Consider the following two scenarios involving hypothesis testing the population mean, and complete the sentences that follow.
i. the mean iq score of adults is known to be 100. in order to test whether the mean iq of lawyers is higher than 100, a random sample of 10 lawyers was chosen and their iq measured and recorded. it was found that for the 10 sampled lawyers the average iq score was 101.4 with a standard deviation of 14.5. it is known that iq scores follow a normal distribution. ii. the mean iq score of adults is known to be 100. in order to test whether the mean iq of lawyers is higher than 100, a random sample of 10 lawyers was chosen and their iq measured and recorded. it was found that for the 10 sampled lawyers the average iq score was 101.4. it is known that iq scores follow a normal distribution with standard deviation of 15.in scenario i, the -select- population standard deviation is known standard deviation is calculated from the sample -select-, and therefore the -select- t-test z-test -select- should be used. in scenario ii, the -select- population standard deviation is known standard deviation is calculated from the sample -select-, and therefore the -select- t-test z-test -select- should be used.