Estimating with uncertainty Flashcards
How to measure standard error
This is the standard deviation of the estimate’s sampling distribution.
Standard error of the estimates distribution= Sampling st dev/ square root n
The standard error measures precision
What is a sampling distribution?
The sampling distribution is the probability distribution of all values for an estimate that we might obtain when we sample a population.
Repeated random sampling can be used to estimate the true mean of the population
The effect of sample size on standard error
The equation for working out the standard error means that the larger the sample size, the smaller the standard error (increased precision)
How to calculate a 95% confidence interval?
2 SE contain 95% of data so can be used to work out 95% CI
CI= Y + 2SE
These can be displayed using error bars
What is estimation
Estimation is the process of inferring a population parameter from sample data.
