Homework SourseA sample is obtained from a population with 100 and 20 Whi
A sample is obtained from a population with = 100 and = 20. Which of the following samples would produce the most extreme z-score?
a.
A sample of n = 25 scores with M = 102
b.
A sample of n = 100 scores with M = 102
c.
A sample of n = 25 scores with M = 104
d.
A sample of n = 100 scores with M = 104
A hypothesis test involves a comparison of which two elements?
a.
Research results from a sample and a hypothesis about a population
b.
Research results from a population and a hypothesis about a sample
c.
Research results from a population and a hypothesis about the population
d.
Research results from a sample and a hypothesis about the sample
A researcher selects a sample and administers a treatment to the individuals in the sample. If the sample is used for a hypothesis test, what does the alternative hypothesis (H1) say about the treatment?
a.
The treatment causes a change in the scores.
b.
The treatment adds a constant to each score.
c.
The treatment multiplies each score by a constant.
d.
The treatment has no effect on the scores.
| a. | A sample of n = 25 scores with M = 102 |
| b. | A sample of n = 100 scores with M = 102 |
| c. | A sample of n = 25 scores with M = 104 |
| d. | A sample of n = 100 scores with M = 104 |
Solution
1.
As
z = (x - u) * sqrt(n)/ sigma
Then
option a: z = 0.50
option b: z = 1
option c: z = 1
option d: z = 2 [ANSWER, OPTION D]
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2.
B. Research results from a population and a hypothesis about a sample
[we don\'t know the sample yet, that\'s why we hypothesize about it]
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3.
We claim that the treatment changes the scores, but we don\'t say how.
Thus, it is
A. The treatment causes a change in the scores. [ANSWER]
