Question

*n* = 14 samples are taken from a stream; the mean
pollutant level is 16.4 mg/l, and the standard deviation is 5.3.
Test the hypothesis that the true mean is no different than the
"normal" level of 12.5 mg/l. State the null and alternative
hypotheses, and use a Type I error level of 5%. (4)

Answer #1

n = 14 samples are taken from a stream; the mean
pollutant level is 16.4 mg/l, and the standard deviation is 5.3.
Test the hypothesis that the true mean is no different than the
"normal" level of 12.5 mg/l. State the null and alternative
hypotheses, and use a Type I error level of 5%.

n = 14 samples are taken from a stream; the mean pollutant level
is 16.4 mg/l, and the standard deviation is 5.3. Test the
hypothesis that the true mean is no different than the "normal"
level of 12.5 mg/l. State the null and alternative hypotheses, and
use a Type I error level of 5%.
Thank you!

2. n = 14 samples are taken from a stream; the mean
pollutant level is 16.4 mg/l, and the standard deviation is 5.3.
Test the hypothesis that the true mean is no different than the
"normal" level of 12.5 mg/l. State the null and alternative
hypotheses, and use a Type I error level of 5%.

2. n = 14 samples are taken from a stream; the mean
pollutant level is 16.4 mg/l, and the standard deviation is 5.3.
Test the hypothesis that the true mean is no different than the
"normal" level of 12.5 mg/l. State the null and alternative
hypotheses, and use a Type I error level of 5%.
PLEASE HELP!

suppose n = 13 samples are taken from a stream; the mean
pollutant level is 16.7 mg/l, and the standard deviation is 5.1.
Use the p-value approach and a significance level of 0.05 to test
the hypothesis that the true mean is no different than the ‘normal’
level of 14.2 mg/l. Write down the null and alternative hypotheses,
find the test statistic and the p-value, and state your
conclusion.

A researcher suspects that the mean pollutant level in a region
is higher than the state average of 4.3 grams/cubic
liter. Data are collected; from 56 samples, the mean is
found to be 5.4, with a standard deviation of 5.0. Test
the null hypothesis that the true mean in the region is 4.3,
against the alternative that it is higher. State the
null and alternative hypotheses, give the critical value, find the
test statistic, make a decision, and give the p-value.

A researcher suspects that the mean pollutant level in a region
is higher than the state average of 4.3 grams/cubic liter. Data are
collected; from 56 samples, the mean is found to be 5.4, with a
standard deviation of 5.0. Test the null hypothesis that the true
mean in the region is 4.3, against the alternative that it is
higher. State the null and alternative hypotheses, give the
critical value, find the test statistic, make a decision, and give
the...

A researcher suspects that the mean pollutant level in a region
is higher than the state average of 4.3 grams/cubic liter. Data are
collected; from 56 samples, the mean is found to be 5.4, with a
standard deviation of 5.0. Test the null hypothesis that the true
mean in the region is 4.3, against the alternative that it is
higher. State the null and alternative hypotheses, give the
critical value, find the test statistic, make a decision, and give
the...

5. A researcher suspects that the mean pollutant level in a
region is higher than the state average of 4.3 grams/cubic liter.
Data are collected; from 56 samples, the mean is found to be 5.4,
with a standard deviation of 5.0. Test the null hypothesis that the
true mean in the region is 4.3, against the alternative that it is
higher. State the null and alternative hypotheses, give the
critical value, find the test statistic, make a decision, and give...

A sample of 16 cookies is taken to test the claim that each
cookie contains at least 9 chocolate chips. The average number of
chocolate chips per cookie in the sample was 7.875 with a standard
deviation of 1. Assume the distribution of the population is
normal. Please give the answers clearly labeled in order.
Thanks :)
a.
State the null and alternative
hypotheses.
b.
Using a critical value, test the
hypothesis at the 1% level of significance.
c.
Using...

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