1. The random sample of five observations in exercise 1-1 found ? = 11.2 and s2 = 9.2. State your assumptions and construct a 90% confidence interval for the population mean µ.
2. The random sample of six observations in exercise 1-3 found ? = 1.5 and s2 = 6.7. State your assumptions and construct a 95% confidence interval for the population mean µ.
3. A random sample of 100 voters found that 48 of them favored candidate A. Construct a 90% confidence interval for the population proportion p that favor A.