Question 7 2 points Which of the following is most clearly a

Question 7 (2 points)

Which of the following is most clearly a statement about a statistical relationship between variables?

Question 7 options:

About one-third of Americans have a psychological disorder at some time in their lives.

“Pain-Away” is more effective at treating headaches than its nearest competitor.

Prejudice continues to be a significant problem in this country.

The average score on the Stanford-Binet Intelligence Scale is 100 points.

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Question 8 (2 points)

What is the main reason researchers perform null hypothesis testing?

Question 8 options:

So they can use statistics to test the null hypothesis.

To decide how strong a sample relationship is.

To decide whether a relationship that exists in a sample represents a real relationship in the population.

To decide whether the independent variable caused changes in the dependent variable.

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Question 9 (2 points)

Dr. Kerry conducted a study which found a “statistically significant” relationship between the number of books children read at home during the year and their overall GPA in school. The result is based on a sample of 20,000 children. Which of the following is true?

Question 9 options:

The relationship must be a causal one.

The relationship could be extremely weak.

The relationship is extremely strong.

Dr. Kerry failed to reject the null hypothesis.

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Question 10 (2 points)

What does it mean if the result of your study is “not statistically significant”?

Question 10 options:

You reject the null hypothesis.

The result represents a \"real\" result that is true in the population.

The result is unimportant.

The result may be due to sampling error.

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Question 11 (2 points)

Dr. Sanjay analyzed data he collected from elderly adults who were trying a new medication to treat dementia. Some received the real drug while others received a placebo in this double-blind study. When Dr. Sanjay conducted an independent t test on this data, he calculated an actual t value of 2.36 and found the critical t value was 1.725. Which of the following is true?

Question 11 options:

He should reject the null hypothesis.

He should not reject the null hypothesis.

He should have conducted a paired-samples t test.

His p value is greater than .05.

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Question 12 (2 points)

When a study lacks statistical power, the researcher is in danger of which of the following?

Question 12 options:

Committing a Type I error.

Committing a Type II error.

Committing a sampling error.

Committing both a Type I and Type II error.

	a) About one-third of Americans have a psychological disorder at some time in their lives.
	b) “Pain-Away” is more effective at treating headaches than its nearest competitor.
	c) Prejudice continues to be a significant problem in this country.
	d) The average score on the Stanford-Binet Intelligence Scale is 100 points.

Solution

7.

OPTION B: “Pain-Away” is more effective at treating headaches than its nearest competitor. [ANSWER]

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8.

OPTION A: So they can use statistics to test the null hypothesis. [ANSWER]

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9.

OPTION C: The relationship is extremely strong. [ANSWER]

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