Questions from Essentials of Statistics


Q: In the document “Peak Discharge from Unlogged and Logged Watersheds,”

In the document “Peak Discharge from Unlogged and Logged Watersheds,” J. Jones and G. Grant compiled (paired) data on peak discharge from storms in two watersheds, one unlogged and one logged (100% cl...

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Q: Explain exactly how a paired t-test can be formulated as

Explain exactly how a paired t-test can be formulated as a one mean t-test.

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Q: This exercise shows what can happen when a hypothesis-testing procedure

This exercise shows what can happen when a hypothesis-testing procedure designed for use with independent samples is applied to perform a hypothesis test on a paired sample. The gas mileages, in miles...

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Q: A hypothesis test is to be performed to compare the means of

A hypothesis test is to be performed to compare the means of two populations, using a paired sample. The sample of 15 paired differences contains an outlier but otherwise is roughly bell shaped. Assum...

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Q: Suppose that you want to perform a hypothesis test to compare the

Suppose that you want to perform a hypothesis test to compare the means of two populations, using a paired sample. For each part, decide whether you would use the paired t-test, the paired Wilcoxon si...

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Q: Refer to the vasectomy / prostate cancer study discussed. a

Refer to the vasectomy / prostate cancer study discussed. a. How could the study be modified to make it a designed experiment? b. Comment on the feasibility of the designed experiment that you describ...

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Q: R. Reifen et al. studied various nutritional measures of Ethiopian

R. Reifen et al. studied various nutritional measures of Ethiopian school children and published their findings in the paper “Ethiopian-Born and Native Israeli School Children Have Different Growth Pa...

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Q: Suppose that you want to perform a hypothesis test to compare the

Suppose that you want to perform a hypothesis test to compare the means of two populations, using a paired sample. For each part, decide whether you would use the paired t-test, the paired Wilcoxon si...

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Q: we have presented a confidence interval (CI) for the difference

we have presented a confidence interval (CI) for the difference, μ1 − μ2, between two population means. Interpret each confidence interval. 90% CI is from −10 to −5.

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Q: we have presented a confidence interval (CI) for the difference

we have presented a confidence interval (CI) for the difference, μ1 − μ2, between two population means. Interpret each confidence interval. 90% CI is from 5 to 10.

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