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In the hospital, a sample of 8 weeks was selected, and it was found that the average of 438 patients was treated in emergency room each week. Standard deviation was 16. Determine the 99% confidence interval of true mean. Suppose the variable is normally distributed.
Many newspapers, when reporting results of political polls, say that 'with 95% confidence, the results are in error by no more than ±3 percentage points'.
The lifetime of a light bulb is an Exponential RV with a mean of 800 hours. Let L represent the time (in hours) that one randomly selected light bulb will burn. What is the possibility the light bulb burns for more than 1000 hours.
The width of a confidence interval will be:
If the sales, employment, production, and other business series increase or decrease over a period of time and approximate a straight line, the equation for this growth is given by
Show draw a cause-and-effect diagram to organize the possible causes of delayed flight departures into the following maj categories.
Using classical methods discussed in class, try to estimate the probability of winning.
Find a 95% confidence interval for the proportion p of the inner-city, working-class group who eventually became alcoholics.
The quality-control inspector of a production plant will reject a batch of syringes if two or more defective syringes are found in a random sample of eight syringes taken from the batch. Assume the batch contains 1% defective syringes.
A large bakery buys flour in 25-pound bags. The bakery uses an average of 4,860 bags a year. Preparing an order and receiving a shipment of flour involves a cost of $10 per order. Annual carrying costs are $75 per bag.
What step-by-step methods might make this material easier to learn and internalize? Are the formulas really as terrifying as they might first appear?
What is the appropriate set of hypotheses to test such that a possible outcome of the test would indicate;
Carry out the suitable calculations to test for effect modification. Interpret your results.
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