Goodness of Fit Test: Videos & Practice Problems

A researcher claims that the distribution of people’s preferred grocery shopping methods has changed from a past survey. According to the past survey, the distribution was:
In-store shopping: $50\%$
Online pickup: $20\%$
Home delivery: $15\%$
Subscription service: $15\%$
To test this claim, a sample of $400$ people was surveyed with the following results:

Decide whether to reject or fail to reject the null hypothesis if $\alpha =0.05$.