Just 2 and 3 2. You are going to survey a random sample of the 748 students in t

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Just 2 and 3

2. You are going to survey a random sample of the 748 students in the 25 sections of STA 2023 to evaluate the course. Name each sampling method described below. Your choices . simple random, stratified, systematic, clustered, and multistage. (1pt ea) a. Randomly select a seat position (eg, second row, first on left) and survey the student in that seat from every section. b. Randomly generate 30 names from the full course roster. C. Randomly select two sections and survey every third name in the alphabetized class roster. d. From the full course roster, randomly choose three students from each of the 25 sections. e. Pick every 30 name on the full course roster. 3. You consider other options for the STA 2023 student survey. Name the sampling mistakes of the following methods and briefly describe how they can be biased a. You pass out surveys to all the students in class on a specific day. b. You make the survey available online (so everyone has access) and ask students to complete it. C. You give every student a copy of a 6-page survey at the end of the final exam (as a separate document so there's no attribution). 4. The average exam grade for a STA 2023 exam is 80 points with a standard deviation of 10 points. a following the If section has 30 students, answer the assuming sample of 30 students is independent and the CLT applies. a. What is the mean of the sample distribution for the exam mean? E(D) b. Compute the standard deviation of the sample mean. SDOT) c. (4pts) In what range would you expect most ie., 99.7%) of all exam means to fall. D 1 2 of 5

Explanation / Answer

2) (a) Multistage sampling as it involves two stages like first select a seat position and then survey the student from that class.

(b) Simple random sampling as a sample size of 30 is generated and each student has an equal probability of being chosen.

(c) Clustered sampling students are divided into sections (clusters) and then random sample from each section

(d) Startified sampling as it involves divinding the students into starta and choosing simple random sample from that.

(e) Systemetic sampling it involves arranging the students according to some ordering scheme.

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