z Scores. In Exercises 58, express all z scores with two decimal places.Student's Pulse Rate A male student of the author has a measured pulse rate of 52 beats per minute. Based on Data Set 1 in Appendix B, maleshave a mean pulse rate of 67.3 beats per minute and a standard deviation of 10.3 beats per minute.a. What is the difference between the student's pulse rate and the mean pulse rate of males?b. How many standard deviations is that (the difference found in part (a))?c. Convert the student's pulse rate to a z score.d. If we consider usual pulse rates to be those that convert to z scores between 2 and 2, is the student's pulse rate usual or unusual?
Ch. 3 Statistical Descriptions of Data • Measures of Central Tendency & Dispersion: these show the center and variability and are calculated for numerical summaries • Measures of Central Tendency: describe the typical values of the data o Show the center of gravity/middle of the data • Mean (Average): add all the values and then divide by the number of values o Sample Mean: sum of the observations divided by the sample size (n) ̅ o A bar over a letter means the average, so X means the average of all values of X Σx o Equation: X= i n o The mean is not resistant to outliers; outliers will sway the mean •
