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Gathering data using a variety of techniques like sampling, experiment, simulation or census. What technique for gathering data (sampling, experiment, simulation or census) do you think was used in each of the following studies?
1. A computer program was used to model global weather patterns and to produce long-range weather forecasts for a rural agricultural region.
2. A random sample of 1,000 residents of a main metropolitan area was surveyed to determine the level of support for a new sports complex between all residents of area.
3. To conclude the effect of a new fertilizer on productivity of tomato plants one group of plants is treated with the new fertilizer as a second group is grown without such treatment. The number of ripe tomatoes produced by each group is counted.
4. A study was done regarding the number of home runs scored by major league baseball teams playing at altitudes over 5,000 feet. Data for all main league baseball games played at his altitude was used in the study.
Calculate descriptive statistics for each stock and the S&P 500. Comment on your results. Which stocks are the most volatile? Calculate the value of beta for each stock.
First explain what the Gini coefficient is and what hypothetical Gini values of 0 and 1 mean. Sort the data by the Gini coefficient in 2000 and look at the list of countries.
Use this information to make a 95% confidence interval to evaluate true average number of copies made each day at this company.
Show that someone will think that the claim has more than a fifty percent chance of being true if p > q / (1 + q). Explain.
What should the cut-off score be for the interviews? (Round to nearest whole number).
Randomly select a sample of five rental agencies. Start with row two and column two. The number is 90935. Use the first two numbers starting with 90.
To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments. You are given the results below.
The average age of the students in the sample was 23 with a standard deviation of 3.5: a) Formulate the hypotheses for this problem.
Using quadratic regression model find the estimated number of planes.
Create a 99% confidence interval for mean overall duration of symptoms in population of individuals who used zinc lozenges.
For the 20 test scores shown, find the percentile rank for a score of 86.
Why is cumulative relative frequency distribution so much more informative that just relative frequency distribution? Use examples to explain these differences.
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