Community College Tuition. Use the following information for Exercises 53–63. The College Board reported that the mean tuition and fees at community colleges nationwide for the 2013–2014 academic year was $3264. Data were gathered on the total tuition and fees for a random sample of 10 community colleges in 2015. The normal probability plot is shown here.
Question 9.251
55. For the sample of 10 community colleges, the sample mean tuition and fees was $3541 with a sample standard deviation of $438. Test whether the population mean tuition and fees have increased using level of significance .
9.4.55
Step 1
Step 2 Reject if .
Step 3
Step 4 is . Therefore we reject . There is evidence at level of significance that the population mean tuition and fees for community colleges has increased from the previous level of $3264.