1) The document discusses the chi-square distribution and its properties including that it has one parameter called degrees of freedom, assumes only nonnegative values denoted by χ2, and its curve shape depends on the degrees of freedom. 2) It provides an example of finding the value of χ2 for 7 degrees of freedom and an area of 0.10 in the right tail. 3) It discusses contingency tables and tests of independence, defining them as testing whether two attributes in a population are related. The test statistic is calculated as the sum of the squared differences between observed and expected frequencies divided by the expected frequencies.