Question

Answer all parts

Part A. If the null hypothesis states that µD=0 and a researcher obtained a Confidence Interval of CI 95% = (-1.95, 2.10), can the researcher conclude that there is a significant difference between their groups? (Multiple choice.)

a. There is not enough information to answer this question

b. No, because it was only a 95% confidence interval

c. No, because the range include 0

d. Yes, because the range includes 0

Part B.

A research calculates a Cohen’s d of d=0.6. What size effect does this research have?

Group of answer choices

a. Small effect

b. Large effect

c. Medium effect

d. Very small effect

Part C. How do you find a difference score?

Group of answer choices

a. You square the deviations from the mean.

b. You subtract the person’s before score from their after score.

c. You subtract each score from the mean.

d. You add each person’s before and after scores together.

Part D. How many samples do the independent- and repeated-measures t-test each use?

Group of answer choices

a. 2

b. Any number the researcher wants

c. 1

d. 3

Answer #1

The solution to this problem is given by

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...

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...

1.a)A researcher obtains a sample of n= 25 adults who
are between the ages of 65 and 75. The researcher measures
cognitive performance for each individual before and after a
two-month program in which participants receive daily doses of a
blueberry supplement. The results show an average increase in
performance of MD= 8, with SS = 1200.
Does the result support the conclusion that the blueberry
supplement significantly increase cognitive performance? Use a
one-tailed test with α = .01
The...

A researcher obtains a sample of n= 16 adults who are between
the ages of 65 and 75. The researcher measures cognitive
performance for each individual before and after a two-month
program in which participants receive daily doses of a blueberry
supplement. The results show an average increase in performance of
MD= 7.4, with SS = 1215. Does the result support the conclusion
that the blueberry supplement significantly increase cognitive
performance? Use a one-tailed test with α = .05
(A)...

Null hypothesis (H0): The true difference in mean
hemoglobin change for pregnant women not exposed to herbicides
versus those who are somewhat exposed is 0 g/dL.
(µbottle – µboth = 0 g/dL)
Research hypothesis (H1): The true difference in mean
hemoglobin change for pregnant women not exposed to herbicides
versus those who are somewhat exposed is not 0 g/dL.
(µbottle – µboth ≠ 0 g/dL)
SAS Output:
The TTEST Procedure
Variable: change
group
Method
Mean
95% CL Mean
Std Dev...

The ?‑ value for a two‑sided test of the null hypothesis
?0:?=10 is 0.06 .
Question 1: Does the 95% confidence interval include the
value 10 ? Why or why not?
a)No: ?=0.06 indicates that the results observed are significant
at the ?=0.05 level, but this is not enough information to say a
95% confidence interval will include 10 .
b)No: ?=0.06 indicates that the results observed are significant
at the ?=0.05 level, so the 95% confidence interval will not...

Data on the water quality in the eastern United States was
obtained by a researcher who wanted to ascertain whether or not the
amount of particulates in water (ppm) could be accurately used to
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linear regression model:
Qualityi = ? 0 + ? 1 × particulatesi +
? i
where the deviations ?i were assumed to be independent
and Normally distributed with mean 0 and standard deviation
?. This model...

A researcher at a large university is studying the effects of
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the faculty aged 35 to 55 at his university, looking separately at
two groups: The ones that speak at least two
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There are over 400 faculty in each group, and he takes two
independent, simple random samples of 45 individuals, one from each
group for a detailed study. The study consists of a variety of
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Which...

A research team is interested in the effectiveness of hypnosis
in reducing pain. The responses from 8 randomly selected patients
before and after hypnosis are recorded in the table below (higher
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levels 'Pre' and 'Post' hypnosis for 8 subjects
Pre 6.7 7.1 10.2 10.2 9.1 9.6 11.1 7.2
Post 9.5 11.5 11.3 8.4 10.9 10.2 8.4 10.6
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a) Fill...

When is the most appropriate time to calculate power?
A. after you rejected the null in an experiment
B. after you rejected the null in a study
C. when designing an experiment
D. a or b
Your friends calculate a Cohen’s d of -0.45, but they are unsure
of how to interpret it. What would you tell them?
A. They have found a small effect.
B. They have found a medium effect.
C. They have found a large effect.
D....

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