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The development of new drugs has to undergo stringent regulations resulting in long lead times and high research and development costs. Suppose that you are in charge of the federal agency that grants drug approvals and you wish to be convinced that a new drug is better than an existing one in terms of increasing the average life of patients.(a) What are appropriate null and alternative hypotheses?
(b) Explain what type I and II errors are in this context and discuss their relative seriousness.
(c) How might you reduce the chances of these errors?
(d) What assumptions do you need to make to test the hypothesis in part (a)? How would you test the assumptions? Note that distributional assumptions will be tested.
1. What was the difficult decision facing George Washington in 1787? 2. What political events brought about Washington's decision? 3. What were his main reasons for not attending the Constitutional Convention in Philadelphia?
The vessel where the second reaction will take place. The times for the two reactions are independent. Find the standard deviation of the time required to complete the process.
a 2012 gallup poll surveyed americans about their employment status and whether or not they have diabetes. the survey
Explain why an observed value of 250 hours is not unusual for an individual light bulb, even though it is outside the confidence interval you calculated.
two students jen and john are registered for the same class and attend independently to each other jen 96 of the time
in 2010 91 of households had at least one cell phone. a random sample of 300 households in each of two different
An election poll reported that a candidate had an approval rating of 34% with a margin of error E of 2%. Construct a confidence interval for the proportion of adults who approve of the candidate.
Hits on a personal web site occur quite infrequently. They occur randomly and independently with an average of five per week.
Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. Round to three decimal places. n=74, x=12; 95% confidence.
If we define event R as the event that a randomly chosen person was exposed to a radio advertisement and event T as the event that the person was exposed to a television commercial, define R T and R T in this context.
- in an emergency room at a hospital on average 4.5 patients that are seen on any given day are admitted to the
Compute a two-sided 90% confidence Interval estimate for µd.
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