Statistical Sciences 2244A/B Study Guide - Final Guide: Data Center, Supreme Headquarters Allied Powers Europe, Percentile
22 May 2018
School
Department
Professor
Stats 2244
Summarizing Data
MEASURES OF CENTER
- Understand how to calculate…
o Mean
o Median (for even and odd number of data points)
o Mode
The study
- Is there a difference bw male and female heart rates?
- Heart rate (in beats per min, bpm) was measured for a group of 15 females and 16 males
The Data
- Is there a difference bw male and female heart rates? Looking at the values, there is some
variability so we must ask…
- Is there a typical heart rate for each biological sex?
Measures of center: Mean
- The central or typical value of a dataset
- (sum of all values) / (total # of values)
- mean HR for females = 93.7
- mean HR for males = 94.6
Measures of center: Median
- The midpoint value, separating the lower half and upper half of a dataset
- Put the data points in order from lowest to highest
- Median of females = 88 bpm
- Median of males = 80 bpm
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Measures of center: Mode
- The most common value in a dataset
- Mode for females = 100 bpm
- Mode for males = 64 bpm
- The mode can appear anywhere in the dataset, not just in the center
- There can also be more than 1 mode – when theres more than 1 value that is the most common
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Summary
- Is there a difference between male and female heart rates?
- The mean female heart rate is just barely lower than the males
- The median and mode female HR is higher than males
- So we have to look at other characteristics to answer our research question
MEASURES/DESCRIPTORS OF SHAPE
- Describe the shape of a distribution in terms of…
o Modality
o Symmetry
o Skew
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Understand how to calculate : mean, median (for even and odd number of data points, mode. Heart rate (in beats per min, bpm) was measured for a group of 15 females and 16 males. The central (cid:523)or (cid:494)typical(cid:495)(cid:524) value of a dataset. Mean hr for males = 94. 6 (sum of all values) / (total # of values) The midpoint value, separating the lower half and upper half of a dataset. Put the data points in order from lowest to highest. The most common value in a dataset. The mode can appear anywhere in the dataset, not just in the center. There can also be more than 1 mode when theres more than 1 value that is the most common. The mean female heart rate is just barely lower than the males. The median and mode female hr is higher than males. So we have to look at other characteristics to answer our research question.
