a. Decide whether, on average, the net percentage gain for jobs exceeds 0.2. Assume a population standard deviation of 0.39. Apply the one-mean z-test with a 1% significance level. State the hypotheses for the one-mean z-test. Ho: H V Ha:H (Type integers or decimals. Do not round.)

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9.4.89
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A researcher examined gross job gains and losses as a percentage of the average of previous and current employment figures. A simple random sample of 20 quarters
provided the net percentage gains (losses are negative gains) for jobs as shown in the accompanying table. Complete parts (a) through (d) below.
Click here to view the net percentage jobgain data.
Click here to view Page 1 of the table of areas under the standard normal curve.
Click here to view Page 2 of the table of areas under the standard normal curve.
a. Decide whether, on average, the net percentage gain for jobs exceeds 0.2. Assume a population standard deviation of 0.39. Apply the one-mean z-test with a 1%
significance level.
State the hypotheses for the one-mean z-test.
Ho: H
%
Ha: H
%
(Type integers or decimals. Do not round.)
Transcribed Image Text:9.4.89 Question Help A researcher examined gross job gains and losses as a percentage of the average of previous and current employment figures. A simple random sample of 20 quarters provided the net percentage gains (losses are negative gains) for jobs as shown in the accompanying table. Complete parts (a) through (d) below. Click here to view the net percentage jobgain data. Click here to view Page 1 of the table of areas under the standard normal curve. Click here to view Page 2 of the table of areas under the standard normal curve. a. Decide whether, on average, the net percentage gain for jobs exceeds 0.2. Assume a population standard deviation of 0.39. Apply the one-mean z-test with a 1% significance level. State the hypotheses for the one-mean z-test. Ho: H % Ha: H % (Type integers or decimals. Do not round.)
-8.2.71
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Some governments have set a safety limit for cadmium in dry vegetables at 0.5 part per million (ppm). Researchers measured the cadmium levels in a random sample of
a certain type of edible mushroom. The accompanying table shows the data obtained by the researchers. Find and interpret a 90% confidence interval for the mean
cadmium level of all mushrooms of this type. Assume a population standard deviation of cadmium levels in mushrooms of this type of 0.27 ppm. (Note: The sum of the
data is 6.31 ppm.)
Click here to view the data.
Click here to view_page 1 of the table of areas under the standard normal curve.
Click here to view page 2 of the table of areas under the standard normal curve.
The 90% confidence interval is from
ppm to
ppm.
(Round to three decimal places as needed.)
Transcribed Image Text:-8.2.71 Question Help Some governments have set a safety limit for cadmium in dry vegetables at 0.5 part per million (ppm). Researchers measured the cadmium levels in a random sample of a certain type of edible mushroom. The accompanying table shows the data obtained by the researchers. Find and interpret a 90% confidence interval for the mean cadmium level of all mushrooms of this type. Assume a population standard deviation of cadmium levels in mushrooms of this type of 0.27 ppm. (Note: The sum of the data is 6.31 ppm.) Click here to view the data. Click here to view_page 1 of the table of areas under the standard normal curve. Click here to view page 2 of the table of areas under the standard normal curve. The 90% confidence interval is from ppm to ppm. (Round to three decimal places as needed.)
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