UNC Greensboro ECO 250 Homework 5 Quiz

Question 1
A ______ sample is a sample in which each member of the population has a known, nonzero, chance of being selected for the sample.

probability

systematic

simple random

convenience


Question 2
In _______ sampling, we divide the population into mutually exclusive groups and randomly sample from each of these groups.

stratified

cluster

probability

simple random


Question 3
Deanna has been hired to visit the local shopping mall to conduct a survey about the upcoming political election. She needs to select respondents at the mall and ask them questions about their voting tendencies. Deanna decides to walk around the mall and select shoppers to participate. Which of the following sampling techniques best describes Deanna's method?

convenience

systematic

simple random

stratified

Question 4
The average weight of the entire batch of the boxes of cereal filled today was 20.15 ounces. A random sample of four boxes was selected with the following weights: 20.05, 20.56, 20.72, and 20.43. The sampling error for this sample is _______.


Question 5
The presence of sampling error is an indication that an improper sampling technique was used.

True

False

Question 6
________ errors can occur as a result of a questionnaire that contains ambiguous questions.

Nonsampling

Sampling

Nonprobability

Judgment


Question 7
The Central Limit Theorem (CLT) states that the sample means __________________.

of large-sized samples will be normally distributed regardless of the shape of their population distributions

of any samples will be normally distributed regardless of the shape of their population distributions

of large-sized samples will be uniformly distributed regardless of the shape of their population distributions

of any samples will be uniformly distributed regardless of the shape of their population distributions


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Question 8
According to the National Retail Federation, men spent an average of $484 over a recent Black Friday weekend. Assume that the standard deviation for this population is $146. A random sample of 42 men shoppers over this weekend was selected. What is the probability that the average amount spent on Black Friday weekend from this sample was less than $500?
(round your answer to 2 decimal points)


Question 9
According to the National Retail Federation, women spent an average of $317 over a recent Black Friday weekend. Assume that the standard deviation for this population is $90. A random sample of 50 women shoppers over this weekend was selected. What is the probability that the average amount spent on Black Friday weekend from this sample was more than $300?
(round your answer to 2 decimal places)




Question 10
According to the Labor Department, the average duration of unemployment for adults ages 20 to 24 was 34.6 weeks during a recent month. Assume that the standard deviation for this population is 10.2 weeks. A random sample of 36 adults in this age group was selected. What is the probability that the average duration of unemployment was between 31 and 35 weeks?
(round your answer to 4 decimal places)



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Question 11
A report by Capital Economics claims the average monthly mortgage payment in Chicago is $1,002. Assume that the standard deviation for monthly mortgage payments in Chicago is $168. A random sample of 55 homeowners in Chicago was selected and found to have an average monthly mortgage payment of $1,030.
Identify the lower bound of the symmetrical interval that includes 95% of the sample means if the true population mean is $1,002.



Question 12
A report by Capital Economics claims the average monthly mortgage payment in Chicago is $1,002. Assume that the standard deviation for monthly mortgage payments in Chicago is $168. A random sample of 55 homeowners in Chicago was selected and found to have an average monthly mortgage payment of $1,030.
Identify the upper bound of the symmetrical interval that includes 95% of the sample means if the true population mean is $1,002.



Question 13
A report by Capital Economics claims the average monthly mortgage payment in Chicago is $1,002. Assume that the standard deviation for monthly mortgage payments in Chicago is $168. A random sample of 55 homeowners in Chicago was selected and found to have an average monthly mortgage payment of $1,030.
Do the results of this survey support the report by Capital Economics? (hint: use the interval you constructed in the previous question and compare with the sample average.)

Yes

No

No answer text provided.

No answer text provided.