How can the scientific method be applied in your daily life?

Looking for your house keys:

hypothesis 1.: "my keys are in my jacket pocket."

test 1. - look in jacket pocket, keys not there.

hypothesis 2.: "they are on top of my dresser."

test 2.- look on dresser, keys not there

hypothesis 3. - "I left them in the front door last night"

test 3. - look in door, keys are there.

The scientific method just means proposing an hypothesis, testing it, and (re)proposing a (new?) hypothesis based on the data, and testing that one ... and repeating.

So figuring out why your DVD won't play on your new TV, looking for your keys, and so on can all be accomplished through the scientific method.