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How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters? We want 90% confidence that the sample mean is within 4 minutes of the population mean, and the population standard deviation is known to be 12 minutes.

Answer #1

A. How many commuters must be randomly selected to estimate the
mean driving time of Chicago commuters? We want 90% confidence that
the sample mean is within 4 minutes of the population mean, and the
population standard deviation is known to be 12 minutes.
B. The health of employees is monitored by periodically weighing
them in. A sample of 54 employees has a mean weight of 183.9 lb.
Assuming that σ is known to be 121.2 lb, create as 85%...

9.) How many commuters must be randomly selected to estimate the
mean driving time of Chicago commuters? We want 95% confidence that
the sample mean is within 3 minutes of the population mean, and the
population standard deviation is known to be 12 minutes.
A. 61 commuters
B. 8 commuters
C. 62 commuters
D. 7 commuters
10.) If we increase our sample size the width of the confidence
interval will
A. increase
B. stay the same
C. decrease
11.) Data...

Use the given information to find the minimum sample
size required to estimate an unknown population mean
.
How many commuters must be randomly selected to estimate the mean
driving time of Chicago commuters? We want 98% confidence that the
sample mean is within 3 minutes of the population mean, and the
population standard deviation is known to be 8 minutes.

How many women must be randomly selected to estimate the mean
weight of women in one age group. We want 90% confidence that the
sample mean is within 2.3lb of the population mean, and the
population standard deviation is known to be 14 lb.
143
202
126
101

7. We want to estimate the mean amount of time people spend on
Facebook each month.. How many randomly selected Facebook users
must be surveyed if we want the sample mean to be in error by no
more than 15 minutes, with a 95% confidence? A preliminary study
suggests that the population standard deviation is 210 minutes.

Assume that we want to estimate the mean IQ score for the
population of statistics students. How many students must be
randomly selected for IQ tests if we want 90% confidence that the
sample mean is within 4 IQ points of the population mean and the
population standard deviation o = 15?

How
many business students must be randomly selected to estimate the
percentage of using a laptop? We want 91% confidence that the same
percentage is within three percentage points of the population
percentage?

Use the given information to find the minimum sample size
required to estimate an unknown population mean μ.
How many women must be randomly selected to estimate the mean
weight of women in one age group. We want 90% confidence that the
sample mean is within 2.0 lb of the population mean, and the
population standard deviation is known to be 27 lb.

Use the given information to find the minimum sample size
required to estimate an unknown population mean μ.
How many students must be randomly selected to estimate the mean
weekly earnings of students at one college? We want 95% confidence
that the sample mean is within $5 of the population mean, and the
population standard deviation is known to be $60.

You want to estimate the mean amount of time internet users
spend on Facebook each month. How many internet users must be
surveyed to be 90% confident that your sample mean is within 10
minutes of the population mean? Use 210 minutes as an estimate of
the population standard deviation.
Please be detailed and thorough!!

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