The R.R. Bowker company collects information on the retail prices of books and publishes the data in the Bowker annua libray and book and trade almanac. In 2005, the mean retail of agriculture books was $57.61. A hypothesis test is to be performed to decide whether this year's mean retail price of agriculture books has changed from the 2005 mean.
(a) Determine the null hypothesis
(b) Determine the alternative hypothesis
(c) Classify hypothesis test as left tailed,right tailed, or two tailed.