Ink Pen Colours Narrative
a National Survey Stated That 30 $\alpha$

Essay

Ink Pen Colours Narrative
A national survey stated that 30% of the population prefer to use a pen with black ink, 30% prefer blue ink, 25% prefer red ink, and 15% prefer some other colour. A statistics professor took a random sample of 80 students and asked them to state their ink colour preference. The following data was recorded:
-Refer to Ink Pen Colours Narrative. Set up the appropriate rejection region for $\alpha$ = 0.05.