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Statistical Sampling

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Wize University Statistics Textbook > Collecting Data & Sampling

Statistical Sampling

9 Activities

For a telephone survey, we decide to randomly sample the list of all area codes in the US, and select 12 of them. Next, we randomly sample 100 phone numbers from each of the 12 area codes we selected. What is this an example of, and which bias problem might we run into?
More Statistical Sampling Questions:
Statistical Sampling
Which of the following is a disadvantage of stratified sampling over cluster sampling?
Statistical sampling
A principal wants to test the blood type of her students in grade 9 to 12. What kind of sample is described by the following?
Statistical sampling
A principal wants to test the blood type of her students in grade 9 to 12. What kind of sample is described by the following?
Statistical Sampling
Answer the following questions about sampling and bias
Statistical Sampling
Which of the following is true about cluster and stratified random sampling techniques?
Statistical sampling
A principal wants to test the blood type of her students in grade 9 to 12. What kind of sample is described by the following?
Statistical sampling
A teacher takes a random sample of 15 students in his class and asks the question “How many text messages do you receive a day?”. The sample average is 45.6 text messages. He then concludes “students at this University on average receive 45.6 text messages a day”. This is an example of
Statistical Sampling
Which of the following is a disadvantage of stratified sampling over cluster sampling?
Statistical Sampling
There are 600 Sephora locations in the United States. Christine randomly selected 40 stores, and then she randomly selected 100 customers from each of those stores. Less than 1% of her sample identified as heterosexual males. Based on her sample, the average spending at Sephora is $45. In addition, 340 customers in her sample revealed that they have VIB Rouge status, which the highest tier status that is reached when a customer spends $1,000 in a calendar year.
What was Christine’s sampling method?
Statistical sampling
(ii) What sampling method was used by the urban planner?
Statistical Sampling: Sampling and Issues
Answer the following questions:
Statistical Sampling
I had an entrepreneurship class in college where I had to go interview local businesses to learn about the issues they faced on a day-to-day basis. I decided to make a list of all businesses by searching on Google Maps, and randomly selecting 10 businesses from that list using excel's random number generator. This is an example of:
Statistical Sampling
I had an entrepreneurship class in college where I had to go interview local businesses to learn about the issues they faced on a day-to-day basis. I decided to go downtown and ask all the businesses located on the main street. This is an example of:
Statistical sampling
Which of the following methods will not result in any selection bias:
Statistical Sampling
Which of the following is a disadvantage of stratified sampling over cluster sampling?
Statistical Sampling
Parts (a) to (d) are based on the following information:
A study on wellbeing and stress of university students is conducted. The researcher drew a random sample of 5 departments on campus. Then he randomly sampled 100 students within each department that was selected and handed them the link to his online survey. Ultimately, only 30% of the sample responded. Amongst those who responded, 120 of them say they feel stressed.
(a) What sampling method was used?
Statistical Sampling
Michelle randomly selected a sample of 300 undergraduate students at UBC from 1st year, 2nd year, 3rd year, and 4th year of study. It is revealed that 58% of them watched Black Panther.
True or false? Enter T for True; F for False. (Use capital letters: T, F)
1. 58% of all UBC students watched Black Panther.
F
Statistical Sampling: Sample VS Population
We want to determine the average salary of assistant professors at AU. Based on a random sample of 100 from the HRMS database of all assistant professors, the mean salary is $100,000.
Answer choices:
(a) All professors at AU
Statistical Properties: Practice
True or false? Enter "T" for true; "F" for false (without quotations).
Statistical Sampling
(iii) What was Christine’s sampling method?
Statistical sampling
(ii) What sampling method was used by the urban planner?
Statistical Sampling
Twin Pines is a town with a population of 200,000 residents, divided in 35 neighbourhoods. You randomly draw 8 neighbourhoods and then perform SRS from each of those selected neighbourhoods in order to compile your sample. Which sampling method was performed?
Statistical Sampling
Based on an online poll, CTV predicted that Blake Drew will win the election by a landslide. However, he lost to Drake Blew, who was leading in the landline telephone polls. Why were the polls showing different results? Select all that apply.
Statistical sampling
Which of the following statements about simple random sampling (SRS) is true?
Statistical Sampling
Which of the following types of sampling method is most likely to have biased results?
Statistical Sampling
Suppose that the mean height of 10 year old males is 138.4 cm with a standard deviation of 9.6 cm. From 30 randomly selected 10 year old males, what is the probability the sample mean is greater than 140 cm?