We want to conduct a hypothesis test of the claim that the population mean score on a nationwide examination in biology is different from 507. So, we choose a random sample of exam scores. The sample has a mean of 505 and a standard deviation of 70. For each of the following sampling scenarios, choose an appropriate test statistic for our hypothesis test on the population mean. Then calculate that statistic. Round your answers to two decimal places. (a) The sample has size 10, and it is from a normally distributed population with an unknown standard deviation. O== It is unclear which test statistic to use. (b) The sample has size 11, and it is from a normally distributed population with a known standard deviation of 77. :-0 0-10 O It is unclear which test statistic to use. 01-0 Continue Type here to search 2 3 대 % 5 AV 4 X 145 PM 11/22/20 Save For Later Submit Assigna 02020 McGraw-Hill Education All Rights Reserved. Tem of Use Privacy | Acce 9 7 CO 6 O