A cellphone provider has the business objective of wanting to determine the proportion of subscribers who would upgrade to a new cellphone with improved features if it were made available at a substantially reduced cost. Data are collected from a random sample of 500 subscribers. The results indicate that 121 of the subscribers would upgrade to a new cellphone at a reduced cost. Reducing the price will be profitable if at least 20% of the subscribers would upgrade. Complete parts(a) and(b) below.

What is the teststatistic?

ZSTAT=

nothing

(Type an integer or a decimal. Round to two decimal places asneeded.)

What is thep-value?

Thep-value is

nothing

.

(Type an integer or a decimal. Round to three decimal places asneeded.)