The article “How to Block Nuisance Calls” (The Guardian, November 7, 2015) reported that in a survey of mobile phone users, 70% of those surveyed said they had received at least one nuisance call to their mobile phone in the last month. Suppose that this estimate was based on a representative sample of 600 mobile phone users. These data can be used to determine if there is evidence that more than two-thirds all mobile phone users have received at least one nuisance call in the last month. The largesample test for a population proportion was used to test H₀: p = 0.667 versus Ha: p > 0.667. The resulting P-value was 0.043. Using a significance level of 0.05, the null hypothesis was rejected.

a. Based on the hypothesis test, what can you conclude about the proportion of mobile phone users who received at least one nuisance call on their mobile phones within the last month?

b. Is it reasonable to say that the data provide strong support for the alternative hypothesis?

c. Is it reasonable to say that the data provide strong support against the null hypothesis?