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Biostat. Lect 2

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alchemist04's version from 2016-09-21 16:31

Section

Question Answer
When extreme score are not present in a data or when you want an average scores of actual numbers, you use what MCT?Mean
When an extreme scores are present or when data has a lot of Outliers and the mean may not be helpful, which MCT do you use?Median
What else can we learn from MCT (1)?MCT only describe a part of the sample or population
What else can we learn from MCT (2)?Information only describes the "middle" of the sample or population
What else can we learn from MCT (3)?you only see a segment of the group
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Question Answer
T or F? Variability from the mean can occur in either directionTrue
T or F? Distribution can only be affected by very small values or very high values called outliersTrue
T or F? Under normal conditions the mean represents the average values of the sampleTrue
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Question Answer
T or F? If a sample truly represents the population, you will expect to have a lot of variationTrue
The difference between the largest data value minus the smallest data value is called?Range
A measure of variability between scores around the mean, is called?Standard deviation
Highest Score - Lowest Score =Range
Variation can be ESTIMATED by calculating Ratio and Standard Deviation, T or F?True
Variation, and particularly Standard Deviation, Calculation can only be estimated from Discrete, Ratio, Continuous and Interval data, T or F?True
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Question Answer
The median is the 50% percentile of all the scores in a set, T or F?T
Median is middle-point of cases, mean is middle point of values, T or F?T
Median cannot be used when extreme scores very small or large, T or F?False
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Question Answer
A percentile designation of a continuum of 1 - 100% scores is ...percentiles ( P1, P2......)
Percent designations of a continuum of 25%, 50%, 75% scores is ....Quartiles (Q1, Q2, Q3.....)
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Question Answer
What is the formula for calculating "Range"?(Maximum value - Minimum value)/2
What is the formula for calculating "SD"?memorize the formula.
To calculate the "Variation", calculate the SD and square SD, T or F?True (need to practice this)
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Question Answer
Why do you use Variability? (1)(1) we use these values to determine the spread of the data
Why do you use variability? (2)(2) measures of central tendency will only tell us where the data centers
Why do you use Variability? (3)(3) Measure of variability like SD or VAR will tell us about how spread out the data is.
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