Question

The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean of 0.912 g and a standard deviation of 0.311 g. The company that produces these cigarettes claims that it has now reduced the amount of nicotine. In what range would you expect to find the middle 80% of amounts of nicotine in these cigarettes (assuming the mean has not changed)?

Between and . (Enter your answers in ascending order...smaller on left, larger on right. Also, enter your answers accurate to four decimal places.)

If you were to draw samples of size 40 from this population, in what range would you expect to find the middle 80% of most average amounts of nicotine in the cigarettes in the sample?

Between and . (Enter your answers in ascending
order...smaller on left, larger on right. Also, enter your answers
accurate to four decimal places.)

Answer #1

The amounts of nicotine in a certain brand of cigarette are
normally distributed with a mean of 0.889 g and a standard
deviation of 0.307 g. The company that produces these cigarettes
claims that it has now reduced the amount of nicotine. In what
range would you expect to find the middle 70% of amounts of
nicotine in these cigarettes (assuming the mean has not
changed)?
Between and . (Enter your answers in ascending order...smaller
on left, larger on right....

The amounts of nicotine in a certain brand of cigarette are
normally distributed with a mean of 0.977 g and a standard
deviation of 0.313 g. The company that produces these cigarettes
claims that it has now reduced the amount of nicotine. In what
range would you expect to find the middle 50% of amounts of
nicotine in these cigarettes (assuming the mean has not changed)?
Between and . If you were to draw samples of size 59 from this...

The amounts of nicotine in a certain brand of cigarette are
normally distributed with a mean of 0.894 g and a standard
deviation of 0.326 g. The company that produces these cigarettes
claims that it has now reduced the amount of nicotine. The
supporting evidence consists of a sample of 32 cigarettes with a
mean nicotine amount of 0.825 g. Assuming that the given mean and
standard deviation have NOT changed, find the probability of
randomly seleting 32 cigarettes with...

The amounts of nicotine in a certain brand of cigarette are
normally distributed with a mean of 0.883 g and a standard
deviation of 0.313 g. The company that produces these cigarettes
claims that it has now reduced the amount of nicotine. The
supporting evidence consists of a sample of 32 cigarettes with a
mean nicotine amount of 0.828 g.
Assuming that the given mean and standard deviation have
NOT changed, find the probability of randomly seleting 32
cigarettes with...

The amounts of nicotine in a certain brand of cigarette are
normally distributed with a mean of 0.939 g and a standard
deviation of 0.302 g. The company that produces these cigarettes
claims that it has now reduced the amount of nicotine. The
supporting evidence consists of a sample of 41 cigarettes with a
mean nicotine amount of 0.849 g. Assuming that the given mean and
standard deviation have NOT changed, find the probability of
randomly selecting 41 cigarettes with...

The nicotine content in cigarettes of a certain brand is
normally distributed with mean (in milligrams) μ and
standard deviation σ=0.1. The brand advertises that the
mean nicotine content of their cigarettes is 1.5 mg. Now, suppose a
reporter wants to test whether the mean nicotine content is
actually higher than advertised. He takes measurements from a SRS
of 10 cigarettes of this brand. The sample yields an average of
1.55 mg of nicotine. Conduct a test using a significance...

The lengths of pregnancies in a small rural village are normally
distributed with a mean of 266.1 days and a standard deviation of
13.1 days.
In what range would you expect to find the middle 68% of most
pregnancies?
Between ___ and ___.
Enter your answers as numbers. Your answers should be accurate
to 1 decimal places.
Enter your answers as numbers. Your answers should be accurate to 1
decimal places.

The lengths of pregnancies in a small rural village are normally
distributed with a mean of 265 days and a standard deviation of 16
days.
In what range would you expect to find the middle 95% of most
pregnancies?
Between and .
If you were to draw samples of size 59 from this population, in
what range would you expect to find the middle 95% of most averages
for the lengths of pregnancies in the sample?
Between and .
Enter your answers...

The lengths of pregnancies in a small rural village are normally
distributed with a mean of 270 days and a standard deviation of 16
days. In what range would you expect to find the middle 95% of most
pregnancies? Between and . If you were to draw samples of size 43
from this population, in what range would you expect to find the
middle 95% of most averages for the lengths of pregnancies in the
sample? Between and . Enter...

The lengths of pregnancies in a small rural village are normally
distributed with a mean of 263 days and a standard deviation of 15
days.
In what range would you expect to find the middle 68% of most
pregnancies?
Between ................... and .............
If you were to draw samples of size 34 from this population, in
what range would you expect to find the middle 68% of most averages
for the lengths of pregnancies in the sample?
Between ........... and...

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