Chapter 4: Q. 37 (page 240)
Your statistics class has
Your SRS contains the students labeled
a.
b.
c.
d.
e.
Short Answer
SRS contains students labeled with
Chapter 4: Q. 37 (page 240)
Your statistics class has
Your SRS contains the students labeled
a.
b.
c.
d.
e.
SRS contains students labeled with
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Get started for freeSampling stuffed envelopes A large retailer prepares its customersโ
monthly credit card bills using an automatic machine that folds the bills, stuffs them into
envelopes, and seals the envelopes for mailing. Are the envelopes completely sealed?
Inspectors choose
inspection. Identify the population and the sample.
I work out a lot Are people influenced by what others say? Michael conducted an experiment in front of a popular gym. As people entered, he asked them how many days they typically work out per week. As he asked the question, he showed the subjects one of two clipboards, determined at random. Clipboard A had the question and many responses written down, where the majority of responses were
a. Calculate the difference (Clipboard A โ Clipboard B) in the mean number of days for the two groups. One hundred trials of a simulation were performed to see what differences in means would occur due only to chance variation in the random assignment, assuming that the responses on the clipboard donโt matter. The results are shown in the dotplot.
b. There is one dot at
c. Use the results of the simulation to determine if the difference in means from part (a) is statistically significant. Explain your reasoning.
The administration at a high school with 1800 students wants to gather student opinions about parking for students on campus. It isnโt practical to contact all students.
a. Give an example of a way to choose a voluntary response sample of students. Explain how this method could lead to bias.
b. Give an example of a way to choose a convenience sample of students. Explain how this method could lead to bias.
c. Describe how to select an
d. Explain how the method you described in part (c) avoids the biases you described in parts (a) and (b).
Tonya wanted to estimate the average amount of time that students at her school spend on Facebook each day. She gets an alphabetical roster of students in the school from the registrarโs office and numbers the students from 1 to 1137. Then Tonya uses a random number generator to pick 30 distinct labels from 1 to 1137. She surveys those 30 students about their Facebook use. Tonyaโs sample is a simple random sample because
a. it was selected using a chance process.
b. it gave every individual the same chance to be selected.
c. it gave every possible sample of size 30 an equal chance to be selected.
d. it doesnโt involve strata or clusters.
e. it is guaranteed to be representative of the population.
Tweet, tweet! What proportion of students at your school use Twitter? To find out, you survey a simple random sample of students from the school roster.
a. Will your sample result be exactly the same as the true population proportion? Explain your answer.
b. Which would be more likely to produce a sample result closer to the true population value: an SRS of
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