Are these examples of simple random sample, cluster sample, stratified sample, convenient sample or systematic sample and why?
A small company was trying to determine the amount of the average order for parts. It had received over 1000 orders for parts. The office manager had the computer select 35 of those orders randomly. He determined that the mean amount of these 35 orders was $389.45. One of the orders was for $350 in miscellaneous cables. He informed his boss that he was 95% certain that the average order that they had received was between $337.97 and $441.03
A hospital is trying to improve its patient services. The hospital administrator randomly chooses one nurse from each floor of the hospital to serve on a fact committee. The nurses are asked (among other things) to keep track of how many patients they visit during each hour of the day on the nurses' daytime shifts. At the end of a month the administrator collects the information and concluded that the nurses see an average of 22 patients per hour. (Although the values ranged from 53 to 6 patients per hour. Based on this information the administrator reports that the average number of patients visited per hour by all nurses is 20.