A simple random sample of 25 recent graduates from a particular collage gives a sample mean starting salary of $24,000 with sample standard deviation $3,000.
a) Give the 95% confidence interval. We did an almost identical (with different numbers) question in class on 3/8.
b) Without doing any calculations, would the 99% confidence interval be narrower or widerthan the 95% confidence interval.
c) Suppose the sample size was 50 (instead of 25) and the sample mean and standard deviation were the same values. Without doing any calculations, would the 95% confidence interval with n = 50 be narrower or wider than the 95% confidence interval withn = 25?