Introduction to Sampling Distributions and the t-Distribution Study Guide The distribution of a random sample from a population is called the sample distribution. Using sample values, we can obtain estimates of the population parameters, such ...
Introduction The Law of Large Numbers and the Central Limit Theorem If a random sample of size n is taken from a population having a normal distribution with a mean μ and a standard deviation σ, then the sampling distribution of the sample mean
Introduction to Sample Surveys The results of surveys are presented almost daily in newspapers, over the radio, and on television. From surveys, the proportion p of the population with a certain trait or opinion can be estimated. In fact, if the sample size is ...
Introduction to Confidence Intervals for Proportions Studies are conducted and samples are drawn to learn more about one or more populations. If the form and parameters of the population distribution are known, there would be no need to sample. Sampling gives ...
Introduction to Hypothesis Testing for Proportions A confidence interval on the population proportion provides a set of plausible values for that proportion as we saw in the last lesson. If the proportion is hypothesized to be, say, 0.4, but the interval does ...
Introduction to Confidence Intervals and Tests of Hypotheses for Means The basic ideas of confidence intervals and hypothesis testing were used to develop large sample confidence intervals and hypothesis tests for population proportions. Here, we will learn ...
Introduction to The Matched-Pairs Design for Comparing Two Treatment Means Study Guide Thus far, we have only attempted to set confidence intervals on proportions or means based on a sample from a single treatment or population. Now we want to conduct studies ...
Find practice problems and solutions for these concepts at Confidence Intervals for Comparing Two Treatment or Population Means Practice Problems. Matched-pairs and two-group ...
Introduction to Analyzing Categorical Data In recent lessons, the responses have been numerical. When working with two treatments or populations, the treatments or populations may be thought of as categorical explanatory variables. In this lesson, we will ...
Statistics Practice Quiz The test has 50 multiple-choice questions covering the topics you studied in this statistics book. Although the format of the test is similar to that of the introductory test, the questions are different. Take as much time as ...