Kids with phones: A marketing manager for a phone company claims that the percentage of children aged 8-12 who have phones differs from 51%. In a survey of 830 children aged 8-12 by the National Consumers League, 415 of them had phones. Can you conclude that the manager's claim is true? Use the a = 0.05 level of significance.
a) Compute the test statistic. Do not round intermediate steps. Round the answer to at least two decimal places.
b) Compute the P-value. Use the answer from part a. Round the answer to at least four decimal places.
c) Determine whether to reject H0.
d) At the a = 0.05 level of significance, there (is or is not) enough evidence to conclude that the percentage of children aged 8-12 who have phones differs from 51%.