A. A gas company claims that two thirds of the houses in certain large city are heated by natural gas. A random sample of 1000 houses in this city found 625 are heated by natural gas. Test the gas company's claim at the 5% significance level.
- hypotheses
- check conditions
- decision rule
- computation
- conclusion
B. Is this hypothesis test a right-tailed , left-tailed, or two-tailed test? Explain why you chose that kind of test in this situation.
C. Explain carefully what the P-value represents in context.