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Chapter 8: Q. 59 (page 518)
59.Blood pressure A medical study finds that and for the seated systolic blood pressure of the members of one treatment group. What is the standard error of the mean? Interpret this value in context.
The standard error of the mean is .
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A milk processor monitors the number of bacteria per millilitre in raw milk received at the factory. A random sample of 10 one-millilitre specimens of milk supplied by one producer gives the following data:
5370 4890 5100 4500 5260 5150 4900 4760 4700 4870
Construct and interpret a 90% confidence interval for the population mean .
Got shoes? How many pairs of shoes, on average, do female teens have? To find out, an AP Statistics class conducted a survey. They selected an SRS of female students from their school. Then they recorded the number of pairs of shoes that each student reported having. Here are the data:
It鈥檚 critical Find the appropriate critical value for constructing a confidence interval in each of the following settings.
(a) Estimating a population proportion p at a confidence level based on an SRS of size .
(b) Estimating a population mean M at a confidence level based on an SRS of size .
One reason for using a distribution instead of the standard Normal curve to find critical values when calculating a level C confidence interval for a population mean is that
(a) can be used only for large samples.
(b) requires that you know the population standard deviation .
(c) requires that you can regard your data as an SRS from the population.
(d) the standard Normal table doesn't include confidence levels at the bottom.
(e) a critical value will lead to a wider interval than a critical value.
Whelks and mussels The small round holes you often see in sea shells were drilled by other sea creatures, who ate the former dwellers of the shells. Whelks often drill into mussels, but this behavior appears to be more or less common in different locations. Researchers collected whelk eggs from the coast of Oregon, raised the whelks in the laboratory, then put each whelk in a container with some delicious mussels. Only whelks drilled into a mussel. The researchers want to estimate the proportion of Oregon whelks that will spontaneously drill into mussels.
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