Reduced heart rate variability (HRV) is known to be a predictor of mortality after a heart attack. One measure of HRV is the average of normal-to-normal beat interval (in milliseconds) for a 24-hour time period. Twenty-two heart attack patients who were dog owners and 80 heart attack patients who did not own a dog participated in a study of the effect of pet ownership on HRV, resulting in the summary statistics shown in the accompanying table. Measure ofHRV (averagenormal-to-normalbeat interval) MeanStandardDeviationOwns Dog874136Does Not Own Dog801133(a) The authors of this paper used a two-sample t test to test H0: ?1 - ?2 = 0 versus Ha: ?1 - ?2 ≠ 0. What assumptions must be reasonable in order for this to be an appropriate method of analysis?We must assume that the population distributions ---Select--- are aren't approximately normal.(b) The paper indicates that the null hypothesis from Part (a) was rejected and reports that the P-value is less than .05. Carry out the two-sample t test. Is your conclusion consistent with that of the paper?YesNo

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Description: Reduced heart rate variability (HRV) is known to be a predictor of mortality after a heart attack. One measure of HRV is the average of normal-to-normal beat interval (in milliseconds) for a 24-hour time period. Twenty-two heart attack patients who w

(a) For the two-sample t test to be an appropriate method of analysis it must be assumed that the…

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MATLAB: An Introduction with Applications

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ISBN:9781119256830

Author:Amos Gilat

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Reduced heart rate variability (HRV) is known to be a predictor of mortality after a heart attack. One measure of HRV is the average of normal-to-normal beat interval (in milliseconds) for a 24-hour time period. Twenty-two heart attack patients who were dog owners and 80 heart attack patients who did not own a dog participated in a study of the effect of pet ownership on HRV, resulting in the summary statistics shown in the accompanying table.

Measure of
HRV (average
normal-to-normal
beat interval)

	Mean	Standard Deviation
Owns Dog	874	136
Does Not Own Dog	801	133

(a) The authors of this paper used a two-sample t test to test H₀: ?₁ - ?₂ = 0 versus H_a: ?₁ - ?₂ ≠ 0. What assumptions must be reasonable in order for this to be an appropriate method of analysis?
We must assume that the population distributions ---Select--- are aren't approximately normal.

(b) The paper indicates that the null hypothesis from Part (a) was rejected and reports that the P-value is less than .05. Carry out the two-sample t test. Is your conclusion consistent with that of the paper?

YesNo

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