For Question 1 and 5, assume you were told of an additional uncounted 5000 completed surveys, which showed a similar average and standard deviation as the data you currently had. Now you have to base your calculations assuming there are 5000 surveys (data points) instead of the original 15775 surveys. Would this impact your z-score? And therefore your p-value? In which way (would the z-score be higher and p-value lower? Vice-versa