I need a tutor to review my answers, and I need help in question number 5, please. Ty

1- When and why are samples more convenient than working with an entire population?

When

When studying large populations, that would make Simple Random Samplingtoo overwhelming. For example, being with a random number and then establishing aninterval. Probability-based sampling methods are considered better because they can prevent sampling bias. However, there are times when it is not possible to use one of these methods. For example, a researcher may not have access to the entire population.

When there is a list of units of analysis from which you will take a sample and to which you will generalize.

When studying small populations, rely on a random number generator to select the participants.

Why

Because usually, a sample of the population is used in research, as it iseasier and cost-effective to process a smaller subset of the peoplerather than the entire group. The measurable characteristic of the population, like the mean or standard deviation, is known as the parameter. In other words, a sample is a subset of the people that are being studied. It represents the largest population and is used to conclude that population. It is a research technique widely used in sciences to collect information without measuring the entire population.

2-Why does the U.S. Census continue to be based on surveying the entire population and not on random samples?

Because the censusasks questions of people in homesandgroup living situations, including how many people live or stay in each house,and thesex, age,andrace of each person.Thegoal istocount everyone once, only once,andintheright place. In other words, when they survey the entire population, it is known as a census. Furthermore, acensus is a crucial data collection method that involves the whole population; a sampling method is not used in a census. Since all members participate in the census, the data collected is accurate and detailed. A census gathers information from each entity in a population.

3- What is a panel study?

A Panel Study is a form of longitudinal research in which a panel of respondents or subjects is selected and then followed or interviewed over time. In a Panel Study, Panel members are often difficult to recruit because of an unwillingness to fill out questionnaires or submit to interviews several times. For example, if in a Panel Study, first-year university students are selected, the researcher would be able to learn what their routes are towards an undergraduate degree individually. It is a quantitative research technique that obtains periodic information from a population sample.

4-What is Snowball Sampling?

Snowball sampling method: People can find one or two participants and get "referrals" for more potentialparticipants. Also, each participant/interviewee refers more people. In other words, snowball sampling or chain-referral sampling is defined as a non-probability sampling technique in which the samples have traits that are rare to find. This is a sampling technique in which existing subjects recruit samples required for a research study.

5- Which of the following distributions curves is symmetrical: (Help - I do not know)

I believe it is Random distribution, but I'm not sure, I know it is a bell curve, but the professor changes its name.

Platykurtic Distribution

Random Distribution

Probably Distribution