2 1 Part 1 Frequency Distributions

2 1 Part 1 Frequency Distributions In a frequency distribution, the class width is the distance between the lower or upper limits of consecutive classes. range. the difference between the maximum and minimum data entries. use the given minimum and maximum data entries, and the number of classes, to find the class width, the lower class limits, and the upper class limits. This is a lecture covering section 2.1 of the elementary statistics textbook. here we learn how to construct a frequency table (aka frequency distribution) f.

2 1 Part 1 Frequency Distributions 6. 2. 7. 1. a frequency is the number of times a value of the data occurs. according to table table 2.1.1 2.1. 1, there are three students who work two hours, five students who work three hours, and so on. the sum of the values in the frequency column, 20, represents the total number of students included in the sample. The practice of statistics for the ap exam 5th edition • isbn: 9781464108730 (1 more) daniel s. yates, daren s. starnes, david moore, josh tabor. To calculate the relative frequencies, divide each frequency by the sample size. the sample size is the sum of the frequencies. example: relative frequency distribution. from this table, the gardener can make observations, such as that 19% of the bird feeder visits were from chickadees and 25% were from finches. Constructing a frequency distribution table: 6 steps. 1. select the number of classes (usually between 5 20) 2. calculate the class width. 3. choose the value for the first lower class limit by using either the min value or a convenient value below the min. 4. use the first lower class value and the class width to find the other lower class values.

2 1 Part 1 Frequency Distributions To calculate the relative frequencies, divide each frequency by the sample size. the sample size is the sum of the frequencies. example: relative frequency distribution. from this table, the gardener can make observations, such as that 19% of the bird feeder visits were from chickadees and 25% were from finches. Constructing a frequency distribution table: 6 steps. 1. select the number of classes (usually between 5 20) 2. calculate the class width. 3. choose the value for the first lower class limit by using either the min value or a convenient value below the min. 4. use the first lower class value and the class width to find the other lower class values. 10{14 2 12 0.1 12 15{19 4 17 0.2 16 20{24 3 22 0.15 19 25{29 1 27 0.05 20 2 frequency histogram a frequency histogram is a graphical way to summarize a frequency distribution. it is a bar graph with the following properties: 1.the horizontal scale is quantitative and measures the data values. 2.the vertical scale measures the frequencies of the. 2.1 part 1 frequency distributions. this section expands on frequency distributions by discussing additional features: midpoints, which are the averages of class limits; relative frequency, which shows what portion of the data falls in each class; and cumulative frequency, which is the running total of all previous classes' frequencies.

2 1 Part 1 Frequency Distributions 10{14 2 12 0.1 12 15{19 4 17 0.2 16 20{24 3 22 0.15 19 25{29 1 27 0.05 20 2 frequency histogram a frequency histogram is a graphical way to summarize a frequency distribution. it is a bar graph with the following properties: 1.the horizontal scale is quantitative and measures the data values. 2.the vertical scale measures the frequencies of the. 2.1 part 1 frequency distributions. this section expands on frequency distributions by discussing additional features: midpoints, which are the averages of class limits; relative frequency, which shows what portion of the data falls in each class; and cumulative frequency, which is the running total of all previous classes' frequencies.

2 1 Part 1 Frequency Distributions