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After the pilot study described in Problem2, 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 in table 6-7 are data collected at the end of the study after 6 weeks on the assigned treatment. Generate a 95% confidence interval for the difference in proportions of patients with hypertension between groups.
A clinical trial is planned to compared an experimental mediciation 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 change untreated over time. Systolic blood pressure are mesaured at baseline and again 4 weeks later,
Computed 95% confidence interval for the mean difference in blood pressure over 4 weeks.
Baseline: 120 145 130 160 152 143 126 121 115 135
4 weeks: 122 142 135 158 155 140 130 120 124 130
Entire batch will be rejected if at least one of those tested is defective. Determine the probability that entire batch will be rejected?
what sample size should be used in the funding decision study? Use σ = $4000 as a planning value. ________________
We assume that the population is approximately normally distributed. Find the confidence interval: for a confidence level of 95%:
A pharmaceutical company has developed a screening test for a rare disease that afflicted 2% of the population. Unfortunately, the reliability of this test is only 80%, which means that 20% of the tested will get a false positive.
The fixed monthly cost of operating the production facility is $3000. How many units of part # 2206 have to be sold in a month to break-even?
What is the probability of finding exactly four watch soap operas?
For some positive value of Z, the probability that a standard normal variable is between 0 and Z is 0.3770. Find value of Z? For some value of Z, the probability that a standard normal variable is below Z is 0.2090. Find value of Z?
A sample of 81 account balances of a credit company showed an average balance of $1,200 with a sample standard deviation of $126. You want to determine if the mean of all account balances is significantly different from $1,250. Use a .05 level of ..
The event "the price of stock X has increased and the price of stock Y has not increased" may be written as??
Suppose you, as the manager of Tennessee Grilled Pork. would like to ensure you have enough cleaning staff for your dining room and would like to analyze data for customers who enter the restaurant to place and order and either eat in the restaura..
Create a bell curve chart that shows the number of men needed per day for a 10,000 man hour job. The start date is 1/1/2008 and the end date is 6/1/2008.
For population with mean of µ=60 and a standard deviation of s=24. Determine the z score corresponding to each of following samples.
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