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Ch. 2 means to an end

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• 1. Ch. 2 – Means to an End
BEH383 – Week 1
• 2. Key Terms
Measures of central tendency (averages):
Mean
Median
Mode
• 3. Mean
Most common type of average
Calculated by adding all of the values up and then dividing the total by the number of values
M is typically the symbol for mean, n is typically the symbol for sample size
• 4. Mean
To calculate the mean, you add 2150 to 1534 to 3564 and divide the sum by 3 (n = 3)
The mean is 2416
• 5. Weighted Mean
When you have multiple occurrences of the same value in a data set
Calculated as (value x frequency)/total frequency
• 6. Weighted Mean
To calculate the weighted mean, divide (total value x frequency) by (total frequency)
The weighted mean is 89.67
• 7. Median
The median is simple the middle value when all values are arranged from highest to lowest
In the data set, half (50%) of the values should fall above the median and half should fall below
When there are an even number of values, the median is the mean of the two middlemost values
• 8. Median
For odd-numbered data sets, select the middle value
For even number data sets take the mean of the two middle values
The median for the first data set is \$42537.
The median for the second data set is \$42447.
• 9. Mean VS. Median
Q: Why use the median as a measure of central tendency?
A: Median is not sensitive to extreme scores (outliers)
• 10. Mean VS. Median
The mean for this data set is \$50056.
The median is \$42537.
• 11. Mode
Mode is, very simply, the most frequently occur piece of data in the set
In this data set, the mode is Brown hair