A study tests whether short naps improve performance on a sustained-attention task. 24 24 participants were randomly assigned to two groups. All participants performed a 70 70 -trial vigilance task. After trial 20 20 , one group was allowed a 15 15 -minute nap while the other group remained awake. The response variable recorded was the number of correct detections out of the final 50 50 trials for each subject. What is the response variable? Is it qualitative or quantitative? If quantitative, is it discrete or continuous?

The response variable is the number of correct detections out of the final 50 50 trials; it is quantitative and discrete

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1. Intro to Stats and Collecting Data(0)

Intro to Stats
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Levels of Measurement
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Intro to Collecting Data
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Sampling Methods
(0)

2. Describing Data with Tables and Graphs(0)

Visualizing Qualitative vs. Quantitative Data
(0)

Frequency Distributions
(0)

Histograms
(0)

Bar Graphs and Pareto Charts
(0)

Pie Charts
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Frequency Polygons
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Dot Plots
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Stemplots (Stem-and-Leaf Plots)
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Time-Series Graph
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3. Describing Data Numerically(0)

Mean
(0)

Median
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Mode
(0)

Standard Deviation
(0)

Interpreting Standard Deviation
(0)

Percentiles & Quartiles
(0)

Boxplots
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4. Probability(0)

Basic Concepts of Probability
(0)

Complements
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Addition Rule
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Multiplication Rule: Independent Events
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Introduction to Contingency Tables
(0)

Multiplication Rule: Dependent Events
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Bayes' Theorem
(0)

Fundamental Counting Principle
(0)

Counting
(0)

5. Binomial Distribution & Discrete Random Variables(0)

Discrete Random Variables
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Binomial Distribution
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Poisson Distribution
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Hypergeometric Distribution
(0)

6. Normal Distribution and Continuous Random Variables(0)

Uniform Distribution
(0)

Standard Normal Distribution
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Non-Standard Normal Distribution
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7. Sampling Distributions & Confidence Intervals: Mean(0)

Sampling Distribution of the Sample Mean and Central Limit Theorem
(0)

Introduction to Confidence Intervals
(0)

Confidence Intervals for Population Mean
(0)

Determining the Minimum Sample Size Required
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8. Sampling Distributions & Confidence Intervals: Proportion(0)

Sampling Distribution of Sample Proportion
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Confidence Intervals for Population Proportion
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Chi Square Distribution
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Confidence Intervals for Population Variance
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9. Hypothesis Testing for One Sample(0)

Steps in Hypothesis Testing
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Performing Hypothesis Tests: Means
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Performing Hypothesis Tests: Proportions
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Performing Hypothesis Tests: Variance
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Critical Values and Rejection Regions
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Link Between Confidence Intervals and Hypothesis Testing
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Type I & Type II Errors
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10. Hypothesis Testing for Two Samples(0)

Two Proportions
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Two Means - Unknown, Unequal Variance
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Two Means - Unknown, Equal Variance
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Two Means - Known Variance
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Two Means - Matched Pairs (Dependent Samples)
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Two Variances and F Distribution
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11. Correlation(0)

Scatterplots & Intro to Correlation
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Correlation Coefficient
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12. Regression(0)

Linear Regression & Least Squares Method
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Residuals
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Coefficient of Determination
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Inferences for Slope
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Prediction Intervals
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Quadratic Regression
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13. Chi-Square Tests & Goodness of Fit(0)

Goodness of Fit Test
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Contingency Tables
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Independence Tests
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Homogeneity Tests
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14. ANOVA(0)

Introduction to ANOVA
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Multiple Comparisons: Tukey Test
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Multiple Comparisons: Tukey-Kramer Test
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Multiple Comparisons: Bonferoni Test
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Two-Way ANOVA
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2. Describing Data with Tables and Graphs

Visualizing Qualitative vs. Quantitative Data

2. Describing Data with Tables and Graphs

Visualizing Qualitative vs. Quantitative Data: Videos & Practice Problems

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Problem 38Multiple Choice

A study tests whether short naps improve performance on a sustained-attention task. $24$ participants were randomly assigned to two groups. All participants performed a $70$ -trial vigilance task. After trial $20$ , one group was allowed a $15$ -minute nap while the other group remained awake. The response variable recorded was the number of correct detections out of the final $50$ trials for each subject. What is the response variable? Is it qualitative or quantitative? If quantitative, is it discrete or continuous?

The response variable is the mean accuracy across all trials; it is qualitative and ordinal

The response variable is whether the participant napped; it is qualitative and nominal

The response variable is the reaction time on each trial; it is quantitative and continuous

The response variable is the number of correct detections out of the final $50$ trials; it is quantitative and discrete

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