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### GATHERING DATA- GRADE 7-Q4-week 2.pptx

• 1. GATHERING STATISTICAL DATA AND ORGANIZING DATA IN A FREQUENCY DISTRIBUTION TABLE
• 2. Aldrin has a part-time job at the Body Fit Gym. His boss wants to know the ages of the teenagers in the center’s taekwondo class. Aldrin records the ages of everyone in the class. Below are the ages of the teenagers. A.How many teenagers are attending the taekwondo class? B.What is the age of the oldest member of the taekwondo class? C.What is the age of the youngest member of the taekwondo class? D.How many teenagers belong to ages 13 to 15? E.How many students have an age greater than 15?
• 3. COLLECTION OF DATA • is an important part of Statistics. • Data should be collected in a manner that they are accurate and convenient to use.
• 4. DATA • is a collection of facts or information. They may be gathered by using the following methods. 1. Conducting Surveys Example: Teacher made a form and ask the students to fill out the previous grades and return the form to him/her.
• 5. 2. Observing the Outcomes of Events Example: Jessa wanted to find whether a die was fair or biased. She tossed the die 40 times and recorded the results.
• 6. 3. Taking measurements in experiments Example: The physicist and chemist conducted an experiment on how can saw dust be substituted for sand in the production of hollow blocks
• 7. 4. Reading Statistical Publication Example: Mr. Rivera check the date of birth of each student in the class registry.
• 8. METHODS USED IN THE COLLECTING DATA • Interview Method – this method of collecting data is an oral or verbal communication where the interviewer asks questions in any mode (face to face, telephone, or virtual) to an interviewee. The person gathering the data is called the interviewer, while the person supplying the data is the interviewee
• 9. METHODS USED IN THE COLLECTING DATA • Questionnaire Method – on this method data is gathered through a set of question that is mailed or handed to respondents who are expected to read and understand them. And the respondents then, write down their responses in the space provided the accomplished questionnaire is then returned for appropriate processing.
• 10. METHODS USED IN THE COLLECTING DATA • Observation Method – the data on this method are gathered either individually or collectively by means of observation. The person who gathers the data is called an investigator while the person being observed is called the subject.
• 11. METHODS USED IN THE COLLECTING DATA •Experiment Method – this method is used when the objective is to determine the cause and effect relationship of a certain phenomenon under controlled condition.
• 13. STEPS IN CONSTRUCTING A FREQUENCY TABLE (FOR UNGROUPED DATA) • Step 1: Make three columns. Arrange the data in order in the first column. • Step 2: Make a tally. • Step 3: Count the tallies then write the frequencies • Step 4: Total all the frequencies
• 14. Example 1: Below are the results of a survey about the favorite colors of 15 students in a freshman class. What color is the most favorite of the students and the least favorite color? Solution: 1. Write the colors in the first column. 2. Make a tally. 3. Count the tallies then write the frequencies. 4. Total all the frequencies.
• 15. It shows that red is the most favorite color and violet is the least favorite color of the 15 students.
• 16. Example 2: An airline asked their passenger on a flight to rate the quality of their service. The table below shows the ratings of 24 passengers. Make a frequency distribution table of the data collected. How many passengers gave a rating of 3 and below?
• 17. STEPS IN CONSTRUCTING A FREQUENCY TABLE FOR A GIVEN UNGROUPED DATA TO BE TRANSFORMED AS A GROUPED DATA. 1. Determine the range. Range is the difference between the highest value H and the lowest value L in the set of data. R = H – L 2. Determine the desired number of the class interval or categories. The ideal number of class interval in somewhere between 5 and 15. 3. Determine the class width or approximate size of the class interval by dividing the range by the desired number of class intervals.
• 18. STEPS IN CONSTRUCTING A FREQUENCY TABLE FOR A GIVEN UNGROUPED DATA TO BE TRANSFORMED AS A GROUPED DATA. 4. Write the class intervals starting with the lowest lower value as determined in the data. Then add the class width to the starting point to get the next interval. Do this until the highest value is contained in the last interval. 5. Tally the corresponding number of scores in each interval. Then summarize the results or sum up the tallies under the frequency column.
• 19. Example 1: The following are the test scores of students. Construct a suitable frequency table. Use 6 as the desired number of class interval.
• 20. Example 2: The following are the weights (in lbs) of grade 7 students. Construct a frequency table using 7 as the desired number of class interval. How many students weigh more than 100 lbs?
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