Question

in a simple random sample of 50 people. it was found that the sample mean time they spend on social media each day was 42 minutes .suppose it is know that the population standard deviation is 8 minutes. construct a 90% confidence interval of the population mean time spent on social media each day

Answer #1

in
a random sample of 8 people the mean commute time to work was 34.5
minutes and the standard deviation was 7.2 minutes. A 90%
confidence interval using the t distribution was calculated to be
(29.7, 39.3). After researching commute times to work, it was found
that the population standard deviation is 9.2 minutes. Find the
margin of error and construct a 90% confidence interval using the
standard normal distribution with the appropriate calculations for
a standard deviation that is...

In a random sample of 8 people, the mean commute time to work
was 33.5 minutes and the standard deviation was 7.2 minutes. A 90%
confidence interval using the t-distribution was calculated to be
left parenthesis 28.7 comma 38.3 right parenthesis. After
researching commute times to work, it was found that the
population standard deviation is 9.3 minutes. Find the margin of
error and construct a 90% confidence interval using the standard
normal distribution with the appropriate calculations for a...

In a random sample of 50 people, the mean body mass index (BMI)
was 27.7 and the standard deviation (s) was 6.12.
Construct a 90% Confidence interval for the population mean.
Construct a 96% Confidence interval for the population mean.

1. A nutritionist wants to determine how much time nationally
people spend eating and drinking. Suppose for a random sample of
933 people age 15 or older, the mean amount of time spent eating
or drinking per day is 1.92 hours with a standard deviation of 0.58
hour.
Determine and interpret a 99% confidence interval for the mean
amount of time Americans age 15 or older spend eating and drinking
each day.
2. A simple random sample of size n...

In a random sample of 28 people, the mean commute time to work
was 33.5 minutes and the standard deviation was 7.3 minutes. Assume
the population is normally distributed and use a t-distribution to
construct a 90% confidence interval for the population mean
muμ.
What is the margin of error ofmuμ?

In a random sample of 8 people, the mean commute time to work
was 35.5 minutes and the standard deviation was 7.4 minutes. A 98%
confidence interval using the t-distribution was calculated to be
left (27.7,43.3).
After researching commute times to work, it was found that the
population standard deviation is 8.7 minutes. Find the margin of
error and construct a 98%
confidence interval using the standard normal distribution with
the appropriate calculations for a standard deviation that is
known....

In a random sample of 8 people, the mean commute time to work
was 35.5 minutes and the standard deviation was 7.3 minutes. A 98%
confidence interval using the t-distribution was calculated to be
(27.8,43.2). After researching commute times to work, it was found
that the population standard deviation is 8.9 minutes. Find the
margin of error and construct 98% confidence interval using the
standard normal distribution with the appropriate calculations for
a standard deviation that is known. Compare the...

In a random sample of 8 people, the mean commute time to work
was 35.5 minutes and the standard deviation was 7.2 minutes. A 95%
confidence interval using the t-distribution was calculated to be
left parenthesis 29.5 comma 41.5 right parenthesis. After
researching commute times to work, it was found that the
population standard deviation is 9.2 minutes. Find the margin of
error and construct a 95% confidence interval using the standard
normal distribution with the appropriate calculations for a...

a simple random sample of size n is drawn. the sample
mean, x̄, is found to be 29.5 and the sample standard deviation, s,
is found to be 8.4
a) construct a 90% confidence interval for μ if the
sample size, n, is 40
b) construct a 90% confidence interval for μ if the
sample size n is 100
c) how does increasing the sample size affect the
margin of error, E

A simple random sample of size n is drawn. The sample mean is
found to be 35.1, and the sample standard deviation is found to be
8.7.
a. Construct the 90% confidence interval if the sample size is
40.
b. Construct the 98% confidence interval if the sample size is
40.
c.How does increasing the level of confidence affect the size of
the margin of error?
d. Would you be able to compute the confidence intervals if the
sample size...

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