Author Question: Define each of the following statistical terms: a . Descriptive statistics b. Statistical inference ... (Read 335 times)

Caiter2013 · **on:** Aug 1, 2018

Define each of the following statistical terms: a . Descriptive statistics b. Statistical inference c. Confidence level d. Significance level e. Population f. Sample

Question 2

In simple linear regression, the regression equation is a straight line. In multiple regression, what geometric form is taken by the regression equation when there are two independent variables? When there are three or more independent variables?

al · **Reply #1 on:** Aug 1, 2018

Answer to Question 1

a . Descriptive statistics is organizing, summarizing, and analyzing data to describe a sample.
b. Statistical inference is the process of making an estimate, prediction, or decision about a population based on sample data.
c. The confidence level is the proportion of times that an estimating procedure will be correct.
d. The significance level is the proportion of times that a conclusion about a population will be wrong.
e. A population is the group of all items of interest to a statistics practitioner.
f. A sample is a set of data drawn from the studied population.

Answer to Question 2

When there are two independent variables, the regression equation can be thought of in terms of a geometric plane. When there are three or more independent variables, the regression equation becomes a mathematical entity called a hyperplane. It is impossible to visually summarize a regression with three or more independent variables because it will be in four or more dimensions.