Question

A study by Allstate Insurance Co. finds that 82% of teenagers
have used cell phones while driving. Suppose a random sample of 100
teen drivers is taken.

**What is the standard deviation of proportion of 100 teen
drivers who use cell phone while driving? Please provide an
answer with 3 decimal points.**

Answer #1

Let X be the number of teenagers who uses cell phone while driving.

Then X follows binomial probability with

p = success probability = 0.82,

q = failure probability = 1 - p = 0.18

n = number of trials (teen drivers) = 100,

Since sample size (n) is large enough, so as per central limit theorem, the distribution of sample mean will follow normal distribution with mean and standard deviation as defined below

Mean = n*p

And standard deviation = sqrt (n*p*q) where q = 1 - p = 1 - 0.82 = 0.18

So, **standard deviation of proportion of 100 teen drivers
who use cell phone while driving** = sqrt (npq)

= sqrt (100*0.82*0.18) = sqrt (14.76) = 3.8419 =
**3.842** (answer)

A study by Allstate Insurance Co. finds that 82% of teenagers
have used cell phones while driving (The Wall Street Journal, May
5, 2010). In October 2010, Massachusetts enacted a law that forbids
cell phone use by drivers under the age of 18. A policy analyst
would like to determine whether the law has decreased the
proportion of drivers under the age of 18 who use a cell phone.
which one is correct H0 and H1 statement?
a.
H0: proportion...

A study by Allstate Insurance Co. finds that 82% of teenagers
have used cell phones while driving (The Wall Street
Journal, May 5, 2010). Suppose a random sample of 100 teen
drivers is taken. [You may find it useful to reference
the z table.]
a-1. Calculate the standard error for the sampling
distribution of the sample proportion. (Do not round
intermediate calculations. Round your answer to 4 decimal
places.)
a-2. Is the sampling distribution of the sample
proportion approximately normal?...

A recent study shows that 83% of teenagers have used cell phones
while driving. In Oct. 2010, Massachusetts enacted a law that
forbids cell phone use by drivers under the age of 18. A policy
analyst would like to test whether the law has lowered the
proportion of drivers under the age of 18 who use a cell phone. In
a random sample of 80 young drivers, 62 of them said that they used
cell phones while driving. Test the...

(Round all intermediate calculations to at least 4
decimal places.)
A recent study by Allstate Insurance Co. finds that 82% of
teenagers have used cell phones while driving (The Wall Street
Journal, May 5, 2010). In October 2010, Massachusetts enacted
a law that forbids cell phone use by drivers under the age of 18. A
policy analyst would like to determine whether the law has
decreased the proportion of drivers under the age of 18 who use a
cell phone....

1. It is advertised that the average braking distance for a
small car traveling at 65 miles per hour equals 120 feet. A
transportation researcher wants to determine if the statement made
in the advertisement is false. She randomly test drives 36 small
cars at 65 miles per hour and records the braking distance. The
sample average braking distance is computed as 114 feet. Assume
that the population standard deviation is 22 feet. a. H0: average
breaking distance for small...

Suppose a study of speeding violations and drivers who use cell
phones produced the following information. There were 25 cellphone
users who committed to speed violation. There were 75 cell phone
users committed no speed violation last year. There were total of
50 speed violation cases and 100 no speed violation cases observed.
Fill the table and find the following probabilities. (You may keep
the final answer as a fraction or 2dp) (?) ?(?) = (?) ?(?) = (?)
?(?)...

Problem 4) In 2012, the percent of American adults who owned
cell phones and used their cell phone to send or receive text
messages was at an all-time high of 80%. Assume that 80% refers to
the population parameter π. More recently in 2016, a polling firm
contacts a simple random sample of 110 people chosen from the
population of cell phone owners. The firm asks each person “do you
use your cell phone to send or receive texts? Yes...

1. When constructing a confidence interval to estimate a
population proportion, what affects the size of the margin of
error?
A. The sample size
B. The sample proportion
C. The confidence level
D. All of the above affect the size of the margin of error
E. None of the above affect the size of the margin of error
2. What percentage of couples meet through online dating
apps? A survey of a random sample of couples finds that 12% say...

In narrative essay format, I want you to address a
business/organization case study using multiple concepts from
class. The case question and case text begin on page 5 of this
document. You need to demonstrate their best understanding of
management and organizational behavior theory, and the application
of those ideas to improve the understanding of various issues. You
need to clearly identify at least 3 distinct, substantive
issues.
For each issue you need to 1), identify evidence from the case...

What tools could AA leaders have used to increase their
awareness of internal and external issues?
???ALASKA AIRLINES: NAVIGATING CHANGE
In the autumn of 2007, Alaska Airlines executives adjourned at
the end of a long and stressful day in the
midst of a multi-day strategic planning session. Most headed
outside to relax, unwind and enjoy a bonfire
on the shore of Semiahmoo Spit, outside the meeting venue in
Blaine, a seaport town in northwest
Washington state.
Meanwhile, several members of...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 3 hours ago

asked 3 hours ago

asked 3 hours ago

asked 3 hours ago

asked 3 hours ago

asked 3 hours ago