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 = 200 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 the large-sample rejection region appropriate for this test if we are using α = 0.05. A) Reject $\mathrm { H } _ { 0 }$ if $\mathrm { z } < - 1.645$ or $\mathrm { z } > 1.645$ .
B) Reject $\mathrm { H } _ { 0 }$ if $\mathrm { z } < - 1.96$ or $\mathrm { z } > 1.96$ .
C) Reject $\mathrm { H } _ { 0 }$ if $\mathrm { z } > 1.645$ .
D) Reject $\mathrm { H } _ { 0 }$ if $\mathrm { z } < - 1.96$ .