Exam 6: Probability, Normal Distributions, and Z Scores

In a normal distribution,the probability of a score above the mean is larger than the probability of a score between first standard deviation above and below the mean.

(True/False)

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Question 41

A binomial probability distribution is the distribution of random outcomes for a bivariate or dichotomous random variable.

(True/False)

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Question 42

A researcher records the following number of birdcalls made during an experimental session with robins: 7.2 0.6 (M SD).Assuming these data are normally distributed,what is the probability that robins made more than 9 birdcalls during this experimental session?

(Multiple Choice)

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Question 43

The closer a z score is to 0,the smaller the area is under the normal curve toward the tails.

(True/False)

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Question 44

State whether the first area is bigger,the second area is bigger,or the two areas are equal: the area to the right of the mean,or the area between z = ±1.00.

(Multiple Choice)

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Question 45

What is the z score for scores in the top 2.5%?

(Multiple Choice)

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Question 46

A researcher records the following times (in seconds)that it took a group of mice to complete a maze: 23 4.1 (M SD).The top 10% of mice finishing with the fastest times will be placed in a "maze bright" group.What is the cutoff time to be placed in this group?

(Multiple Choice)

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Question 47

An assumption of normality is largely used for statistical inference and theory.

(True/False)

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Question 48

In a normal distribution,the mean can only take on positive values.

(True/False)

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Question 49

A researcher records the following time spent sleeping per night (in hours)in a group of participants: 5.8 1.8 (M SD).The researcher decides to categorize participants who sleep between 6 to 8 hours as moderate sleepers.What percentage of participants fell in this category?

(Multiple Choice)

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Question 50

Data were normally distributed as 3.6 0.6 (M SD).Hence,69.15% of data occurred below a score of 3.9 in this distribution.

(True/False)

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Question 51

A researcher selected data that were normally distributed,and appropriately concluded that about 68.26% of scores occurred within one standard deviation of the mean.

(True/False)

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Question 52

What is the z score for scores in the bottom 5%?

(Multiple Choice)

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Question 53

A researcher records the following body mass index (BMI)scores for a group of participants: 28.4 1.6 (M SD).Participants who score between 25 and 30 on this scale are categorized as overweight.What percentage of participants fell in this category?

(Multiple Choice)

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Question 54

For a set of data with 25±2.5,at least 95% of scores fall between 20 and 30.

(True/False)

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Question 55

Two normal distributions are observed.The first distribution has a mean of 12 and a standard deviation of 2.The second distribution has a mean of 0 and a standard deviation of 2.For which distribution will the z score for the mean be larger?

(Multiple Choice)

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Question 56

In a normal distribution,the probability of a score above -1.0 SD is equal to the probability of a score below +1.0 SD.

(True/False)

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Question 57

State whether the first area is bigger,the second area is bigger,or the two areas are equal: the area to the left of z = 1.00,or the area to the left of z = -1.00.

(Multiple Choice)

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Question 58

A researcher records the following assessment data: 42 6 (M SD).The researcher only wants to sample participants scoring in the top 20% of this assessment.What is the cutoff score for the top 20% in this example?

(Multiple Choice)

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Question 59

The unit of measurement distributed along the x-axis of a standard normal distribution is referred to as a

(Multiple Choice)

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Question 60

Showing 41 - 60 of 80

In a normal distribution,the probability of a score above the mean is larger than the probability of a score between first standard deviation above and below the mean.

A binomial probability distribution is the distribution of random outcomes for a bivariate or dichotomous random variable.

A researcher records the following number of birdcalls made during an experimental session with robins: 7.2 0.6 (M SD).Assuming these data are normally distributed,what is the probability that robins made more than 9 birdcalls during this experimental session?

The closer a z score is to 0,the smaller the area is under the normal curve toward the tails.

State whether the first area is bigger,the second area is bigger,or the two areas are equal: the area to the right of the mean,or the area between z = ±1.00.

What is the z score for scores in the top 2.5%?

A researcher records the following times (in seconds)that it took a group of mice to complete a maze: 23 4.1 (M SD).The top 10% of mice finishing with the fastest times will be placed in a "maze bright" group.What is the cutoff time to be placed in this group?

An assumption of normality is largely used for statistical inference and theory.

In a normal distribution,the mean can only take on positive values.

A researcher records the following time spent sleeping per night (in hours)in a group of participants: 5.8 1.8 (M SD).The researcher decides to categorize participants who sleep between 6 to 8 hours as moderate sleepers.What percentage of participants fell in this category?

Data were normally distributed as 3.6 0.6 (M SD).Hence,69.15% of data occurred below a score of 3.9 in this distribution.

A researcher selected data that were normally distributed,and appropriately concluded that about 68.26% of scores occurred within one standard deviation of the mean.

What is the z score for scores in the bottom 5%?

A researcher records the following body mass index (BMI)scores for a group of participants: 28.4 1.6 (M SD).Participants who score between 25 and 30 on this scale are categorized as overweight.What percentage of participants fell in this category?

For a set of data with 25±2.5,at least 95% of scores fall between 20 and 30.

Two normal distributions are observed.The first distribution has a mean of 12 and a standard deviation of 2.The second distribution has a mean of 0 and a standard deviation of 2.For which distribution will the z score for the mean be larger?

In a normal distribution,the probability of a score above -1.0 SD is equal to the probability of a score below +1.0 SD.

State whether the first area is bigger,the second area is bigger,or the two areas are equal: the area to the left of z = 1.00,or the area to the left of z = -1.00.

A researcher records the following assessment data: 42 6 (M SD).The researcher only wants to sample participants scoring in the top 20% of this assessment.What is the cutoff score for the top 20% in this example?

The unit of measurement distributed along the x-axis of a standard normal distribution is referred to as a

Introduction to Statistics

Summarizing Data: Frequency Distributions in Tables and Graphs

Summarizing Data: Central Tendency

Summarizing Data: Variability

Probability

Probability and Sampling Distributions

Hypothesis Testing: Significance, Effect Size, and Power

Testing Means: One-Sample and Two-Independent Sample T Tests

Testing Means: Related Samples T Test

Estimation and Confidence Intervals

Analysis of Variance: One-Way Between-Subjects Design

Analysis of Variance: One-Way Within-Subjects Repeated Measures Design

Analysis of Variance: Two-Way Between-Subjects Factorial Design

Correlation

Linear Regression and Multiple Regression

Nonparametric Tests: Chi-Square Tests

Nonparametric Tests: Tests for Ordinal Data

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