8...

The following data represent the results from an
independent-measures experiment comparing three treatment
conditions. Use a spreadsheet to conduct an analysis of variance
with α=0.05α=0.05 to determine whether these data are sufficient to
conclude that there are significant differences between the
treatments.
Treatment A
Treatment B
Treatment C
12
12
16
12
11
18
12
13
15
11
14
17
13
15
19
F-ratio =
p-value =
The results obtained above were primarily due to the mean for
the third...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 4 minutes ago

asked 22 minutes ago

asked 28 minutes ago

asked 30 minutes ago

asked 39 minutes ago

asked 59 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago