11. Distance Traveled to Work A recent study of 28 randomly selected employees of a company showed that the mean of the distance they traveled to work was 14.3 miles. The standard deviation of the sample was 2.0 miles. Find the 95% confidence interval of the true mean. If a manager wanted to be sure that most of his employees would not be late, how much time would he suggest they allow for the commute if the average speed were 30 miles per hour? 12. Thunderstorm Speeds A meteorologist who sampled 13 randomly selected thunderstorms found that the average speed at which they traveled across a certain state was 15.0 miles per hour. The standard deviation of the sample was 1.7 miles per hour. Find the 99% confidence interval of the mean. If a meteorologist wanted to use the highest speed to predict the times it would take storms to travel across the state in order to issue warnings, what figure would she likely use? 13. Students per Teacher in U.S. Public Schools The national for the number of students per teacher for all U.S. public schools is 15.9,A random sample of 12 school districts from a moderately populated area showed that the mean number of students per teacher was 19.2 with a variance of 4.41. Estimate the true mean number of students per teacher with 95% confidence. How does your estimate compare with the national average? average Source: World Almanac. 4. Social Networking Sites A recent survey of 8 randomly selected social networking sites has a mean of 7-19

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Concept explainers

Question

Assume that all variables are approximately normally distributed.

Help me with 13 please.

11. Distance Traveled to Work A recent study of 28
randomly selected employees of a company showed
that the mean of the distance they traveled to work was
14.3 miles. The standard deviation of the sample was
2.0 miles. Find the 95% confidence interval of the true
mean. If a manager wanted to be sure that most of his
employees would not be late, how much time would he
suggest they allow for the commute if the average speed
were 30 miles per hour?
12. Thunderstorm Speeds A meteorologist who sampled
13 randomly selected thunderstorms found that the
average speed at which they traveled across a certain
state was 15.0 miles per hour. The standard deviation of
the sample was 1.7 miles per hour. Find the 99%
confidence interval of the mean. If a meteorologist
wanted to use the highest speed to predict the times
it would take storms to travel across the state in
order to issue warnings, what figure would she likely
use?
13. Students per Teacher in U.S. Public Schools The
national for the number of students per teacher
for all U.S. public schools is 15.9,A random sample of 12
school districts from a moderately populated area showed
that the mean number of students per teacher was 19.2
with a variance of 4.41. Estimate the true mean number of
students per teacher with 95% confidence. How does your
estimate compare with the national average?
average
Source: World Almanac.
4. Social Networking Sites A recent survey of 8 randomly
selected social networking sites has a mean of
7-19

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

Expert Solution

Trending now

This is a popular solution!

Step by step

Solved in 3 steps with 3 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

$Basics of Inferential Statistics$

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.

Similar questions