A recent article by a writer for trentonian. com stated that no more than 20% of Americans support increased oil exploration off the east coast of the US. To test that claim, a sample of 500 randomly selected adults is contacted by Centennial Polling. According to survey results, 120 of those contacted expressed support for increased exploration. Is this sufficient sample evidence to challenge the writer’s statement? Set up an appropriate hypothesis test here, using newspaper’s claim as the null hypothesis. Test at the 5% significance level.
a. Show the competing hypotheses.
b. Compute the pvalue for the sample result and report your conclusion.