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An endocrinologist is interested in the effects of depression on the thyroid. It is believed that healthy subjects have a mean thyroxin (a hormone related to thyroid function) level of 7.0 micrograms/100 ml and a standard deviation of 1.6 micrograms/100 ml. The endocrinologist wants to assess whether the mean thyroxin level is different for those with depression. She gathers a sample of 35 subjects with depression and obtains a sample mean of 7.82 micrograms/100 ml. What are the null and alternative hypotheses for this study?
If a technical breakthrough occurred that raised the profit per unit of X 1 to $3, would this affect the optimal solution?
Determine the level of measurement for these items related to the newspaper business? The following data gives the weekly amounts spent on groceries for sample of households.
The two cars drove a combined total of 1450 miles, and the sum of their fuel efficiencies was 40 miles per gallon. What were the fuel efficiencies of each of the cars that week?
If researchers want to take a new sample of size 55, what will be the standard deviation of the distribution of the sample mean?
Construct a 95% confidence interval for the difference in the proportions of women and men who have regular exercise programs.
Use 0.01 significance level to test the claim that the selection process is biased against Mexican-Americans. What is the mean and standard deviation for the numbers of Mexican Americans?
Is there reason to believe there is a positive linear correlation between the number of t.v. commercials and the sale of this product?
Prepare a mixed integer programming model for this problem.
Which two types of probability sampling are best suited for business research and statistical data analysis, and why?
Given that this sample is extremely large, can the responses be considered to be representative of the population of the United States? Explain.
Standard deviation of 12 ounces. Find the probability of randomly selecting a newborn child whose weight is less than 107 ounces.
The team wins 50 percent of their night games and 90 percent of their day games. According to today's newspaper, they won yesterday. What is the probability the game was played at night?
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