Reference no: EM13946147
1. A study is run to estimate the mean total cholesterol level in children 2-6 years of age. A sample of 9 participants is selected and their total cholesterol levels are measured as follows. 185 225 240 196 175 180 194 147 223 Generate a 95% confidence interval for the true mean total cholesterol levels in adults with a history of hypertension.
2. A clinical trial is planned to compare an experimental medication designed to lower blood pressure to a placebo. Before starting the trial, a pilot study is conducted involving 10 participants. The objective of the study is to assess how systolic blood pressure changes over time untreated. Systolic blood pressures are measured at baseline and again 4 weeks later. Compute a 95% confidence interval for the difference in blood pressures over 4 weeks.
3. After the pilot study (described in #2), the main trial is conducted and involves a total of 200 patients. Patients are enrolled and randomized to receive either the experimental medication or the placebo. The data shown below are data collected at the end of the study after 6 weeks on the assigned treatment. Experimental (n=100) Placebo (n=100) % Hypertensive 14% 22% Generate a 95% confidence interval for the difference in proportions of patients with hypertension between groups.
4. The following data were collected as part of a study of coffee consumption among male and female undergraduate students. The following reflect cups per day consumed: Generate a 95% confidence interval for the difference in mean numbers of cups of coffee consumed between men and women.
5. A clinical trial is conducted comparing a new pain reliever for arthritis to a placebo. Participants are randomly assigned to receive the new treatment or a placebo. The outcome is pain relief within 30 minutes. The data are shown below. Pain Relief No Pain Relief New Medication 44 76 Placebo 21 99.
a. Generate a 95% confidence interval for the proportion of patients on the new medication who report pain relief.
b. Generate a 95% confidence interval for the difference in proportions of patients who report pain relief.
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Maximum velocity in the boundary layer
: (a) Estimate the boundary layer thickness at a location 0.25 m measured from the lower edge. (b) What is the maximum velocity in the boundary layer at this location and at what position in the boundary layer does the maximum occur?
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Dicsuss a business scenario that might have use bitmap index
: Discuss a business scenario that might have use for a bitmap index?
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Explain the concept of the total cost of ownership
: Explain the concept of the total cost of ownership. Summarize the different types of information service outsourcing. Explain the benefits and risks associated with information service outsourcing.
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Determine the gure of meritdescribed
: In many cases, we are concerned with free convection involving gases that are contained within sealed enclo- sures. Consider air at 27°C and pressures of 1, 10, and 100 bars. Determine the gure of meritdescribed in Problem 9.4 for each of these thr..
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Find 95% confidence interval difference in blood pressures
: The following data were collected as part of a study of coffee consumption among male and female undergraduate students. The following reflect cups per day consumed: Generate a 95% confidence interval for the difference in mean numbers of cups of ..
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Aggressive working capital policy
: Aggressive working capital policy, may increase the entity's return, but it also increases the risk. - -Net Income Problem: A firm has the following accounts: Net patient revenue = $1,500,000 Supply expense = $200,000 Depreciation expense = $100,..
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Discuss the future of information services outsourcing
: Discuss the future of information services outsourcing. Write an essay on e-mail management. Produce a business case clearly presenting the arguments for and against off- shore outsourcing.
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Is the system a client/server system
: What are the advantages and disadvantages of the system.
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Calculate the volumetric thermal expansion
: Using the values of density for water in Table A.6, calculate the volumetric thermal expansion coefficient at 300 K from its definition, Equation 9.4, and compare your result with the tabulated value.
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