Question 1

On a normal curve,95 percent of all the cases would be found between which two standard deviations (SDs)?

Accepted Answer

A) 0 and +3 
B) -1 and +1 
C) -2 and +2 
D) -3 and +3 
A) 0 and +3 
B) -1 and +1 
C) -2 and +2 
D) -3 and +3

Question 2

A perfect negative relationship has a coefficient of correlation of

Accepted Answer

A) 0.00 
B) +1.00 
C) -1.00 
D) none of these. 
A) 0.00 
B) +1.00 
C) -1.00 
D) none of these.

Question 3

If the mean on a test is 100 and the standard deviation is 15,a person with a z-score of +1.0 scored which of the following on the test?

Accepted Answer

A) 70 
B) 85 
C) 115 
D) 130 
A) 70 
B) 85 
C) 115 
D) 130

Question 4

In order to gain greater confidence that a cause-and-effect relationship exists,which of the following must be performed?

Accepted Answer

A) experiment 
B) correlational study 
C) Pearson r 
D) case study 
A) experiment 
B) correlational study 
C) Pearson r 
D) case study

Question 5

A bar graph of a frequency distribution is known as a(n) _______.

Accepted Answer

The answer of A bar graph of a frequency distribution...

Question 6

If the mean of a test is 80 and the standard deviation is 10,a person with a z-score of -2.0 on a test scored
__________.

Accepted Answer

The answer of If the mean of a test is...

Question 7

A researcher studies the effect of a new therapy on a small group of hyperactive children in the hopes of generalizing these findings for use with all hyperactive children.This researcher is using _______ statistics.

Accepted Answer

The answer of A researcher studies the effect of a...

Question 8

If one calculates a correlation of -1.20,this coefficient indicates that a

Accepted Answer

A) perfect negative relationship exists. 
B) moderately strong relationship exists. 
C) weak correlation exists. 
D) miscalculation has occurred. 
A) perfect negative relationship exists. 
B) moderately strong relationship exists. 
C) weak correlation exists. 
D) miscalculation has occurred.

Question 9

Regarding two variables of interest,a correlation will tell us only the degree of

Accepted Answer

A) causation. 
B) influence one variable has on the other. 
C) spread,or variability,between the two variables. 
D) the relationship between the two variables. 
A) causation. 
B) influence one variable has on the other. 
C) spread,or variability,between the two variables. 
D) the relationship between the two variables.

Question 10

Representativeness as it refers to a sample means

Accepted Answer

A) the sample is as large as the population. 
B) the sample group reflects the characteristics of the larger population. 
C) each member of the sample has an equal chance of being picked. 
D) the sample group is equally divided between males and females. 
A) the sample is as large as the population. 
B) the sample group reflects the characteristics of the larger population. 
C) each member of the sample has an equal chance of being picked. 
D) the sample group is equally divided between males and females.

Question 11

Wendy has determined that the correlation between her reading screening test and her students' reading grades is .30.What percent of the variation in reading scores is accounted for by knowing the students' scores on the
Screening test?

Accepted Answer

A) 9 
B) 30 
C) 60 
D) 90 
A) 9 
B) 30 
C) 60 
D) 90

Question 12

Results of an experiment that have a chance probability of .05 are usually regarded as statistically significant.

Accepted Answer

A) True 
 B)False

Question 13

A coefficient of correlation that is close to zero indicates a _______ relationship.

Accepted Answer

A) perfect 
B) strong 
C) moderate 
D) weak 
A) perfect 
B) strong 
C) moderate 
D) weak

Question 14

Which type of statistics are used to summarize large amounts of data so that they become more meaningful and easier to communicate to others?

Accepted Answer

A) descriptive 
B) inferential 
C) nominal 
D) ordinal 
A) descriptive 
B) inferential 
C) nominal 
D) ordinal

Question 15

If one wants to find the median of an even number of scores,one

Accepted Answer

A) selects one of the two middle scores as the median. 
B) lists both middle scores as the median. 
C) averages the two scores that "share" the middle spot. 
D) cannot calculate a median on an even number of scores. 
A) selects one of the two middle scores as the median. 
B) lists both middle scores as the median. 
C) averages the two scores that "share" the middle spot. 
D) cannot calculate a median on an even number of scores.

Question 16

Measures of variability

Accepted Answer

A) present numbers in a pictorial format. 
B) describe a "typical" score in a distribution. 
C) allow one to generalize from small samples. 
D) indicate how scores differ from each other. 
A) present numbers in a pictorial format. 
B) describe a "typical" score in a distribution. 
C) allow one to generalize from small samples. 
D) indicate how scores differ from each other.

Question 17

Regarding samples,which of the following statements is FALSE?

Accepted Answer

A) Samples are cross-sections of a population. 
B) Samples are used to draw conclusions about larger groups. 
C) Inferential statistics are often applied to samples. 
D) Samples are often too difficult to obtain for research. 
A) Samples are cross-sections of a population. 
B) Samples are used to draw conclusions about larger groups. 
C) Inferential statistics are often applied to samples. 
D) Samples are often too difficult to obtain for research.

Question 18

Professor Waters calculated the mean,median,and mode of the scores made on the midterm exam.These descriptive statistics are known as the measures of _______.

Accepted Answer

The answer of Professor Waters calculated the mean,median,and mode of...

Question 19

Vertical bars are used to indicate the frequencies within a frequency polygon.

Accepted Answer

A) True 
 B)False

Question 20

A correlational study would be used to determine if a relationship existed between rainfall levels and crime rates.

Accepted Answer

A) True 
 B)False

Exam 81: Understanding Descriptive and Inferential Statistics for Psychological Research

On a normal curve,95 percent of all the cases would be found between which two standard deviations (SDs)?

A perfect negative relationship has a coefficient of correlation of

If the mean on a test is 100 and the standard deviation is 15,a person with a z-score of +1.0 scored which of the following on the test?

In order to gain greater confidence that a cause-and-effect relationship exists,which of the following must be performed?

A bar graph of a frequency distribution is known as a(n) _______.

If the mean of a test is 80 and the standard deviation is 10,a person with a z-score of -2.0 on a test scored __________.

A researcher studies the effect of a new therapy on a small group of hyperactive children in the hopes of generalizing these findings for use with all hyperactive children.This researcher is using _______ statistics.

If one calculates a correlation of -1.20,this coefficient indicates that a

Regarding two variables of interest,a correlation will tell us only the degree of

Representativeness as it refers to a sample means

Wendy has determined that the correlation between her reading screening test and her students' reading grades is .30.What percent of the variation in reading scores is accounted for by knowing the students' scores on the Screening test?

Results of an experiment that have a chance probability of .05 are usually regarded as statistically significant.

A coefficient of correlation that is close to zero indicates a _______ relationship.

Which type of statistics are used to summarize large amounts of data so that they become more meaningful and easier to communicate to others?

If one wants to find the median of an even number of scores,one

Measures of variability

Regarding samples,which of the following statements is FALSE?

Professor Waters calculated the mean,median,and mode of the scores made on the midterm exam.These descriptive statistics are known as the measures of _______.

Vertical bars are used to indicate the frequencies within a frequency polygon.

A correlational study would be used to determine if a relationship existed between rainfall levels and crime rates.

Introduction

How to Study Psychology

Introducing Psychology: Psychology, Critical Thinking, and Science

Introducing Psychology: Psychology Then and Now

Introducing Psychology: the Psychology Experiment

Introducing Psychology: Non-Experimental Research Methods

Psychology in Action: Thinking Critically About the Media

Brain and Behavior: Neurons and the Nervous System

Brain and Behavior: Brain Research

Brain and Behavior: Hemispheres and Lobes of the Cortex

Brain and Behavior: Sub-Cortex and Endocrine System

Psychology in Action: Handedness

Human Development: Heredity and Environment

Human Development: Emotional and Social Development in Childhood

Human Development: Language and Cognitive Development in Childhood

Human Development: Adolescence and Adulthood

Psychology in Action: Well-Being and Happiness

Sensation and Perception: Sensory Processes

Sensation and Perception: Vision

Sensation and Perception: The Other Senses

Sensation and Perception: Perceptual Processes

Sensation and Perception: Perception and Objectivity

Psychology in Action: Extrasensory Perception

Consciousness: States of Consciousness

Consciousness: Sleep and Dreams

Consciousness: Psychoactive Drugs

Psychology in Action: Exploring and Using Dreams

Conditioning and Learning: Types of Learning

Conditioning and Learning: Classical Conditioning

Conditioning and Learning: Operant Conditioning

Conditioning and Learning: Reinforcement and Punishment

Psychology in Action: Behavioral Self-Management

Memory: Memory Systems

Memory: Forgetting

Memory: Exceptional Memory and Improving Memory

Psychology in Action: Mnemonics

Cognition and Intelligence: Imagery, Concepts, and Language

Cognition and Intelligence: Problem Solving

Cognition and Intelligence: Creative Thinking and Intuition

Cognition and Intelligence: Intelligence

Psychology in Action: Enhancing Creativity

Motivation and Emotion: Overview of Motives and Emotions

Motivation and Emotion: Motivation in Detail

Motivation and Emotion: Emotion in Detail

Psychology in Action: Emotional Intelligence

Human Sexuality: Sexual Development and Orientation

Human Sexuality: Gender Development, Androgyny, and Gender Variance

Human Sexuality: Sexual Behavior, Response, and Attitudes

Psychology in Action: Sexual Problems

Personality: Overview of Personality

Personality: Trait Theories

Personality: Psychoanalytic and Humanistic Theories

Personality: Behavioral and Social Learning Theories

Psychology in Action: Understanding Shyness

Health, Stress, and Coping: Health Psychology

Health, Stress, and Coping: Stress, Frustration, and Conflict

Health, Stress, and Coping: Defenses, Helplessness, and Depression

Health, Stress, and Coping: Stress and Health

Psychology in Action: Stress Management