Chapter 9.3, Problem 25BB

Choose the correct option and proof the reason why you choose that one and give the evidences.         A company called The Bear Necessities Business conducted a survey to gather customer feedback about a recent change they made.   From the data collected, a 95% confidence interval was constructed to estimate the difference between the proportion of new customers who are positive about the change and the proportion of old customers who are positive about the change. The limits of this confidence interval are (-0.31, 0.49).   Use this information to answer the following questions.   The point estimate used for the confidence interval is a sample mean/sample porportion/different of two sample means/different of two sample proportion. The sample proportion for new customers was the same as/higher than/ lower than he sample proportion for old customers.   Some but not all/All he sample proportion for old customers.   Therefore, we can not/can claim that the proportion of customers who are…

In linear regression, when are we likely use the prediction interval and confidence interval? Mention some scenarios that we might need it.

creat a confidence interval suitable