Airbnb hosts wish to learn the average length of stay of all visitors that are under the age of 30. A statistician determines that to calculate a 95% confidence level estimate of the average length of stay to within /- 1.5 days, a total of 95 young visitors' check-in/check-out records will have to be examined. How many records should be looked at to obtain a 95% confidence level estimate to within /- 0.5 days