Fukcing Bio Fuck Stats Flashcards
Standard deviation
The mean distance each observation is away from the mean
Catagorical variable
Eg colour
Binary categorical variabel
2 categories
Continuos variable
Can take on any variable
Investigated in the mean or average value
Sampling method used for continuous variables
Histogram
How to figure out the spread if continuous
- using the mean (central tendency ) and standard deviation (spread/variability) to figure out the spread
The two different sorts of error
- Errors that make our answers more uncertain i.e variability
- Errors that move us away from the truth ie bias
How can bias be avoided
- taking a random sample from the whole population
More variability IN POPULATION ______ population standard deviation
INCREASES
What sample size follows the shape of a normal distribution and what shape is it
Large - 30 or more
Symmetric bell shape curve - requires mean and standard deviation to draw its shape
____ of the sample means will lie within ____ standard errors of the ______
95% of the sample means will lie within 1.96 standard errors of the population mean
Equation for scatter plots + regression lines
Y = a+b X x
95% confident that the true mean or proportion is in the interval
Yep
Population mean symbol
Funky M
Population standard deviation symbol
O with a nose
