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A sample of difference scores from a repeated-measures experiment has a mean of MD ! 4 with a standard deviation of s ! 6.
a. If n ! 4, is this sample sufficient to reject the null hypothesis using a two-tailed test with &!.05?
b. Would you reject H0 if n ! 16? Again, assume a two-tailed test with &!.05.
c. Explain how the size of the sample influences the likelihood of finding a significant mean difference.
More on the reading comprehension study. In the study described in the previous exercise, Basal is the traditional method of teaching.
Suppose two dice are rolled. If o is an outcome, and the two dice show different numbers, let X(o) be the quotient of the larger number divided by the smaller.
What is the probability that a randomly selected purchaser bought a basic model and chose not to buy a warranty?
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A real estate agent in the coastal area of Georgia wants to compare the variation in the selling price of homes on the oceanfront with those one to three blocks from the ocean sample of 21 oceanfront homes sold within the last year revealed the st..
An oil company can only afford to drill at eight sites, sequentially chosen. How many possibilities are there, in order of selection?
A psychologist measures units of change for a memory test after students are given an opportunity to sleep only four hours. The following change units were obtained: 7, -12, 4, -7, 3, -10. Find the a) mean, b) median, c) mode, d) standard deviatio..
Consider the rolling of 2 six-sided fair dice, find the conditional probability P(first dice =3 | sum of two dice = 7). Are these two events independent?
(a) Identify the null hypothesis and alternative hypothesis. (b) Determine the test statistic. (c) Determine the P-value for this test. (d) Is there sufficient evidence to support the researcher's claim? Explain.
a tube of listerine tartar control toothpaste contains 4.2 ounces. as people use the toothpaste the amount remaining in
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a) What type of data-collection method was used? b) What variable, quantitative or qualitative, is measured?
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