Jrhighppt.ppt about frequency distribution
- 3. WHAT IS FREQUENCY? Frequency is the number of times an observation or a particular value appears in a data set. WHAT IS FREQUENCY DISTRIBUTION TABLE? It is a systematics way of presenting data using a table.
- 4. Two types of frequency distribution Ungrouped frequency distribution -classifies a given data set(usually n<30) under a specific category or class. Grouped frequency distribution - having an interval or ratio-level data and beyond a sample size of 30.
- 5. Ungrouped frequency Grouped frequency distribution distribution distribution AGE TALLY FREQUENCY 19 18 17 16 15 CLASS INTERVAL TALLY FREQUENCY 95-99 90-94 85-89 80-84 75-79
- 6. Ungrouped Frequency Distribution Twenty-five positive cases of COVID-19 were given a blood tests to determine their blood type. The data set is as follows: A B B AB O O O B AB B B B O A O A O O O AB AB A O B A
- 7. Definitions Range- a measure of spread in Statistics. It is the difference between the greatest value and the least value in a set of numerical data. Class Interval- number of classes Class size- obtained by dividing the range by the class interval Lower Limit- the smallest value in the class Upper Limit- the highest value in the class
- 8. Example of Grouped Frequency Distribution The following are test scores of section 1. Construct a suitable frequency table. Use 6 as the number of classes. 14 15 30 19 10 18 26 30 10 15 15 28 10 30 34 40 20 43 20 30 10 22 36 36
- 9. Steps in constructing a grouped frequency distribution table. Step 1. Find the range.=highest value – lower value Step 2. decide on the number of classes(usually 5-20). =2^k˃n where k = unknown number; n= total number of correspondent Step 3. Solve the class width or class size by dividing the range by the number of classes or intervals
- 10. Step 4. Add the class width to the starting point to get the second lower class limit. Then enter the upper class limit. Step 5. represent each score by a tally and count the total frequency of each class.
- 11. •Another example: •The following are test scores of section 1. Construct a suitable frequency table. Use 6 as the number of classes. • 14 15 30 19 10 18 • 26 30 10 15 15 28 • 10 30 34 40 20 43 • 20 30 10 22 36 36 1. Number of classes or interval-6 2. Range = H - L = 43 -10 =33 3. Class size = R/i =33/6 = 5.5 or 6
- 12. By group activity Grades of 40 students in math SCORES TALLY FREQUENCY 95-99 III 3 90-94 IIII 5 85-89 IIII-IIII 9 80-84 IIII-IIII-III 13 75-79 IIII 4 70-74 IIII-I 6
- 13. Answer the following: ( 5 pts. each) 1. How many class intervals are there? 2. What is the lowest class interval? Highest class interval? 3. What is the class size? 4. Which score interval has the highest frequency? Lowest frequency?
- 14. Direction: Make a frequency distribution table using the data below. Jessica is a “plantita”, she surveyed twenty households in their barangay and found out the number of varieties of plants they own. The results are: 3, 0, 1, 4, 4, 1, 2, 0, 2, 2, 0, 2, 0, 1, 3, 1, 2, 1, 1, 3
- 15. Assignment The following shows the intelligence quotient (IQ) of 20 students. Construct the frequency distribution using 6 intervals. 97 90 92 91 92 92 87 100 97 98 101 110 98 93 95 100 93 91 98 105
- 16. Thank you for listening