Stats PPT 2 Flashcards
What is the difference between incidence and prevalence?
Incidence = new cases Prevalence = existing cases
What is morbidity?
The incidence or prevalence of a disease or of all diseases in a population.
What is mortality?
Death rate
What is the difference between morbidity and mortality?
Morbidity = what makes trouble/ causes bad effects. Mortality = what kills
What are two basic kinds of statistical variable?
Qualitative= ex: male/ female Quantitative= ex: number/ measurement
How is the mean calculated?
It is the mathematical middle value. Total #values divided by the number of measurements.
Ex: Test scores/number of students tested = mean
How is the mean different from the median?
With median, 1/2 of all values fall above and 1/2 of all values fall below.
When talking about values, what is the mode?
The value that turns up most often.
What does standard deviation tell you?
How tightly the data cluster around the mean.
The degree of variability of the data.
1 SD = 68% 2 SD = 95% 3 SD = 99%
What kind of data distribution needs to be present in order for these terms to be useful?
Normal distribution
What are the percentages of the data set represented by SD of 1, 2, or 3?
1 SD = 68% 2 SD = 95% 3 SD = 99%
How do you calculate percent change from one value to another?
New-old/old x 100
What does the P value tell you?
P = Probability of null hypothesis being true. Your confidence in significance.
What probability does the P value describe?
The correlation is random, not meaningful.
Randomness versus statistical significance.
P=0.05: Statistically significant. P=0.01: Greater Statistical Significance. P=0.001: Very high statistical significance.
What does the margin of error tell you?
How far up and down from your stated value you actually lie within your range of measurements.
The range of deviation from the reported value like an election poll. Also known as the Confidence Interval.
