Standard Deviation and Variance (Class 2) OBJ: Find range, measures of central tendency, and construct tables and graphs

Below are the algebra test scores for a class of 25 students:

Calculator commands: (at the bottom of the second page of notes) STAT, 1 (for EDIT), 50,ENTER (repeat for all data), STAT,  (for CALC), 1 (for 1-VAR STAT), ENTER (To clear data,▲L1, CLEAR, ENTER) 2ND STAT (for LIST),  (for MATH), 8, (for VARIANCE), 2ND 1 (for L1)

Give the mean, median, and mode Mean 78.4 Median 77 Mode 99

Give the standard deviation and variance Standard deviation 14.8 Variance 218.1

Below are the algebra test scores for a class of 25 students:

Below are the algebra test scores for a class of 25 students:

Give the mean, median, and mode. Give the standard deviation and variance Class 1 Class 2 Mean 78.4 Median 79 Mode 82 Standard deviation 9.8 Variance 95.2 Mean 78.4 Median 77 Mode 99 Standard deviation 14.8 Variance 218.1

Give range and class width Range Class Width /6 → 8

Construct a frequency table and a cumulative frequency table with 6 classes Class Relative Frequency

Construct a frequency table and a cumulative frequency table with 6 classes Class Relative Frequency Class Relative Frequency

Construct a frequency table and a cumulative frequency table with 6 classes Class Relative Frequency CumulativeFrequency Class < 56 # % 0

Construct a frequency table and a cumulative frequency table with 6 classes Class Relative Frequency Cumulative Class Frequency # % < % < % < % < % < % < % < %

Construct a histogram. Clearly mark axes. F r e q u e n c y Test Scores ClassRelative Frequency

Go to frequency polygon at the top of the next page of notes. Give all class marks

Construct a frequency polygon, mark axes F r e q u e n c y Test Scores Class Mark 51.5 Relative Frequency

Construct an ogive. Clearly mark both axes R C F e u r l m e a u q t l u i a e v t n e i c v y e Test Scores Cumulative Class Frequency # % < % < % < % < % < % < % < %