Data Collection & Sampling Techniques PDF

QUARTER 3 DATA COLLECTION & SAMPLING TECHNIQUES LEARNING TARGETS: I can… investigate different data collection and sampling techniques. organize statistical data in a frequency distribution table. use appropriate graphs to represent organized data: pie graph, bar graph, line graph, and...

QUARTER 3 DATA COLLECTION & SAMPLING TECHNIQUES LEARNING TARGETS: I can… investigate different data collection and sampling techniques. organize statistical data in a frequency distribution table. use appropriate graphs to represent organized data: pie graph, bar graph, line graph, and stem-and-leaf plot. interpret statistical graphs. WARM-UP ACTIVITY: Knowing Me, Knowing You WARM-UP ACTIVITY: Knowing Me, Knowing You Ask 10 learners from the class to supply the needed information in the table below. Student Gender Favorite Food Age Name Example: Male Spaghetti 11 yrs. old Juan What is STATISTICS? What is STATISTICS? It is a branch of mathematics that deals with collecting, organizing, analyzing, and interpreting data to address a certain phenomenon. What is DATA? The term “data” is defined as information, facts, or numbers collected for analysis Statistics is all about data. You collect data using several ways: surveys, observations, and experiments. Then you record the data you gathered along the way. Once you have the data, you will organize the data in such a way that it is presented systematically. You put it in order, or in a table or put it in a graph. Then, you have to analyze what this data tell you. You do computation using the data to help you know what the data are all about. Finally, you draw interpretation from the analysis. You made inferences based from the data which help you to predict future outcomes. BRANCHES OF STATISTICS BRANCHES OF STATISTICS Descriptive statistics deals with the methods of organizing, summarizing, and presenting data in order to yield meaningful information. EXAMPLE: 1. According to a recent survey, most Filipinos are still undecided on their choice for the next president. 2. About 45% of the students who are in favor of the new university policy are freshmen. BRANCHES OF STATISTICS Inferential statistics deals with the methods concerned with the analysis of data, which allows making inferences or predictions about body of data. EXAMPLE: 1. A politician would like to estimate, based on an opinion poll, his chances of winning. 2. A college dean predicts the national passing percentage for this year’s board licensure examination based on the results of the examination during the last six years.  Population refers to a group of individuals or entities that the researcher is interested to gather information or draw conclusions from. Public school teachers in Luzon A parameter is a numerical measurement describing a characteristics of a population. A sample is part of a population or is a subcollection of elements drawn from a population. VARIABLE VARIABLE LEVELS OF MEASUREMENTS LEVELS OF MEASUREMENTS LEVELS OF MEASUREMENTS LEVELS OF MEASUREMENTS LEVELS OF MEASUREMENTS 1.-4*7 2.-4*9 3.7*6 4.-6*-7 5.-7*-7 6.-7*5 7.6*-5 8.8*-9 9.-7*-4 10. 8*-6