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A sample of 20 paired observations generates the following data: = 1.3 and = 2.6. Assume a normal distribution. Use Table 2.
a. Construct the 90% confidence interval for the mean difference μD. (Round all intermediate calculations to at least 4 decimal places and final answers to 2 decimal places.)
b. Using the confidence interval, test whether the mean difference differs from zero.
a. There is evidence that the mean difference differs from zero.
b. There is no evidence that the mean difference differs from zero.
find the following percentiles for the standard normal distribution. interpolate where appropriate. round your answers
Find the value of the interquartile range (IQR).- About what percent of the men gave a response that falls in the interval 155 to 190 pounds?
We studied the loss of vitamin C when bread is stored in Exercise 7.76 (page 470). Recall that two loaves were measured immediately after baking and another two loaves were measured after three days of storage. These are very small sample sizes.
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the shape of the distribution of the time required to get an oil change at a 15 minute oil change facility is unknown.
a researcher placed male rodents in the presence and absence of a conspecific male. cortisol a stress hormone levels
Explain why we need to draw random samples and how such samples are drawn. What are the properties of a (simple) random sample?
Suppose 20% of the people in a city prefer Pepsi-Cola as their soft drink of choice. If a random sample of six people is chosen, the number of Pepsi drinkers.
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A sampling distribution is a distribution of all sample means or sample variances that could be obtained in samples of a given size from the same population.
Assume that a 2005 poll of 1000 American voters found that 76% of Republicans favored ending the tax on dividend income, as did 42% of Democrats and 54% of Independents.
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