Question
In: Statistics and Probability
Over half of all American teens (ages 12 to 17 years) have an online profile, mainly...
Over half of all American teens (ages 12 to 17 years) have an online profile, mainly on Facebook. A random sample of 463 teens with profiles found that 333 included photos of themselves. (a) Give the 99.8% large-sample confidence interval for the proportion p of all teens with profiles who include photos of themselves. Large-sample Interval: to (b) Give the plus four 99.8% confidence interval for p . (The plus-four interval always pulls the results away from 0% or 100%, whichever is closer. Even though the condition for using the large-sample interval is met, the plus four interval is more trustworthy.) Plus four Interval: to
Solutions
orchestra answered 1 year agoRelated Solutions
Over half of all American teens (ages 12 to 17 years) have an online profile, mainly...
Over half of all American teens (ages 12 to 17 years) have an
online profile, mainly on Facebook. A random sample of 517 teens
with profiles found that 399 included photos of themselves.
(a) Give the 99% large-sample confidence interval for the
proportion p of all teens with profiles who include photos
of themselves.
Large-sample Interval: to
(b) Give the plus four 99% confidence interval for p .
(The plus-four interval always pulls the results away from 0% or
100%,...
Over half of all American teens (ages 12 to 17 years) have an online profile, mainly...
Over half of all American teens (ages 12 to 17 years) have an
online profile, mainly on Facebook. A random sample of 471 teens
with profiles found that 301 included photos of themselves. (a)
Give the 90% large-sample confidence interval for the proportion p
of all teens with profiles who include photos of themselves.
Large-sample Interval:
(b) Give the plus four 90% confidence interval for p . (The
plus-four interval always pulls the results away from 0% or 100%,
whichever...
A survey of 1060 randomly selected US teens ages 13 to 17 found that 605 of...
A survey of 1060 randomly selected US teens ages 13 to 17 found
that 605 of them say they have made a new friend online.
Find and interpret a 90% confidence interval for the proportion
of US teens who have made a new friend online.
Fill in the blanks
a) The scenario above represents (write either
test or CI):
b) The population parameter (write either single
proportion or single mean):
c) The sample size:
d) The sample statistic (round decimal...
The Pew Internet and American Life Project reports that young people ages 12-17 send a mean...
The Pew Internet and American Life Project reports that young
people ages 12-17 send a mean of 60 text messages per day. A random
sample of 40 young people showed a sample mean of 69 texts per day.
Assume σ = 28 for the population.
Using a significance level of α = 0.05, test whether the
population mean number of text messages per day is greater than
60.
i. What is the null hypothesis?
ii. What is the alternative hypothesis?...
A paper reported that in a representative sample of 291 American teens age 16 to 17,...
A paper reported that in a representative sample of 291 American
teens age 16 to 17, there were 79 who indicated that they had sent
a text message while driving. For purposes of this exercise, assume
that this sample is a random sample of 16- to 17-year-old
Americans. Do these data provide convincing evidence that more than
a quarter of Americans age 16 to 17 have sent a text message while
driving? Test the appropriate hypotheses using a significance level...
In 2015–2016 39.8% of American adults, ages 20 years and over were obese and another 31.8%...
In 2015–2016
39.8% of American adults, ages 20 years and
over were obese and another 31.8% were
overweight.
18.5% of American adolescents, ages 12-19
years were obese
Using proper essay format, research and describe the
physiological (biological) effects of obesity on the human
body.
Please mention some of the causes of the disorder such as genes,
hormones, intestinal bacteria, existing medical conditions and
behaviors.
(Please be specific and give the name of genes, bacteria,
hormones and other factors involved in...
. A poll found that 36% of U.S. teens aged from 13 to 17 years old...
. A poll found that 36% of U.S. teens aged from 13 to 17 years
old have a computer with Internet access in their rooms. The poll
was based on a random sample of 1028 teens.
A) Give the 98% confidence interval for the population
proportion, p.
B) What does the interval in part (A) mean in this context. Be
as specific as possible
C) How big of a sample must we take in order to ensure that we
are...
Seventy percent of children ages 12 to 17 keep at least part of their savings in...
Seventy percent of children ages 12 to 17 keep at
least part of their savings in a savings account. You randomly
select 45 children and ask them if they keep at least part of their
savings in a savings account. Find the probability that more than
40 children will say yes using the binomial distribution to find
the exact answer. List n, p, q, and x.
Please DO NOT use the normal distribution to
approximate the binomial distribution.
Over the past 50 years, one-half of all cities that apply have received mass transportation grants from the federal government.
Over the past 50 years, one-half of all cities that apply have received mass transportation grants from the federal government. In the last round of grants, eight southern cities applied but none received a grant. Assume that all cities were equally qualified to receive the grants. What is the probability that no southern city receives a grant?
Truthfulness in online profiles. Many teens have posted profiles on a social- networking website. A sample...
Truthfulness in online profiles. Many teens have posted profiles
on a social-
networking website. A sample survey in 2007 asked a random sample
of teens
with online profiles if they included false information in their
profiles. Of 170
younger teens (aged 12 to 14), 117 said yes. Of 317 older teens
(aged 15 to 17),
152 said yes.
16
(a) Do these samples satisfy the guidelines for the large-sample
confidence
interval?
(b) Give a 95% confidence interval for the difference...
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