The US Department of Energy reported that more than 50% of homes were heated by natural gas. A random sample of 348 homes in Oregon found that 192 were heated by natural gas. Test the claim using a 5% significance level. a. What type of test will be used in this problem? Select an answer b. What evidence justifies the use of this test? Check all that apply The sample size is larger than 30 The population standard deviation is known The sample standard deviation is not known There are two different samples being compared The original population is approximately normal The population standard deviation is not known Onp > 5 and nq > 5