
Estimating Mean When Sigma Is Known
Authored by Anthony Clark
Mathematics
University

AI Actions
Add similar questions
Adjust reading levels
Convert to real-world scenario
Translate activity
More...
Content View
Student View
20 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Allen's hummingbird has been studied by zoologist Bill Alther. A small group of 15 Allen's hummingbirds has been under study in Arizona. The average weight for these birds is 3.15 grams. Based on previous studies, we can assume that the weights of Allen's hummingbirds have a normal distribution with a standard deviation of 0.33 gram. Find an 80% confidence interval for the average weights of Allen's hummingbirds in the study region.
(3 g, 4 g)
(3.04 g, 3.26 g)
(2.82 g, 3.26 g)
(2.28 g, 2.36 g)
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In the 3rd week of July, a random sample of 40 farming regions gave a sample mean of $6.88 per 100 pounds of watermelon. Assume the sigma is known to be $1.92 per 100 pounds. Find a 90% confidence interval for the population mean price (per 100 pounds) that farmers in this region get for their watermelon crop.
($6, $7)
($7.38, $6.38)
($6.38, $7.38)
($4.92, $8.80)
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In the 3rd week of July, a random sample of 40 farming regions gave a sample mean of $6.88 per 100 pounds of watermelon. Assume the sigma is known to be $1.92 per 100 pounds. find the sample size necessary for a 90% confidence level with maximal margin of error E=0.3 for the mean price per 100 pounds of watermelon.
109
100
111
108
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A company for a new process for manufacturing large artificial sapphires. In a trial run, 37 sapphires are produced. The distribution of weights is mound-shaped and symmetric. The mean weight for these 37 gems is 6.75 carats, and the sample standard deviation is 0.33 carat. Let mu be the mean weight for the distribution of all sapphires produced by the new process. The level of confidence is 95%. Find the margin of error E.
0.10 carat
0.11 carat
0.12 carat
0.14 carat
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of these represents the confidence interval for the population mean with known sigma?
a
b
c
d
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
If the original x distribution has a relatively small standard deviation, the confidence interval for the population mean will be relatively short.
True
False
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
For the same random sample, when the confidence level c is reduced, the confidence interval for the mean becomes shorter.
True
False
Access all questions and much more by creating a free account
Create resources
Host any resource
Get auto-graded reports

Continue with Google

Continue with Email

Continue with Classlink

Continue with Clever
or continue with

Microsoft
%20(1).png)
Apple
Others
Already have an account?
Similar Resources on Wayground
20 questions
Math 7 (Module 2 Review)
Quiz
•
7th Grade - University
20 questions
Math 6 - L4-7 - Absolute Value and Distance
Quiz
•
6th Grade - University
17 questions
Unit 1
Quiz
•
9th Grade - University
15 questions
Inner product Spaces
Quiz
•
University
15 questions
Similarity
Quiz
•
9th Grade - University
20 questions
Matrix
Quiz
•
University
19 questions
Counting Techniques and FCP
Quiz
•
8th Grade - University
20 questions
Maths (1C) Vivi Loves Science : Wind And Water - Term 2 AVV
Quiz
•
1st Grade - University
Popular Resources on Wayground
15 questions
Fractions on a Number Line
Quiz
•
3rd Grade
20 questions
Equivalent Fractions
Quiz
•
3rd Grade
25 questions
Multiplication Facts
Quiz
•
5th Grade
22 questions
fractions
Quiz
•
3rd Grade
20 questions
Main Idea and Details
Quiz
•
5th Grade
20 questions
Context Clues
Quiz
•
6th Grade
15 questions
Equivalent Fractions
Quiz
•
4th Grade
20 questions
Figurative Language Review
Quiz
•
6th Grade