A researcher wants to determine if reading scores will be different for local 3rd graders who are part of an intervention, compared to the mean reading scores for the population of all 3rd graders. Twenty participants are randomly sampled and have a mean reading score of 86. The population reading score is 73 with a standard error of 10. Test the null hypothesis with z-test, at the .05 level of significance. QUESTION:Calculate the observed z-score for SCENARIO 2. Show all of your work