Question
In: Statistics and Probability
In 2018, 43% of American households still had a landline phone. A random sample of 12...
In 2018, 43% of American households still had a landline phone.
A random sample of 12 households is selected.
a) Find the probability that the sample contains exactly 4 households with a landline.
b) Find the probability that at least one household has a landline.
c) Find the mean and standard deviation for the number of households with a landline.
Solutions
orchestra answered 1 year agoRelated Solutions
In a representative sample of 50 American households, 32 households had a pet. Use this sample...
In a representative sample of 50 American households, 32
households had a pet. Use this sample data to answer the following
questions.
A. Use Minitab Express to
construct a 95% confidence interval to estimate the proportion of
all American households with a pet. Show how you checked
assumptions. If assumptions were met, use the normal approximation
method. Remember to include all relevant Minitab Express output and
to clearly identify your answer. Other than checking assumptions,
do not do any hand...
In a representative sample of 50 American households, 32 households had a pet. Use this sample...
In a representative sample of 50 American households, 32
households had a pet. Use this sample data to answer the following
questions. A. Use Minitab Express to construct a 95% confidence
interval to estimate the proportion of all American households with
a pet. Show how you checked assumptions. If assumptions were met,
use the normal approximation method. Remember to include all
relevant Minitab Express output and to clearly identify your
answer. Other than checking assumptions, do not do any hand...
In 2015, 45% of Americans had only a cell phone (and no landline). A research firm...
In 2015, 45% of Americans had only a cell phone (and no
landline). A research firm plans to investigate whether this
percentage has changed in the meantime. In a recent sample of 1252
people, 613 reported having only a cell phone.
Fill in the blanks: H0:p=________ and Ha:p ? __________
Calculate p?
Are both np0 and (1-p0)at least 15? Show the calculations.
Draw a bell (normal) curve with the mean and two standard errors
(in both directions) marked. Mark p?...
It is reported that 25% of American households use a cell phone exclusively for their telephone...
It is reported that 25% of American households use a cell phone
exclusively for their telephone service. In a sample of eleven
households, find the probability that:
(a)
None use a cell
phone as their exclusive service. (Round your answer to 4
decimal places.)
Probability
(b)
At least one
uses the cell exclusively. (Round your answer to 4 decimal
places.)
Probability
(c)
At least five
use the cell phone. (Round your answer to 4 decimal
places.)
...
Confidence Intervals In a random sample of 1100 American adults it was found that 320 had...
Confidence Intervals
In a random sample of 1100 American adults it was found that 320
had hypertension (high-blood pressure). The US Department of Health
and Human Services (HHS) wants the population proportion of
hypertension to 16% by 2022.
Find the 95% confidence interval for the proportion of all adult
Americans that have hypertension.
Interpret the confidence interval in the words of the
problem.
Find the error bound.
Does this data and analysis provide evidence that the population
proportion of hypertension...
In 2018 a random sample of 1,200 American adults was asked the question, “What do you...
In 2018 a random sample of 1,200 American adults was asked the
question, “What do you think is the ideal number of children for a
family to have?” Results showed that 40% of respondents said three
or more children is ideal. I. Calculate a 95% confidence interval
for the proportion of Americans who think that three or more
children is the ideal family size. The multiplier for a 95%
confidence interval is 1.960. Give your answer to 4 decimal places....
Question 12 A simple random sample of 12 e-readers of a certain type had the following...
Question 12
A simple random sample of 12 e-readers of a certain type had the
following minutes of battery life.
287, 311, 262, 392, 313, 263, 293, 316, 286, 301, 287, 291
Assume that it is reasonable to believe that the population is
approximately normal and the population standard deviation is 62.
What is the upper bound of the 95% confidence interval for the
battery life for all e-readers of this type?
Round your answer to one decimal places (for...
In 2012, seventy percent of Canadian households had an internet connection. A sample of 484 households...
In 2012, seventy percent of Canadian households had an internet
connection. A sample of 484 households taken in 2013 showed that
75% of them had an internet connection. We are interested in
determining whether or not there has been a significant increase in
the percentage of the Canadian households that have internet
connections. Please design your hypothesis test (2 points), conduct
the test (2 points ) and draw your conclusion accordingly (1
point)
A random sample of 73 firms in an industrial area indicated that 12 of them had...
A random sample of 73 firms in an industrial area indicated that
12 of them had handled their industrial waste incorrectly for
disposal. Test to see if the proportion of firms handling their
industrial waste incorrectly for disposal is significantly lower
than an assumed 20% overall. Use a 3% significance level.
According to the 2018 American Community Survey, 80% of the 120 million households in the US...
According to the 2018 American Community Survey, 80% of the 120
million households in the US have broadband Internet subscriptions.
Consider drawing a random sample of n = 256 households
from all households in the US. Let p̂ denote the sample
proportion of households that have broadband Internet
subscriptions.
a) State the mean, standard deviation, and the approximate shape
for the sampling distribution of p̂ .
b) Based on your answer in part a, what is the approximate
probability that...
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