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7.93 Random Sampling? If you walked around your school campus and asked people you met how...
Let's say you want to poll a random sample of 150 students on campus to see...
Let's say you want to poll a random sample of 150 students on campus to see if they prefer to take online classes. Of course, if you took an actual poll you would only get one number (your sample proportion, p-hat). Imagine all the possible samples of 150 students that you could draw and the distribution of all the possible sample proportions you would get from them. If I told you that we know that 35% of all students actually...
You are a researcher working for an educational research firm. Your firm was asked to conduct...
You are a researcher working for an educational research firm. Your firm was asked to conduct a satisfaction survey among the parents of students attending the School District public schools. Your boss has asked you to develop a sampling design for this survey. For this survey, you are asked to select a representative sample of parents. When you answer the questions, keep the following in mind: Assume that you have unlimited authority to access all the information you may need...
Imagine that you are asked to determine students’ opinions at your school about different types of...
Imagine that you are asked to determine students’ opinions at your school about different types of contraception or birth control methods. Describe how you could go about getting a sample of each of the following types: simple random sample, sample of convenience, voluntary response sample, stratified sample, cluster sample, systematic sample.
Would you agree to the statement on random sampling methods. Please explain why. In probability samples...
Would you agree to the statement on random sampling methods. Please explain why. In probability samples “each population element has a known (non-zero) chance of being chosen for the sample.” (StatTrek 2020). Some examples of probability samples are, simple random sampling, stratified sampling, cluster sampling, multistage sampling, and systematic random sampling. Simple random sampling is the population and sample consists of “N” objects, and an example is when people play the lottery. Stratified sampling is based on some type of...
In 1996, the General Social Survey (which uses a method similar to simple random sampling) asked,...
In 1996, the General Social Survey (which uses a method similar to simple random sampling) asked, "On the whole, do you think it should be the government's responsibility to provide decent housing for those who can't afford it?" For this question, 240 people said that it definitely should out of 1572 randomly selected people. We will make a 90% confidence interval for: p, the true population proportion that would have answered yes to this question p-hat, the sample proportion that...
A random sample of university students were asked whether they participate in varsity athletics and how...
A random sample of university students were asked whether they participate in varsity athletics and how many times they had used marijuana in the last ten days. If the necessary conditions are met, which of the following methods would be most appropriate to test for an association between the whether or not a student participates in varsity athletics and the frequency of marijuana use? A) One sample t-test B) Paired t-test C) Two sample t-test for difference in means D)...
Suppose there is a McDonald's next to your school and you want to estimate the proportion,...
Suppose there is a McDonald's next to your school and you want to estimate the proportion, p of all people at your school who go to McDonald's on a typical school day. (a) If you had no preliminary estimate for p. how many people should you include in a random sample to be 85% sure that the estimate will be within a distance of 0.05 from p? Make sure to show the formula with the numbers plugged in. (b) Complete...
Suppose there is a McDonald's next to your school and you want to estimate the proportion,...
Suppose there is a McDonald's next to your school and you want to estimate the proportion, p of all people at your school who go to McDonald's on a typical school day. (a) If you had no preliminary estimate for p. how many people should you include in a random sample to be 85% sure that the estimate will be within a distance of 0.05 from p? Make sure to show the formula with the numbers plugged in. (b) Complete...
1.You plan to randomly select 10 students from your campus and ask them how many minutes...
1.You plan to randomly select 10 students from your campus and ask them how many minutes they exercised in the past seven days. The distribution of values taken by the average exercising time in all possible samples of size 10 is the (a) probability distribution of exercising times. (b) sampling distribution of average exercising times. (c) variance of the exercising time values. (d) population parameter. 2. The sampling distribution of a statistic is a. the probability that we obtain the...
In 2012, the General Social Survey asked a random sample of adults, "Compared to most people, how...
In 2012, the General Social Survey asked a random sample of adults, "Compared to most people, how informed are you about politics?" Suppose that the following are the data classified by their responses to this question and their age group (the data has been modified slightly for testing purposes) Not at Al A Little 30 29 26 59 Extremely Somewhat Very 13 24 25 78 28 Age 20-29 Age 30-39 Age 40-49 Age 50 or older 16 49 20 120...
A random sample of university students were asked whether they participate in varsity athletics and how many times they had used marijuana in the last ten days. If the necessary conditions are met, which of the following methods would be most appropriate to test for an association between the whether or not a student participates in varsity athletics and the frequency of marijuana use? A) One sample t-test B) Paired t-test C) Two sample t-test for difference in means D)...
In 2012, the General Social Survey asked a random sample of adults, "Compared to most people, how informed are you about politics?" Suppose that the following are the data classified by their responses to this question and their age group (the data has been modified slightly for testing purposes) Not at Al A Little 30 29 26 59 Extremely Somewhat Very 13 24 25 78 28 Age 20-29 Age 30-39 Age 40-49 Age 50 or older 16 49 20 120...
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