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A researcher fails to find a significant different in mean blood pressure in 36 matched pairs. The standard deviation of the difference was 5 mmHg. What was the power of the test to find a mean difference of 2.5 mmHg at α = 0.05 (two-sided)?
the irs reported that 62 of individual tax returns were filed electronically in 2008. a random sample of 225 tax
Vineyards. The histogram shows the sizes (in acres) of 36 vineyards in the Finger Lakes region of New York.
Consider tossing a pair of fair dice two times. For each of the following pairs of events, tell whether they are disjoint, independent, or neither.
In a simple random sample of 30 days, what is the probability that the mean number of daily emergency admissions is between 75 and 95?
The probability that the daily demand at this store is at least one and at most three is:
1. What are the null and alternative hypotheses? 2. What is the value of the test statistic you will use to check the hypothesis?
Experience ranges from 0 to 3. University ranking ranges from 1 to 4 (with 1 being the highest rank), and the Wonderlic test ranges from 0 to 50.
In fitting a least squares line to n=15 data points, the following quantities were computed: SSxx=55, SSyy=198, SSxy=-88, x-bar=1.3, and y-bar=35.
Based on this sample, can you conclude that the machine needs an adjustment? Explain. Assume that the population distribution is normal.
Let H0 and H1 be simple and let a ? (0, 1). Suppose that T* is a UMP test of size a for testing H0 versus H1 and that ß
In his book Natural Inheritance, p. 63, F. Galton in 1889 described an apparatus known today as Galton's quincunx.
Find the 90% confidence interval estimate of the population mean. Interpret the interval estimate. 79 43 58 66 101 63 79 33 58 71 60 101 74 55 88.
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