Question: Should I use a one-tailed or a two-tailed z-test
Scenario: Lucy wants to know her fourth grade daughter, Monica, scored on a test of reading comprehension compared to the population of other fourth graders in the school district. Luckily Lucy has taken this course and knows that z-scores will help her understand Monica’s reading score in relation to the population.
data as follows:
-Monica’s reading comprehension score = 121
-Mean Fourth grade reading comprehension score = 147
- Standard Deviation of the fourth grade’s reading comprehension = 14.8