Question 1

If the scores on a test are normally distributed,what percentage will be within two standard deviations of the mean?

Accepted Answer

A) 50 
B) 68 
C) 95 
D) 99

Question 2

Descriptive statistics deal with whether or not a statistically significant difference exists.

Accepted Answer

A) True 
 B)False

Question 3

Many statistical analyses are based on the assumption that the data are distributed normally.

Accepted Answer

A) True 
 B)False

Question 4

Hypothesis testing is a function of inferential statistics.

Accepted Answer

A) True 
 B)False

Question 5

Which correlation is used when there are two ordinal variables?

Accepted Answer

A) Pearson product moment 
B) Spearman rank order 
C) point biserial 
D) Tukey

Question 6

Data transformation involves modifying data so they are more consistent with the theory.

Accepted Answer

A) True 
 B)False

Question 7

Describe the phenomenon of fishing and explain how it is related to error.

Accepted Answer

The answer of Describe the phenomenon of fishing and explain...

Question 8

Alan has developed an intervention that can be used by family resource networks to provide basic child development information to high-risk families.Although he has trained at least one person from each family resource network and has excellent program documentation,he is still concerned.Specifically,Alan is probably worried about ____.

Accepted Answer

A) low reliability of the measure 
B) random heterogeneity of participants 
C) poor reliability of treatment implementation 
D) random irrelevancies in the setting

Question 9

The problem known as _______________ occurs when multiple analyses are conducted and they are treated as independent.

Accepted Answer

The answer of The problem known as _______________ occurs when...

Question 10

The ____ is commonly called the average.

Accepted Answer

A) mean 
B) median 
C) mode 
D) range

Question 11

The branch of statistics that allows researchers to test their hypotheses is called ____ statistics.

Accepted Answer

A) causal 
B) descriptive 
C) inferential 
D) deductive

Question 12

Identify and describe the major potential sources of noise in research.

Accepted Answer

The answer of Identify and describe the major potential sources...

Question 13

What is the mode of this set of scores?
4,4,7,3,6,10,2,7,3,10,4,8,2,2,2

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 10

Question 14

The ____ is the spread of the scores around their average in a single sample.

Accepted Answer

A) dispersion 
B) standard deviation 
C) variance 
D) range

Question 15

Robb carefully designed a study to test a method for reducing test anxiety among students.On the day he conducts his post-test,a broken water main nearby results in jack hammering and other construction sounds that are seem to be distracting research participants.Robb's ability to detect differences among his groups may have been compromised by ____.

Accepted Answer

A) low reliability of the measure 
B) random heterogeneity of participants 
C) poor reliability of treatment implementation 
D) random irrelevancies in the setting

Question 16

The probability that the researcher will conclude there is a relationship when in fact there is one is referred to as statistical _______________.

Accepted Answer

The answer of The probability that the researcher will conclude...

Question 17

The _______________ is the score found at the exact middle of the set of values.

Accepted Answer

The answer of The _______________ is the score found at...

Question 18

Data preparation involves making graphs that show the distributions of the data.

Accepted Answer

A) True 
 B)False

Question 19

A weak intervention can result in increased risk of ____.

Accepted Answer

A) Type I error only 
B) Type II error only 
C) both Type I and Type II errors 
D) neither Type I nor Type II error

Question 20

If data on a particular variable are skewed in the positive direction,then taking the square root can make the data look closer to a normal distribution.This is referred to as data ____.

Accepted Answer

A) transformation 
B) translation 
C) imputation 
D) substitution

Exam 11: Introduction to Data Analysis

If the scores on a test are normally distributed,what percentage will be within two standard deviations of the mean?

Descriptive statistics deal with whether or not a statistically significant difference exists.

Many statistical analyses are based on the assumption that the data are distributed normally.

Hypothesis testing is a function of inferential statistics.

Which correlation is used when there are two ordinal variables?

Data transformation involves modifying data so they are more consistent with the theory.

Describe the phenomenon of fishing and explain how it is related to error.

The problem known as _______________ occurs when multiple analyses are conducted and they are treated as independent.

The ____ is commonly called the average.

The branch of statistics that allows researchers to test their hypotheses is called ____ statistics.

Identify and describe the major potential sources of noise in research.

What is the mode of this set of scores? 4,4,7,3,6,10,2,7,3,10,4,8,2,2,2

The ____ is the spread of the scores around their average in a single sample.

The probability that the researcher will conclude there is a relationship when in fact there is one is referred to as statistical _______________.

The _______________ is the score found at the exact middle of the set of values.

Data preparation involves making graphs that show the distributions of the data.

A weak intervention can result in increased risk of ____.

If data on a particular variable are skewed in the positive direction,then taking the square root can make the data look closer to a normal distribution.This is referred to as data ____.