The distribution of weights of a large group of high school students is normally distributed with u-55 kg and o-5 kg. Which of the following is true? a. Half of them can be expressed to weigh less than 55 kg. b. All statements are true. C. About 5 percent will weigh more than 63 kg. d. About 2.5 percent will be below 45 kg.

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
icon
Related questions
icon
Concept explainers
Topic Video
Question

See attached file to answer the questions:

Instruction: Please help me to answer all the questions correctly.
The distribution of weights of a large group of high school students is normally distributed with µ=55
kg and o-5 kg. Which of the following is true?
a. Half of them can be expressed to weigh less than 55 kg.
b. All statements are true.
C. About 5 percent will weigh more than 63 kg.
d. About 2.5 percent will be below 45 kg.
The marks on a statistics test are normally distributed with a mean of 62 and a variance of 225. If the
instructor wishes to assign B's or higher to the top 30% of the students in the class, what mark is
required to get a B or higher?
а. 74.62
b. 71.53
c. 68.74
d. 69.52
The distribution of weights is a large group is approximately normally distributed. The mean is 80 kg.
and approximately 68% of the weights are between 70 and 90 kg. What is the standard deviation of
the distribution of weights?
а. 20
b. 5
C. 10
d. 15
A recent news program reported that the presidential approval rate was 51% with a margin of error
of t 4%. What is meant by + 4%?
a. The proportion of Americans who approve the president is between 47% and 55%.
b. Unless the true proportion of Americans who approve of the president is between 47% and 55%,
it is unlikely we could have obtained from these sample results.
c. The president's approval rating from those sampled was between 47% and 55%.
d. 4% of the respondents were undecided.
Which one of the following statements about a confidence interval is TRUE?
a. The width of confidence interval is increased when the sample size is increased.
b. Changes in the required level of confidence, 1-alpha, do not affect the width of the confidence
interval.
c. The wider the confidence interval, the least precise the estimate of the population parameter
d. The width of confidence interval is increased when the sample size is decreased.
Transcribed Image Text:Instruction: Please help me to answer all the questions correctly. The distribution of weights of a large group of high school students is normally distributed with µ=55 kg and o-5 kg. Which of the following is true? a. Half of them can be expressed to weigh less than 55 kg. b. All statements are true. C. About 5 percent will weigh more than 63 kg. d. About 2.5 percent will be below 45 kg. The marks on a statistics test are normally distributed with a mean of 62 and a variance of 225. If the instructor wishes to assign B's or higher to the top 30% of the students in the class, what mark is required to get a B or higher? а. 74.62 b. 71.53 c. 68.74 d. 69.52 The distribution of weights is a large group is approximately normally distributed. The mean is 80 kg. and approximately 68% of the weights are between 70 and 90 kg. What is the standard deviation of the distribution of weights? а. 20 b. 5 C. 10 d. 15 A recent news program reported that the presidential approval rate was 51% with a margin of error of t 4%. What is meant by + 4%? a. The proportion of Americans who approve the president is between 47% and 55%. b. Unless the true proportion of Americans who approve of the president is between 47% and 55%, it is unlikely we could have obtained from these sample results. c. The president's approval rating from those sampled was between 47% and 55%. d. 4% of the respondents were undecided. Which one of the following statements about a confidence interval is TRUE? a. The width of confidence interval is increased when the sample size is increased. b. Changes in the required level of confidence, 1-alpha, do not affect the width of the confidence interval. c. The wider the confidence interval, the least precise the estimate of the population parameter d. The width of confidence interval is increased when the sample size is decreased.
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 3 steps with 3 images

Blurred answer
Knowledge Booster
Sample space, Events, and Basic Rules of Probability
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.
Recommended textbooks for you
MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
Statistics
ISBN:
9781119256830
Author:
Amos Gilat
Publisher:
John Wiley & Sons Inc
Probability and Statistics for Engineering and th…
Probability and Statistics for Engineering and th…
Statistics
ISBN:
9781305251809
Author:
Jay L. Devore
Publisher:
Cengage Learning
Statistics for The Behavioral Sciences (MindTap C…
Statistics for The Behavioral Sciences (MindTap C…
Statistics
ISBN:
9781305504912
Author:
Frederick J Gravetter, Larry B. Wallnau
Publisher:
Cengage Learning
Elementary Statistics: Picturing the World (7th E…
Elementary Statistics: Picturing the World (7th E…
Statistics
ISBN:
9780134683416
Author:
Ron Larson, Betsy Farber
Publisher:
PEARSON
The Basic Practice of Statistics
The Basic Practice of Statistics
Statistics
ISBN:
9781319042578
Author:
David S. Moore, William I. Notz, Michael A. Fligner
Publisher:
W. H. Freeman
Introduction to the Practice of Statistics
Introduction to the Practice of Statistics
Statistics
ISBN:
9781319013387
Author:
David S. Moore, George P. McCabe, Bruce A. Craig
Publisher:
W. H. Freeman

Expert Answers to Latest Homework Questions

Q: Variables Name wage hours IQ KWW educ exper tenure age married black south urban sibs brthord meduc…
Q: Solve this problem and show all of the work
Q: Solve this problem and show all of the work
Q: Solve this problem and show all of the work
Q: Numerical ana
Q: Solve this problem and show all of the work
Q: Numerical an
Q: Solve this problem and show all of the work
Q: Numerical ana
Q: What happened in Case 4.1 In re Subway Sandwich Marketing & Sales Practices Litigation, T.…
Q: What happened in Case 4.1 In re Subway Sandwich Marketing & Sales Practices Litigation, T.…
Q: What happened in Case 4.1 In re Subway Sandwich Marketing & Sales Practices Litigation, T.…
Q: What happened in Case 4.1 In re Subway Sandwich Marketing & Sales Practices Litigation, T.…
Q: What happened in Case 4.1 In re Subway Sandwich Marketing & Sales Practices Litigation, T.…
Q: Part A The man pulls on the rope with a force of F = 30 N as shown in (Figure 1). Figure 1.5 m 3 m.…
Q: 4 Part A The tool is used to shut off gas valves that are difficult to access (Figure 1). Figure…
Q: Can you please simplify (the domain is not empty) ∃xF (x) → ¬∃x(F (x) ∨ ¬G(x)). Fo
Q: Please solve and answer the question correctly please. Thank you!!
Q: Please solve and answer this question correctly please. Thank you!!
Q: Wavelength (nm) I'm not sure what equation I can come up with other than the one generated with my…
Q: Please solve and answer all parts of the question correctly please. Thank you!!