SOCSCI 2J03 Lecture Notes - Lecture 10: Standard Deviation, Frequency Distribution, Blood Pressure

• School: McMaster University
• Department: Social Sciences
• Course: SOCSCI 2J03
• Professor: Rizwan Tahir

Document Summary

Socsci 2j03 lecture 10 use of standard deviation. Short-cut formulas for the variance and standard deviation for grouped data: the standard deviation is obtained by taking the positive square root of the variance, population standard deviation: s = Give the frequency distribution of the daily commuting times (in minutes) from home to work for all 25 employees of a company: calculate the variance and standard deviation. (mann, 2016) 62. 11 minutes: therefore, the standard deviation of the daily commuting times for these employees is 11. 62 minutes, (units of standard deviation same as actual units of data) For any number k greater than 1, at least (1 1/k ) of the data values lie within k standard deviations of the mean. (mann, 2016) Both values at equal distance from average value: the value of k is obtained by dividing the distance between the mean and each point by the.