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(a) Explain clearly what is meant by a false negative rate of 5% and a false positive rate of 15%. (b) If the population were screened, what proportion would be expected to test negative for metropathy? (c) What proportion of those testing negative actually have the disease? (d) Explain clearly in words why this proportion is so surprisingly small.
What proportion of sample means would be between 1.31 and 1.33 inches?
What percentage of the variation in their scores on the second round can be explained by their scores on the first round?
Find a 99% confidence interval for the difference in the mean number of calls between night and day.
Convert each of the following z intervals to x intervals.
Using the original data, estimate the population standard deviation with 90% probability.
Use the trend equation to calculate the points for 2003 and 2005. Plot them on the graph and draw the regression line.
Finds the average life time for this sample is 970 hour and the standard deviation is 80 hours. Can the firm claim that the average life time is 1000 hours at the 5% level of significance?
Three times each year, the procurement manager at Phoenix contacts National\'s marketing department to place a monthly order for each of the coming four months.
At 0.05 level of significance, is there evidence of significant relationship between age group and where people mainly get their news? If so, describe the relationship.
Discuss an example where you would use a test of hypothesis for in your professional life, personal life, education or politics. Provide sufficient details so that the context is clear and also discuss if the example involves:
How many students would be required to estimate the proportion of students who consume coffee? Suppose we want the estimate to be within 5% of the true proportion with 95% confidence.
Triathalon Times Jeff Parent is a statistics instructor who participates in triathalons. Listed below are times (in minutes and seconds) he recorded as riding a bicycle for five laps through each mile of a 3-mile loop.
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