STA2023 Module 1- Exam Questions and Correct Answers Latest Update () Already Passed

STA2023 Module 1- Exam Questions and Correct Answers Latest Update () Already Passed Define statistics - Answers Statistics deals with the collection, analysis, interpretation, and presentation of data in order to make decisions. Define Inferential Statistics - Answers Formal methods that use sample data to help make decisions or predictions about a situation. Define descriptive statistics - Answers Methods for organizing and summarizing data by using tables, graphs, and summary measures Define population - Answers collection of persons, things, or objects whose characteristics are being studied Define Sample - Answers portion of population that is being studied Define element/member - Answers specific subject about which the information is collected Define parameter - Answers A numerical characteristic of the whole population that can be estimated by a statistic. If we consider all math classes to be the population, than the average number of points are in per student over all the math classes is an example. Define statistic - Answers A numerical measurement that represents a sample. If you randomly select 20 students from the math population than the average number of points earned per student over the sample is an example. Define Variable - Answers A characteristic under study. It assumes different values for different members of the population or sample. Define Numerical Variables - Answers take on values with equal units, such as weight in pounds in time in hours Define categorical variables - Answers place the person or thing into a category Observation or Measurement - Answers value of a variable for an element Data - Answers actual values of the variable, they may be numbers or words quantitative variable - Answers A variable that can be measured numerically discrete variable - Answers variable whose values are countable. In other words can assume only certain values with no intermediate values quantitative continuous variable - Answers variable that is the result of measuring qualitative/categorical variable - Answers A variable looking out, assume numerical value, but the result of categorizing, or describing attributes of a population Random sample - Answers A sample drawn in such a way that each member of the population initially has an equal chance of being selected census - Answers Survey that includes every member of the population representative sample - Answers A sample that represents the characteristics of population as closely as possible Sampling with replacement - Answers each time we select an element from the population, we put it back in the population before we select the next element sampling without replacement - Answers when the selected element is not placed back in the population after being selected randomized experiments - Answers does aspirin reduce the risk of heart attacks? is one brand of fertilizer more effective growing roses than another? is fatigue as dangerous to a driver as the influence of alcohol? Designed experiments - Answers when the researcher manipulates, one of the variables to determine how the manipulation influences other variables observational study - Answers when the researcher merely observes what is happening or what has happened in the past and tries to draw conclusions based on his observations experimental group - Answers The group, in an experimental study that receives a special treatment/instruction Control group - Answers The group in an experimental study that does not receive a special treatment/instruction Raw data - Answers Data recorded in the sequence in which they are collected before they are processed or ranked Frequency distribution of a qualitative variable - Answers Lists all categories in the number of elements that belong to each of the categories Frequency, distribution table or frequency table - Answers exhibits how the frequencies are distributed over various categories Relative frequency of a category - Answers obtained by dividing the frequency of