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1. Why is it useful to know the power of a test?
2. Explain the difference between the p-value and the significance level α.
Find a 95% confidence interval for the true proportion of voters who approve of the way the government is being run.
A California lawyer practices law, on the average, for 30 years. Assuming these members remain steady, how many lawyers would you expect California to have in 2050.
The sample size used was n = 100, and the estimate obtained was 1,287. Can you find the value of the unbiased estimate of the population variance?
an irs auditor randomly selects 5 tax returns from 42 returns of which 15 contain errors. what is the probability that
In a separate drawing, you must also select the correct single number. Find the probability of winning the jackpot.
a coin is tossed repeatedly until either tails appears or heads has appeared four times whichever comes first. find the
How many of these new cardholders would you expect to default? What is the standard deviation?
The area under the standard normal curve between 0 and 2 is twice the area under area between 0 and 1.
If the limits of the confidence interval of the difference between the means of two normally distributed populations were 3.5 and 5.5 at the 95% confidence level, then we can conclude that we are 95% certain that there is a significant difference ..
assume that the significance level is a0.05. use the given information to find the p-value and the critical values.with
Use a 5% level of significance. Make sure to 1. give the null and alternative hypotheses, 2. Calculate the test statistic, and 3. give the conclusion (including a comparison to alpha or the critical value) to receive full credit.
how large a sample is needed to guarantee that the distribution of sample means is approximately normally distributed?
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