Economics: Productivity A random sample of leading companies in South Korea gave the following percentage yields based on assets (see reference in 7): 2.5 2.0 4.5 1.8 0.5 3.6 2.4 0.2 1.7 1.8 1.4 5.4 1.1 Use a calculator to verify that s 2 2.247 for these South Korean companies. Another random sample of leading companies in Sweden gave the following percentage yields based on assets: 2.3 3.2 3.6 1.2 3.6 2.8 2.3 3.5 2.8 Use a calculator to verify that s 2 0.624 for these Swedish companies. Test the claim that the population variance of percentage yields on assets for South Korean companies is higher than that for companies in Sweden. Use a 5% level of significance. How could your test conclusion relate to an economists question regarding volatility of corporate productivity of large companies in South Korea compared with those in Sweden?
Chapter 2 Exploring Data with Graphs and Numerical Summaries 2.1 Different Types of Data Categorical Variables: These are variables that you can put into different groups, generally non-numerical answers. Things like favorite colors, political party afﬁliation, or letter grades are categorical variables. Quantitative Variables: These are variables that are represented by numerical values. An amount of something. There are two types are quantitative variables: Discrete: these are characterized as having a FINITE amount of possible outcomes. Continuous: these, on the other hand, have an inﬁnite list of possible outcomes and can generally be measured. Note: For quantitative data: there are two key features. Example: The class list below has all the information for ea