results, one might theorize that the same antioxi- dants might also benefit elderly humans. Suppose a researcher is interested in testing this theory. The researcher obtains a sample of n = 16 adults who are older than 65, and gives each participant a daily dose of a blueberry supplement that is very high in antioxi- dants. After taking the supplement for 6 months, the participants are given a standardized cognitive skills test and produce a mean score of M = 50.2. For the general population of elderly adults, scores on the test average 45 and forma normal distribution with o =9 a. Can the researcher conclude that the supplement has a significant effect on cognitive skill? Use a two-tailed test with a = .05 b. Compute Cohen's d for this study. c. Write a sentence demonstrating how the outcome of the hypothesis test and the measure of effect size would appear in a research report. (Liguori of caf- In a ne ce cup for with of e has - it h- 19. A researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population with a mean of u= 40 and a standard deviation of o = 12. The researcher expects a 6-point f 266 CHAPTER 8 | Introduction to Hypothesis Testing and pl treatment effect and plans to use a two-tailed hypoth- esis test with a= .05 n 2 ago, t ized d a. Compute the power of the test if the researcher uses a sample of n =9 individuals. (See Example 8.6.) b. Compute the power of the test if the researcher uses a sample of n 16 individuals. stand а 7-р 10 y for 20. A researcher plans to conduct an experiment evalu- ating the effect of a treatment. A sample of n=9 participants is selected and each person receives the treatment before being tested on a standardized dex- terity task. The treatment is expected to lower scores on the test by an average of 30 points. For the regular poulation, scores on the dexterity task form a normal distribution with u = 240 and o 30. a. If the researcher uses a two-tailed test with а. b. 22. В a = .05, what is the power of the hypothesis test? b. Again assuming a two-tailed test with o = .05, what is the power of the hypothesis test if the sample size is increased to n = 25? 21. Research has shown that IQ scores have been increas- ing for years (Flynn, 1984, 1999). The phenomenon is called the Flynn effect and the data indicate that the increase appears to average about 7 points per decade. To examine this effect, a researcher obtains an IQ test 23. structions for scoring
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
Number 19.
![results, one might theorize that the same antioxi-
dants might also benefit elderly humans. Suppose
a researcher is interested in testing this theory. The
researcher obtains a sample of n = 16 adults who are
older than 65, and gives each participant a daily dose
of a blueberry supplement that is very high in antioxi-
dants. After taking the supplement for 6 months, the
participants are given a standardized cognitive skills
test and produce a mean score of M = 50.2. For the
general population of elderly adults, scores on the test
average 45 and forma normal distribution with
o =9
a. Can the researcher conclude that the supplement
has a significant effect on cognitive skill? Use a
two-tailed test with a = .05
b. Compute Cohen's d for this study.
c. Write a sentence demonstrating how the outcome
of the hypothesis test and the measure of effect
size would appear in a research report.
(Liguori
of caf-
In a
ne
ce cup
for
with
of
e has
-
it
h-
19. A researcher is evaluating the influence of a treatment
using a sample selected from a normally distributed
population with a mean of u= 40 and a standard
deviation of o = 12. The researcher expects a 6-point
f](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6ef18636-51a3-400c-9360-e456e89122c8%2F25f37eb4-39c5-4b37-ac99-13ef58721737%2Fzf7hdqq.jpeg&w=3840&q=75)
![266
CHAPTER 8 | Introduction to Hypothesis Testing
and pl
treatment effect and plans to use a two-tailed hypoth-
esis test with a= .05
n 2
ago, t
ized d
a. Compute the power of the test if the researcher uses
a sample of n =9 individuals. (See Example 8.6.)
b. Compute the power of the test if the researcher
uses a sample of n 16 individuals.
stand
а 7-р
10 y
for
20. A researcher plans to conduct an experiment evalu-
ating the effect of a treatment. A sample of n=9
participants is selected and each person receives the
treatment before being tested on a standardized dex-
terity task. The treatment is expected to lower scores
on the test by an average of 30 points. For the regular
poulation, scores on the dexterity task form a normal
distribution with u = 240 and o 30.
a. If the researcher uses a two-tailed test with
а.
b.
22. В
a = .05, what is the power of the hypothesis test?
b. Again assuming a two-tailed test with o = .05,
what is the power of the hypothesis test if the
sample size is increased to n = 25?
21. Research has shown that IQ scores have been increas-
ing for years (Flynn, 1984, 1999). The phenomenon
is called the Flynn effect and the data indicate that the
increase appears to average about 7 points per decade.
To examine this effect, a researcher obtains an IQ test
23.
structions for scoring](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6ef18636-51a3-400c-9360-e456e89122c8%2F25f37eb4-39c5-4b37-ac99-13ef58721737%2F6ax4lt.jpeg&w=3840&q=75)
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