13) A study is planned to be conducted to verify what proportion of customers upgrade their internet account. A preliminary sample was taken that showed the proportion of customers upgrading was 0.43. This proportion was used as a planning value. With this planning value, what sample size must now be taken for the 95% confidence interval to have the margin of error of 0.056? Use the fact that 95% of normally distributed observations are within 1.96 standard deviations. Give your answer with 2 decimals. Do NOT round the sampe size to a whole number. For example, if you obtain 456.76 for the sample size, enter this value, not 457.

14) To estmate the mean number of days a stock has positive daily increases within a year, business researchers initiated a study. From previous similar studies it is known that the standard deviation of the population is 15.72. With this planning value, what sample size must now be taken for the 95% confidence interval to have the margin of error of 1.97? Use the fact that 95% of normally distributed observations are within 1.96 standard deviations. Give your answer with 2 decimals. Do NOT round the sampe size to a whole number. For example, if you obtain 456.76 for the sample size, enter this value, not 457.

15) Find the finite population correction factor for the sample size of 99 and the population size of 233. Round your answer to two decimals.