(a) A city manager wants to poll residents about a park renovation. Which of the following best describes a stratified sample of residents?The first 50 residents who walk into city hall one day are easily accessible. So, the city manager selects these residents.thThe city manager takes a list of the residents and selects every 5" resident until 50 residents are selected.The city manager forms 2 groups of residents based on the residents' incomes. Then, she selects 25 residents at random from each group.(b) A host on a cruise ship wants to collect data on the time passengers spend at various activities on board. Which of the following best describes aconvenience sample of passengers?The host selects the first 54 passengers who board because these passengers are easily accessible.The host assigns each passenger a different number. Using a random number table, he draws 54 of those numbers at random. Then, he selects thepassengers assigned to the drawn numbers. Every set of 54 passengers is equally likely to be drawn using the random number table.The host forms groups of 9 passengers based on the passengers' ages. Then, he randomly chooses 6 groups and selects all of the passengers in thesegroups.(c) A facilities supervisor at a sports stadium wants to rate the condition of the seats at the stadium. which of the following best describes a cluster sample ofseats?The supervisor forms 5 groups of seats based on the dates the seats were last replaced. Then, she selects 18 seats at random from each group.The supervisor takes a list of the seats and selects every 5 seat until 90 seats are selected.thThe supervisor forms groups of 30 seats based on the sections the seats are in. Then, she selects all of the seats in 3 randomly chosen groups.

Note: Hi there! Thank you for posting the question. As there are several independent questions, according to our policy we have solved the first question. If you need help with other questions, please re post separately.In simple random sampling procedure, each of the population unit has same chance of being included in the sample. Convenience sampling: A convenient and easily accessible sample is selected from the population. Voluntary response sampling: The respondents willingly or voluntary participate in the study and voluntary selected themselves as sample. Stratified random sampling: First the population is divided into sub-groups, which are homogenous. Now, randomly a particular numbers of sample units are selected from each sub-group. Multi-stage sampling: The hierarchical or relational structure of a large population is considered to collect samples through several stages, and it is considered the selection of smaller sampling units at each of the subsequent stages. Systematic sampling: Consider the population size is N and the sample size is n. Initially a ratio k = N/n is needed to find; Now, a random number must be chosen between 1 and k. Them, every kth population unit can be included in the sample. Cluster sampling: First the population is divided into naturally occurring groups called clusters. Here, each of the cluster is a representative of population. Now, a desired number of those groups, and every unit of the selected group is selected randomly and considered as sample. In first case, the city manager selectees the first 50 residents who walk into city hall one day. That is, the manager selects those residents who are easily accessible to him/her. Hence, it is a case of convenience sampling. In second case, the city manger selected every 5th resident from a list of the residents, till 50 residents are selected. Hence, it is a case of systematic sampling. In third case, the city manger selects two different groups based on the resident’s income. Hence the groups are homogeneous. Now, the manger selected a certain number of sample units, such as, 25 residents form each of the group. Hence, it is the case of stratified sampling. Thus, the third option best describes a stratified sample of residents.