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A field researcher is gathering data on the trunk diameters of mature pine and spruce trees in a certain area. The following are the results of his random sampling. Can he conclude, at the 0.10 level of significance, that the average trunk diameter of a pine tree is greater than the average diameter of a spruce tree?
Pine trees Spruce trees
Sample size 30 35
Mean trunk diameter (cm) 45 39
Sample variance 120 140
What is the test value for this hypothesis test?
Test value: Round your answer to three decimal places.
What is the critical value?
Critical value: Round your answer to three decimal places.
What would be the appropriate statistical procedure to test the following hypothesis: "Determine the relationship between the year in school (freshman, sophomore, junior and senior) and having a car on campus."
new york city is the most expensive city in the united states for lodging. the mean hotel room rate is 204 per night
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How large sample size must be taken to be 95% confident.
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What decision would an optimist make? Why?
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A survey of top executives revealed that 35 percent of them regularly read Time magazine, 20 percent read Newsweek, and 40 percent read U.S. News and World Report. Ten percent read both Time and U.S. News and World Report.
A normal population has a mean of 60 and a standard deviation of 3. You select a sample of 36. Compute the probability the sample mean is (Round z values to 2 decimal places and final answers to 4 decimal places):
find the z-score for the standard normal distribution wherepzlta
Computing the mean, standard deviation values for the given data - Describe how statistics is being misused in this situation
six students three boys and three girls lineup in a random order for a photograph. what is the probability that the
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