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The researchers recruited 917 patients who had tested positive for Staphylococcus aureus and randomly assigned them to receive a nasal ointment that contained either a staph-killing solution or a placebo. Post-surgery infections with S. Aureus were then recorded. In the treatment, group, 17 of 504 patients developed a staph infection, compared with 32 of 413 patients in the placebo group.
Is there good evidence that treatment of staph-positive patients before surgery reduces the rate of post-surgical staph infection? State the null and alternative hypotheses, find the test statistic, and use either software or the bottom row of Table C for the P-value.
The cost accountant for Blue Pharmaceuticals has informed you that the company's materials quantity variance for the drug Allegro was exactly equal to its materials price variance for the year.
Use the traditional method to test the given hypothesis. Assume that the population is normally distributed and that the sample has been randomly selected.
What is the probability that an individuals clotting time will be more than 3 seconds and less than 11? Assume a normal distribution
Using your own experience, estimate the probability the local weather forecast is correct. Explain the rationale behind your estimate.
The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours.
Consider the following two columns that describe different types of data: A. Nominal 1. Qualitative B. Discrete 2. Quantitative C. Ordinal D. Continuous. The correctly paired groupings of the two columns is:
Suppose three unfair coins are tossed, a nickel, a dime, and a quarter. The probability of tossing a head on the nickel is 0.35; the probability of tossing a head on the dime is 0.20
Develop a seasonally adjusted forecast model for these sandwich sales data. Forecast demand for each season for 2004 using a linear trend line estimate for sales in 2004. Do the data appear to have a seasonal pattern?
An election poll reported that a candidate had an approval rating of 48% with a margin of error E of 3%. Construct a confidence interval for the proportion of adults who approve of the candidate.
Use traditional hypothesis test approach. Draw a graph showing the test statistic and critical values. Assume the population has a distribution that is approximately normal and that the sample is a simple random sample.
One group was enquired, questions what they saw. One group was enquired, "About how fast were cars going when they smashed into each other?"
The estimated simple linear regression equation minimizes the sum of the squared deviations between each value of Y and the line.
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