We record data on the weight of guinea pigs. What kind of data is this?

If the standard deviation of the population is higher, what will do to the standard error?

What will a lower sample size do to the standard error?

We have data on years of education. The mean is 12 years of education. The standard deviation is 3. This tells us that 68% of the population have education in the range:

The Office of National Statistics collects data on the number of ears that people have on their heads. Do you expect that the standard deviation of this data will be high or low?

The mean that we get from our sample is called the sample mean. It is usually close to the population mean but its actual value is random.

What number do we use to measure the expected accuracy of the sample mean?

What is a sampling frame?

Do you think data from systematic or random sampling is more likely to be representative of a study population?

We can describe quantitative data with two kinds of averages, the median and the mean. They are the same in “Normal” data. If the data is positively skewed (like an income distribution), which average is more affected by extreme values?

We can understand quantitative data by putting data into “bins”. The counting the number of data points in each “bin” gives us a frequency table. If we plot the frequency table, what is the resulting graph called?