Problem #1 (A)

Bumble has three different smartphone calculator applications, A, B, and C, and wonders if they differ in usability. To test this, he gathered 900 participants and had each person try one of the three calculator apps, and then asked if the app is easy to use or not easy to use. Of the 300 participants that used Calculator A, 56% reported that the app is easy to use, which compares to 57% of the 300 that used Calculator B and 66% of the remaining 300 that used Calculator C.

To help Bumble conduct an appropriate test,

What is H0 and H1