Week 5 Knowledge Check Homework Practice Questions
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Part 1 of 4 - Z-interval for Unknown Questions 7.0/ 7.0 Points
Question 1 of 20
The FDA regulates that fresh Albacore tuna fish that is con
...
Week 5 Knowledge Check Homework Practice Questions
Return to Assessment List
Part 1 of 4 - Z-interval for Unknown Questions 7.0/ 7.0 Points
Question 1 of 20
The FDA regulates that fresh Albacore tuna fish that is consumed is allowed to contain 0.82 ppm of
mercury or less. A laboratory is estimating the amount of mercury in tuna fish for a new company and needs to have
a margin of error within 0.03 ppm of mercury with 95% confidence. Assume the population standard deviation is
0.138 ppm of mercury. What sample size is needed? Round up to the nearest integer. Answer: 82
Answer Key: 82
Feedback:
Z-Critical Value = NORM.S.INV(.975) = 1.96
n =
n =
Question 2 of 20
Select the correct answer for the blank: If everything else stays the same, the required sample size
____ as the confidence level increases to reach the same margin of error. Answer:
A. Increases
B. Decreases
C. Remains the same
MATH302 B007 Win 20 Tests & Quizzes
Tests & Quizzes
2/10/2020 APUS CLE : MATH302 B007 Win 20 : Tests & Quizzes
https://edge.apus.edu/portal/site/422035/tool/34abd8b5-c97c-7121-4d4a-439bef8595aa/jsf/select/selectIndex 2/12
1.0/ 1.0 Points
1.0/ 1.0 Points
1.0/ 1.0 Points
Answer Key: A
Question 3 of 20
Suppose a marketing company wants to determine the current proportion of customers who click on
ads on their smartphones. It was estimated that the current proportion of customers who click on ads on their
smartphones is 0.68. How many customers should the company survey in order to be 97% confident that the
margin of error is 0.29 for the confidence interval of true proportion of customers who click on ads on their
smartphones? Answer: (Round up your answer to nearest whole number) 13
Answer Key: 13
Feedback:
Z-Critical Value = NORM.S.INV(.985) = 2.17009
n =
n =
Question 4 of 20
A researcher would like to estimate the proportion of all children that have been diagnosed with
Autism Spectrum Disorder (ASD) in their county. They are using 95% confidence level and the CDC national
estimate that 1 in 68 ≈ 0.0147 children are diagnosed with ASD. What sample size should the researcher use to get
a margin of error to be within 2%? Round up to the nearest integer. Answer 140
Answer Key: 140
Feedback:
Z-Critical Value = NORM.S.INV(.975) = 1.96
n =
Question 5 of 20
The population standard deviation for the height of college baseball players is 3.2 inches. If we want
to estimate 90% confidence interval for the population mean height of these players with a 0.7 margin of error, how
many randomly selected players must be surveyed? (Round up your answer to nearest whole number) Answer:
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