A healthcare economist set out to determine if people between the ages of 50 and 60 years old spent more on pharmaceuticals this year compared to the national average. After gathering all of the necessary data, she conducted a hypothesis test with a significance level of 10 % . Determine the critical value or values for a one-mean z -test at the 10 % significance level if the hypothesis test is right-tailed ( H a : μ > μ 0 ).
