Question

Professor Smith loves dark chocolate, and she would like to find out the proportion of the population that shares her preference. She randomly sampled 500 people, and 470 people chose dark chocolate. To construct a 95% confidence interval, she should use:

• 2-SampZInt
• ZInterval
• 2-PropZInt
• 1-PropZInt
• 2-SampTInt
• TInterval

Answer 1

To construct a 95% confidence interval she should use 1-Prop Z Int
Because only one set of sample is taken and since sample size is large so z test should be used.