Question

In a random sample of 1000 families owning Netflix accounts in the charlottesville, it is found that 688 watched the Spanish TV series “Money Heist’’. Find a 95% confidence interval for the actual proportion of families with Netflix accounts in charlottesville that watched “Money Heist”

Answer #1

In a random sample of n = 750 families owning television sets in
a city of Hamilton Canada, it was found that x = 340 subscribed to
HBO. Find the 95% confidence interval for the mean of all such
containers assuming an approximate normal distribution.
What statistical table will be used?
What is the tabular value?
What is the lower confidence limit?
What is the upper confidence limit?

3. In a random sample of 600 families in the city of Ottawa
360 live in a rental housing. Find a 95% confidence interval for
the proportion of the renters in Ottawa.

In a pool of n = 1000 randomly selected teenagers, 450 indicated
that they like Netflix.
a) Construct a 95% confidence interval for the proportion of
teenagers who like Netflix and interpret it.
b) Why the result in a) is approximately valid.
c) If you wish to estimate the proportion of teenagers who like
Netflix correct to within 0.025 with 95% confidence, how large
should the sample size n be?

a
random sample of 1000 people found that 250 people believe ghosts
exists. assuming that the sample is representative of the
population, construct a 95% confidence interval on the population
proportion who belive in ghosts. what is the margin of error for
this problem?

A
nutrionist found that in a random sample of 80 families 25%
indicated that they ate fruit at least 3 times a week. find the 99%
confidence interval if the true proportions if families who said
they ate fruit 3 times a week.

A survey found that in a random sample of 73 families, 27 owned
dogs. A survey done 15 years ago found that in a random sample of
69 families, 26 owned dogs. At α = 0.05, has the proportion of dog
owners changed over the 15-year period? USe the P-value method.

In a random sample of 1000 students, 80% were in favor of longer
hours at the school library.
What is the standard error of the sample proportion?
Calculate the margin of error. Calculate a 95% confidence
interval for proportion of students favoring longer library hours.
Interpret.

A random sample of 1000 families of Bus County showed that 685
families adopted at least one dog. Use these numbers to test the
claim that more than 70% of families in Bus County adopted at least
one dog, using α =0.10.

Question 4 Iowa Families Question1 For a random sample of 64
Iowa homes, average weekly food expenditure turns out to be $160,
with a standard devaition of $64. Let mu denote the mean weekly
food expenditure for Iowa families. Find a 95% confidence Interval
for μ.

You select a random sample of n=14 families in your neighborhood
and find the following family sizes (number of people in the
family) 1,2,5,4,3,1,2,2,1,2,12,3,4 a. What is the best estimate for
the mean family size for the population of all families in a
country? (round to the nearest tenth as needed) b. What is the 95%
confidence interval for the estimate? __

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