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This question was posted on the America Online Website: Do you believe that the Loch Ness monster exists? Among 21,346 responses, 64% were yes. Use a 0.01 significance level to test the claim that most people believe that the Loch Ness monster exists. How is the conclusion affected by the fact that Internet users who saw the question could decide whether to respond.
Please explain your steps as you work the problem out!
Create a 95% confidence interval for true mean.
Describe the sampling distribution model of this mean.
A teacher divides her class into two groups. One group is taught a lesson on the computer and the other is taught by traditional lecture. The teacher then gives a test to see that group has better grades.
An important idea in data interpretation is choosing which graph to use under which circumstances. Describe the benefits of different graphs for different sets of data:
A random sample of 90 printers discovered that 25 of them were being used in small businesses. Find the 95% limit for the population proportion of printers that are used in small buisnesses.
Indicate at which point flat-of-the-curve medicine is experienced in the following example (imagine that antibiotics have been prescribed for a given population of 1,000 elderly persons).
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Identify the sampling distribution to be used: the standard normal distribution or the Student's t distribution. Find the critical value(s).
From past data, it is recognized that company's production process results in normally distributed yield strengths. Test company's claim at a = 0.05.
She then uses the mean and standard deviation of these values to estimate the mean value for all parts the operator is making. Construct a 95% confidence interval for the mean value assuming a normal distribution.
You read that statistical test at α=0.01 level has probability 0.14 of making a Type II error when specific alternative is true. Calculate the power of test against this alternative?
At 0.01 significance level is it sensible to conclude that modification reduced number of traffic accidents?
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