Answer: Type I error would be a conclusion that average time spent on phone by teenager is higher than 4.5 hours per week which is actually the same.
Explanation:
Type 1 error occurs when a null hypothesis is true but researcher rejects it.
Let
be the average time spent on the phone by teenagers .
Here, Null hypothesis:

Alternative hypothesis :

So, Type I error would be a conclusion that average time spent on phone by teenager is higher than 4.5 hours per week which is actually the same.