3. In an survey research of public companies listed in NYSE, 250 companies were randomly selected companies, and information regarding their debt-to-assets ratio were collected. The mean debt-to-total-asset ratio for the sample is 0.5625. Hintl: debt + equity = total assets Hint2: Assume the population standard deviation (o) is known to be 0.5. Hint3: use z-test 3.1 (6 points). Do these data indicate that NYSE-listed companies use more debt than equity? (significant at the 1% level) 3.2 \\- . .Construct a 95% confidence interval for the population mean debt-to-total- assets ratio. 3.3 - . All else being equal, suppose the sample size increases from 250 to 1200, would the p-value from these new data for testing the hypotheses in part (1) be smaller or larger than that the p-value from the data in part (1)? Briefly justify your