# GGR270H1 Final: Week 7 Study Notes

## Document Summary

Ggr 270 lecture 7 october 27, 2010. The frequency of sample means will be normally distributed. when the sample size is large, the sample mean is likely to be quite close to the population mean. a large sample is more likely to be closer to the true population mean than a smaller sample. standard deviation of the sampling distribution is equal to the sample standard deviation divided by the square root of the sample size. If sampled population is normal, then sampling distribution of means will also be normal, no matter what the sample size. If the sampled population is approximately normal, then the sampling distribution of means will be approximately normal for relatively small sample sizes. when the population is skewed, the sample size must be large (n>30) before the sampling distribution will become normal. statistical inference is concerned about making decisions or predictions about population parameters using samples.