# Sampling ExercisesChapters 1-4n menfinger1. The Division of Traffic and Parking at a large university wants to know the percentage ofstudents who used the campus bus system last week. They take a random sample of fourhundred students from their list of students with parking stickers and find that 20% of them haveused the bus system during the past week. The results of this survey are reported as follows:"With 95% confidence, the percentage of students using the bus system lies in the range 20% ±4%."a.Identify each of the following:parameterpopulationsamplesample statisticlevel of confidencemargin of errorsampling frameand theb. This survey is likely to be biased because:i) the sampling frame is not the same as the population.ii) the margin of error is too large.ii) of nonresponse biasPick one and briefly explain (including a statement of whether the problem is a type ofsampling error or a type of non-sampling error).2. A rand

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Step 1

In this question we have given the data on situation of university , where some students use university bus service. On the basis of given information we ahve to answer some questions based on that sample.

Step 2

Parameter: Parameters refers to the value that defines the whole population. In this question, Parameter is the percentage of population who use campus bus system last week.

Population: In this question population is all the students who are studying in the college.

Sample: Sample is a subset of population, with the help of which we calculate the statistics and make inferences about the population. In this question 400 students from the list of students with parking stickers is sample.

Statistic: It is a numerical value that defines the characteristics of the sample and by the help of statistic we make inferences. In this question “p = 0.20” is statistic because it defines that 20% of sample uses campus bus service last week.

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