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Identify the type of error based on rejection of null hypothesis.
In the real world, a given null hypothesis is false; but the collected data lead to the null hypothesis being accepted. That is, the data lead to a failure to reject the null hypothesis.
This situation is known as a(n):
1. Type I error
2. Type II error
3. Not an error
4. None of the above
Find out a 95 percent confidence interval for population mean.
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For each of the following problems, assume that the homogeneity of variance assumption has not been met and that you will need to use the adjusted Welch statistic.
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Create a 95% confidence interval for true mean debt for student borrowers.
Suppose we wish to test the null hypothesis that there are no differences among the proportion of men and women who developed a rash. Evaluate the P-value of the chi-square test of this hypothesis.
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In 1965, a newspaper carried a story about a high school student who reported getting 9207 heads and 8743 tails in 17,950 coin tosses. Is this a significant discrepancy from the null hypothesis H 0 = 1/2.
At the 0.05 significance level, can he conclude that number of absences has declined? calculate approximately the p -value.
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