Math 120 Exam Study Guide with Complete Solutions

Math 120 Exam Study Guide with Complete Solutions Statistics - Answer-Is the science of collecting, organizing, summarizing, and analyzing information to draw conclusions or answer questions Population - Answer-The entire group to be studied is called Ex: Taking a survey of the whole elementary school of their favorite ice cream Sample - Answer-Is a subset of the population that is being studied Ex: Out of the whole elementary school 50 students were chosen to participate in a survey Descriptive Statistics - Answer-Consist of organizing and summarizing data. Describes data through numerical summaries, tables, and graphs Parameter - Answer-Is a numerical summary of a population Ex: Suppose 48.2% of all students on your campus own a car. This is numerical summary of the population EMILLECT 2024/2025 ACADEMIC YEAR ©2024 EMILLECT. ALL RIGHTS RESERVED. FIRST PUBLISH OCTOBER 2024. Page 2/8 Inferential Statistic - Answer-Use methods that take a result from a sample, extend it to the population, and measure the reliability of the result Ex: Rather than saying that 78% fo all students would return the money. We might say that between 74% and 82% fo all students would return the money Statistic - Answer-Is a numerical summary of a sample Ex: Suppose a sample of 100 students is obtained , and from this sample we find that 46% own a car Explanatory variable - Answer-is one that explains changes in that variable. Response variable - Answer-is the focus of a question in a study or experiment. Qualitative variable - Answer-allow for classification of individuals based on some attribute or characteristics Quantitative variable - Answer-provide numerical measures of individuals Discrete variable - Answer-is a quantitative variable that has either a finite number of possible values or countable number of possible values. Cannot take on every possible value between any two possible values EMILLECT 2024/2025 ACADEMIC YEAR ©2024 EMILLECT. ALL RIGHTS RESERVED. FIRST PUBLISH OCTOBER 2024. Page 3/8 Continuous variable - Answer-is a quantitative variable that has an infinite number of possible values that are not countable. May take on every possible value between any tow values Nominal level of measurement - Answer-if the values of the variable name, label, or categorize. Ordinal level of measurment - Answer-if it has the properties of the nominal level of measurement, however the name scheme allows for the values of the variable to arranged in ranked or specific order. Interval level of measurement - Answer-if it has the properties of ordinal level of measurement and the differences in the vales of the variable have meaning. A value of zero does not mean the absence of the quantity. Ratio level of measurement - Answer-if it has the properties of the interval level of measurement and the ratios of the values of the variable ha