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Consider that the population is normally distributed construct a 95% confidence interval estimate for the population mean for each of the subsequent samples:
Sample A: 1 1 1 1 8 8 8 8
Sample B: 1 2 3 4 5 6 7 8
Describe why these two samples produce different confidence intervals even though they have the same mean and range.
In studying the performance of the comapany's stock investments over the past year, the research manager of a mutual fund company finds that only 43% of the stocks returned more than the rate that had been expected at the beginning of the year.
Which salesperson should be assigned to each region to minimize total time? Identify the optimal assignments and compute total minimum time.
The company has evidence that its line produces %0.9 of noncorforming items. What is the probability that an item selected for inspection is classified as defective?
A sample of 70 orders revealed that 57 were delivered in promised time. At .02 significance level, can we conclude that less than 87 percent of orders are delivered in less than 10 minutes?
Is the Euro fair? Soon after the Euro was introduced as currency in Europe, it was widely reported that someone had spun a Euro coin 250 times and gotten heads 140 times. We wish to test a hypothesis about the fairness of spinning the coin.
Using this information, calculate Blpha risk (probability of Type II error) if the true population mean really is 79.
"Suppose that we conducted a survey in which we asked 800 people the following question: "In the event of an emergency, would you seek medical assistance at the emergency room of our hospital?"
Psychologists once measured 77 variables on a sample of schizophrenic people and a sample of people who were not schizophrenic. They compared the two samples using 77 separate significance tests.
Compute the difference in traffic counts on the 6th and the 13th. Can you conclude that people tend to stay home more on Friday the 13th?
You are given an annual time series with 40 consecutive values and asked to fit a fifth-order autoregressive model.
There were 3 defectives in the first batch and 5 in the second. Find a 95% confidence interval using the plus four method for the difference in the proportion of defectives.
Conduct a one-tailed hypothesis test given the information below. A certain brand of Green Energy light bulbs was advertised as having an average illumination life-span of 2,500 hours.
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