An airline company is interested in improving customer satisfaction rate from the 58

%

currently claimed. The company sponsored a survey of 123

customers and found that 78

customers were satisfied. Determine whether sufficient evidence exists that the customer satisfaction rate is higher than the claim by the company.

What is the test statistic z

?

What is the p

-value?

Does sufficient evidence exist that the customer satisfaction rate is higher than the claim by the company at a significance level of

=

0.01

?