A research study was conducted to investigate the proportion of learning disabilities (LD) in an elementary school in Texas. Out of a total of 2,706 participants were interviewed and a total of 368 responses were diagnosed with specific learning disabilities (SLD). Assume that the proportion of students with SLD in the particular population was 7.5%. 1) Write the null and alternative hypotheses for a formal test of significance 2) Calculate Z-statistic to test the null hypothesis (no need to show your calculations, just provide the estimates of Z-statistic in 4~5 decimal places) 3) Interpret your results at the alpha level of .05.