Question

4) 25 randomly selected people were surveyed and it was found that the average amount they charged was 1200 in a year with a standard deviation of 600. Given α = 0.025, test the claim that the mean amount charged by all people with credit cards is greater than 1300. Confirm your results using the p–value method as well as the critical t value.

5)

5) In a study 800 people out of 1000 people surveyed indicated that they supported a ban on plastic straws. At the 0.01 significance level, test the claim that more than 75% of the population of Canada supports a ban on plastic straws. Determine the Null and Alternate Hypotheses, determine if the test is a one or two–tailed test and in the case of a one–tailed test state if it is a right or left–tailed test. Use both the critical value and p–value methods to test the claim.

Answer 1