Two proportion Z-test:

Null hypothesis: There is no difference between the accuracy of Yahoo Weather forecast and the Accuweather forecast.

Alternative hypothesis: Yahoo Weather forecast is less accurate than the Accuweather forecast.

Chi square test for association of two variables:

Null hypothesis: There is no association between weather forecast apps (Yahoo Weather and AccuWeather) and the weather forecast accuracy.

Alternative hypothesis: There is an association between weather forecast apps (Yahoo Weather and AccuWeather) and the weather forecast accuracy.