Sample Types
This type is when one selects from the population in a way every sample of a size has equal chance of selection
What is simple random sample?
One can't be forced to answer
What is nonresponse bias?
u and (x bar)
What is population and sample mean?
This is the input that spits out mean, median and mode
What is 1-Var Stats?
These are the two things to test before doing normalcdf for proportions
What is np>=10 and n(1-p)>=10?
This type doesn't allow random selection
What is sample of convenience?
It suggest a particular response
What is leading question bias?
M
What is the median?
This determines the area under a normal curve
What is normalcdf?
If for 2 samples the confidence interval is (-5,3) it's this
What is inconclusive?
This type makes you select an item at a start point as well as every kth item after
What is systematic sampling?
Strong opinions are more likely to participate
What is voluntary response bias?
r
What is the correlation coefficient?
This is the inverse of normalcdf
What is InvNorm?
This is the null hypothesis for paired samples
What is Ud=0?
When the population is too large to spread for simple random sampling, use this
What is cluster sampling?
No-one wants to report bad data bout their product
What is self interest bias?
(sigma)^2
What is population variance?
This test is used for independent samples
What is 2-SampTTest?
There are currently 3 distributions: normal, chi squared and this
What is Student t's distribution?
This type is where you divide the population into groups where each group is similar
What is stratified sampling?
People are reluctant to admit behavior that reflects negative on them
What is social acceptability bias?
Za/2
What is the critical value?
This is the test where the null is the probabilities are the same
What is X^2GOF-Test?
The best way to test for non-normality is look for multiple modes, large skewness, and this
What is outliers?