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1. For the previous exercise, rather than increase the sample size, what else might you do to increase power? What is a negative consequence of using this strategy?
2. Given the following values for X and s: (a) X = 44, s = 10, (b) X = 43, s = 10, (c) X = 43, s = 2, test the hypothesis H0: µ = 42 with α = .05 and n = 25.
Assume that this average is based on a random sample of 15 test runs of the new lamps and that the sample standard deviation was 18 tons. Give a 90% confidence interval for average annual savings.
You wish to compare how a low-fat diet, low-fat diet and a brisk four-mile walk each day, and a low-fat diet and a four-mile job each day affect cholesterol levels. You randomly assign six subjects to each group. The scores in the table below show th..
jude is interested in buying a digital camera. he visited 9 stores at random and recorded the price of the particular
a pet supplier has a stock at parakeets of which 10 are blue parakeets. a pet store orders 3 parakeets from this
Find the margin of error for the given values of c, s, and n. How many subjects are needed to estimate the number of books read the previous year within one book with 99% confidence?
Construct a frequency distribution of the sample mean, and plot a histogram of this distribution. Use the central limit theorem to calculate and identify the sampling distribution of the sample mean.
question an opportunity sample of 50 undergraduate students was asked to complete a series of personality
a. Plot a histogram for these data. b. What kind of theoretical distribution might you select to represent the distribution of the number of nesting sites? Why? c. Estimate the parameters of the theoretical distribution by calculating the sample mean..
How many ways can she choose 4 dissimilar rides if order does not matter? If she has chosen the first weeks rides, how many ways can she choose four more different rides for second week? Suppose that order does not matter.
The analyst would like to determine a value such that there is a 0.90 probability that the price of the stock will be greater than that value. Find the required value.
A prestigious university requires a score of at least 750 on a graduate exam for admission to its MBA program. Suppose the graduate exam is normally distributed with a mean of 500 and a standard deviation of 200.
the following data were collected for a test of linear correlation and spearmans rank correlation was used2.2 3.3 3.3
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