Street-Smart Stats cover
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Lesson 1 Introduction to Statistical Research Methods
Lesson 2 Visualizing Data
Lesson 3 Central Tendency
Lesson 4 Variability
Lesson 5 Standardizing
Lesson 6 Normal Distribution
Lesson 7 Sampling Distributions
Lesson 8 Estimation
Lesson 9 Hypothesis Testing
Lesson 10 t-Tests for Dependent Samples
Lesson 11 t-Tests for Independent Samples
Lesson 12 Intro to One-Way ANOVA
Lesson 13 One-Way ANOVA: Test significance of differences
Lesson 14 Correlation
Lesson 15 Linear Regression
Lesson 16 Chi-Squared Tests
Afterward
Index

Let’s say we apply some kind of intervention to a sample, and then find that the mean of this sample is 11(“I” for “intervention”). Could we use this to estimate the population parameters if everyone were to receive the same intervention?

We could guess that the new population mean, which we’ll call ui, would be somewhere around 11. From the limited information we have, the sample mean is our best estimate for the new population mean. We call this a point estimate since it’s a single value rather than a range of values.

Actually, a range of values is exactly what we want. In this lesson, we’ll calculate confidence intervals for where ui might be; in other words, we’ll be fairly confident that ui is between two particular values. We’ll determine what these values should be.

In Lesson 6 you learned that for a normal distribution, most values (about 95%) are within two standard deviations of the mean.

1

We can extend this concept to sampling distributions: approximately 95% of sample means will fall within 15 the population mean.

2

To continue learning, purchase Street-Smart Stats: A Friendly Introduction to Statistical Research Methods.
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