(a) Construct a 95% confidence interval estimate of p, the mean procrastination scale for first-year students at this college. There are two methods that can be used when constructing a confidence interval for a population mean . When the population standard deviation or is known, the sample mean is from a simple random sample, and the sample size n is large (generally in 2 30), the confidence interval can be constructed using a critical value. However, if the population standard de d deviation is unknown, a confidence interval can still be constructed so long as the sample mean is from a simple random sample, the sample size n is large (generally n2 30) or the population distribution is normal. In this case, a is estimated using the sample standard deviations and the confidence interval will be constructed using a t critical value. from a simple random sample and the sample size Select-sufficiently large. It is given that the standard deviation for the 65 first-year students in the study was 6.33. This Data was collected from a representative sample of 65 students, so the sample mean -Select standard deviation is from the Select, so a critical value will be used. -Select- Submit Sugiyou cannot come back