Lesson 4, Quiz Yourself: Answer to #4
Lesson 4:

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Quiz Yourself

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Men do not have more variable heart rate than women, in fact at times 20 and 30, it appears that men may have less variable heart rate (the SE bars are small for men at these times). A close look at the standard error bars in Figure 4 shows that exercise increases heart rate variability. The SE bars are larger during exercise than at rest (time zero).

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