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. State the null and alternative hypotheses to test whether the data agree with the percentages stated in the national survey.

Question

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. State the null and alternative hypotheses to test whether the data agree with the percentages stated in the national survey.

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The Answer of 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. State the null and alternative hypotheses to test whether the data agree with the percentages stated in the national survey.