Exam 10: Independent Groups T-Test

Dr.Johnson is studying the effects of aspirin on heart rate.He believes that aspirin will lower heart rate.He has 2 groups the treatment group receives 80mg of aspirin for a week (n=4)the control group received a placebo (n=4)and their heart rates are compared.Below is his data in which heart rate is beats per minute.He sets his alpha level at 0.05 and uses a directional test. What is Dr.Johnson's critical t-value?

(Multiple Choice)

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Question 121

What is an estimated pooled variance?

(Multiple Choice)

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Question 122

The independent groups t test requires that n₁ equal n₂.

(True/False)

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Question 123

Dr.Hansen believes a person taking Tylenol PM will sleep longer but will be drowsier during the day.One group of subjects took.Tylenol (n=5)for 1 month and reported the number of times he or she felt sleepy.The second group was given a placebo (n=5)and asked to log the number of times they felt sleepy with in a month.Sleepy was defined as the urge to sleep or to engage in micro-sleeps at some point in the day. a.Is there a significant difference between the 2 groups? (Directional and alpha level was set at .05) b.What is the nature of the relationship? c.What is the strength of the relationship based on eta²? d.Explain why you used an Independent t-test?

(Essay)

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Question 124

A physical therapist is interested in whether people with different bone structures will be affected differently by her new therapy program.She randomly chooses two groups of patients based on bone type: small-boned frame (X_S)and large-boned frame (X_L).Patients all had similar injuries.She measures the number of days each person takes to progress to a predetermined point.Here is the data: Based on the computed t value,what can you conclude?

(Multiple Choice)

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Question 125

Eta-squared indexes the _ of the relationship between the independent and dependent variables since it represents the _ of variability in the dependent variable that is associated with the independent variable.

(Multiple Choice)

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Question 126

Like the standard error of the mean,the standard error of the difference is positively skewed.

(True/False)

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Question 127

Which of the following is a numerical index that most reflects the influence of disturbance variables?

(Multiple Choice)

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Question 128

Increasing ______ reduces the standard error of the difference.

(Short Answer)

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Question 129

1.00 minus eta-squared represents the proportion of variability in the dependent variable that is not associated with the independent variable--that is,the proportion of sample variability that is due to disturbance variables.

(True/False)

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Question 130

Which of the following conditions would make it inappropriate to use an independent-groups t test?

(Multiple Choice)

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Question 131

A physical therapist is interested in whether people with different bone structures will be affected differently by her new therapy program.She randomly chooses two groups of patients based on bone type: small-boned frame (X_S)and large-boned frame (X_L).Patients all had similar injuries.She measures the number of days each person takes to progress to a predetermined point.Here is the data: What is the observed value of the independent groups t test?

(Multiple Choice)

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Question 132

Which of the following assumptions applies to the independent groups t test?

(Multiple Choice)

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Question 133

The independent groups t test is typically used to analyze the relationship between two variables when the dependent variable is quantitative in nature and is measured on a level that at least approximates interval characteristics,and when the independent variable is between-subjects and has two levels.

(True/False)

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Question 134

Typically,research in the behavioral sciences involves _____ values of eta-squared.

(Multiple Choice)

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Question 135

The standard error of the difference becomes smaller as the sample sizes _ and the variability of the scores in the populations _.

(Multiple Choice)

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Question 136

Eta-squared can range from -1.0 to +1.0.

(True/False)

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Question 137

The standard deviation of the sampling distribution of the difference between two independent means is called the:

(Multiple Choice)

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Question 138

The estimated standard error of the difference is only influenced by the sample size.

(True/False)

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Question 139

What factors influence the size of the standard error of the difference?

(Essay)

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Question 140

Showing 121 - 140 of 149

What is an estimated pooled variance?

The independent groups t test requires that n₁ equal n₂.

Eta-squared indexes the _ of the relationship between the independent and dependent variables since it represents the _ of variability in the dependent variable that is associated with the independent variable.

Like the standard error of the mean,the standard error of the difference is positively skewed.

Which of the following is a numerical index that most reflects the influence of disturbance variables?

Increasing ______ reduces the standard error of the difference.

1.00 minus eta-squared represents the proportion of variability in the dependent variable that is not associated with the independent variable--that is,the proportion of sample variability that is due to disturbance variables.

Which of the following conditions would make it inappropriate to use an independent-groups t test?

Which of the following assumptions applies to the independent groups t test?

Typically,research in the behavioral sciences involves _____ values of eta-squared.

The standard error of the difference becomes smaller as the sample sizes _ and the variability of the scores in the populations _.

Eta-squared can range from -1.0 to +1.0.

The standard deviation of the sampling distribution of the difference between two independent means is called the:

The estimated standard error of the difference is only influenced by the sample size.

What factors influence the size of the standard error of the difference?

Introduction and Mathematical Preliminaries

Frequency and Probability Distributions

Measures of Central Tendency and Variability

Percentiles,percentile Ranks,standard Scores,and the Normal Distribution

Pearson Correlation and Regression: Descriptive Aspects

Probability

Estimation and Sampling Distributions

Hypothesis Testing: Inferences About a Single Mean

Principles of Research Design and Statistical Preliminaries for Analyzing Bivariate Relationships

Correlated Groups T-Test

One-Way Repeated Measures Analysis of Variance

Pearson Correlation and Regression: Inferential Aspects

Chi-Square Test

Nonparametric Statistics

Two-Way Between-Subjects Analysis of Variance

Overview and Extension: Statistical Tests for More Complex Designs

Filters

Exam 10: Independent Groups T-Test

What is an estimated pooled variance?

The independent groups t test requires that n1 equal n2.

Eta-squared indexes the _____ of the relationship between the independent and dependent variables since it represents the _____ of variability in the dependent variable that is associated with the independent variable.

Like the standard error of the mean,the standard error of the difference is positively skewed.

Which of the following is a numerical index that most reflects the influence of disturbance variables?

Increasing ______ reduces the standard error of the difference.

1.00 minus eta-squared represents the proportion of variability in the dependent variable that is not associated with the independent variable--that is,the proportion of sample variability that is due to disturbance variables.

Which of the following conditions would make it inappropriate to use an independent-groups t test?

Which of the following assumptions applies to the independent groups t test?

Typically,research in the behavioral sciences involves _____ values of eta-squared.

The standard error of the difference becomes smaller as the sample sizes _____ and the variability of the scores in the populations _____.

Eta-squared can range from -1.0 to +1.0.

The standard deviation of the sampling distribution of the difference between two independent means is called the:

The estimated standard error of the difference is only influenced by the sample size.

What factors influence the size of the standard error of the difference?

Introduction and Mathematical Preliminaries

Frequency and Probability Distributions

Measures of Central Tendency and Variability

Percentiles,percentile Ranks,standard Scores,and the Normal Distribution

Pearson Correlation and Regression: Descriptive Aspects

Probability

Estimation and Sampling Distributions

Hypothesis Testing: Inferences About a Single Mean

Principles of Research Design and Statistical Preliminaries for Analyzing Bivariate Relationships

Correlated Groups T-Test

One-Way Repeated Measures Analysis of Variance

Pearson Correlation and Regression: Inferential Aspects

Chi-Square Test

Nonparametric Statistics

Two-Way Between-Subjects Analysis of Variance

Overview and Extension: Statistical Tests for More Complex Designs

Filters

The independent groups t test requires that n₁ equal n₂.

Eta-squared indexes the _ of the relationship between the independent and dependent variables since it represents the _ of variability in the dependent variable that is associated with the independent variable.

The standard error of the difference becomes smaller as the sample sizes _ and the variability of the scores in the populations _.