A Consumer Product Magazine Recently Ran a Story Concerning the Increasing

A consumer product magazine recently ran a story concerning the increasing prices of digital cameras. The story stated that digital camera prices dipped a couple of years ago, but now are beginning to increase in price because of added features. According to the story, the average price of all digital cameras a couple of years ago was $\$ 215.00$ . A random sample of $n = 22$ cameras was recently taken and entered into a spreadsheet. It was desired to test to determine if that average price of all digital cameras is now more than $\$ 215.00$ . Find a rejection region appropriate for this test if we are using $\alpha = 0.05$ .

A) Reject $\mathrm { H } _ { 0 }$ if $\mathrm { t } > 1.725$
B) Reject $\mathrm { H } _ { 0 }$ if $\mathrm { t } > 1.717$
C) Reject $\mathrm { H } _ { 0 }$ if $\mathrm { t } > 2.080$ or $\mathrm { t } < - 2.080$
D) Reject $\mathrm { H } _ { 0 }$ if $\mathrm { t } > 1.721$