In a random sample of 70 prospectuses in which sales forecasts were disclosed, the mean debt to equity ratio prior to the offering was 3.97 and the sample standard deviation was 6.14. For an independent random sample of 51 prospectuses in which sales earnings forecasts were not disclosed, the mean debt to equity ratio was 4.29. Test against a two sided alternative, the null hypothesis that the population mean to debt ratios are the same disclosers and non disclosers of earnings forecasts.
For full points and my understanding, please show all steps