3. An analysis from The Boston Globe (July. 2010) shows a dramatic decline in st

Question

3.

An analysis from The Boston Globe (July. 2010) shows a dramatic decline in studying time among current private college students The Boston Globe sampled many students in private universities and found that these college students study 12 hours per week on average An earlier study done in 1961 by the University of California found that students in private colleges studied 24 hours per week. A dean at the Hofstra University wonders if this trend is the same for students at his University. Using Excel to generate 200 random numbers, the dean uses the current list of all 21,000 undergraduate students at Hofstra University to select of sample of 250 students Of the choices below, what is the best description of the population of The Boston Globe study? Circle only one answer a) Students at private universities between 1961 and 2010. b) Any college student in 2010 c) Students attending private universities during 2010 d) Hofstra University students e) Students currently enrolled in private colleges Which of the following types of sampling best describes the method used by the dean at the Hofstra University? Circle only one answer a) Stratified Random Sampling b) Simple Random Sampling c) Convenience Sampling d) Systematic Random Sampling e) Cluster Sampling Suppose the dean at the Hofstra University were to randomly select 10 classes, and then survey every student in those non-overlapping classes (which means no students could be surveyed more than once) about their study habits Which of the following types of sampling best describes this alternate method'' Circle only one answer a) Stratified Random Sampling b) Simple Random Sampling c) Convenience Sampling d) Systematic Random Sampling e) Cluster Sampling The list of all current undergraduate students at the Hofstra University, is an example of a__.

Explanation / Answer

1) Since boston group sampled many students in JULY 2010 from private universities, the study is about students attending private colleges during 2010

Hence option C

2)

Simple random samples - random selection of data from the entire population so that each possible sample is equally likely to occur.

Stratified random sampling - divides the population into smaller groups, or strata, based on shared characteristics.

cluster sampling - total population is divided into clusters and clusters are selected as a whole for study

systematic random sampling - samples are collected at a constant rate or following certain distribution

convinience sampling - The samples that are easy to reach and easy to document are collected

From all the above definitions, we can conclude that dean uses Simple random sampling in his study

option B)

3)

Here hetrogenity exists between groups and homogenity existswithin group where entire population is divided into sections and sample is taken from each and every section.

hence Strtified random sampling is the best option

option A)

4) The list of all current UG students in a university is TOTAL POPULATION

The above list of 250 is random sampling

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