Question

In the results section the authors wrote “Gender had no effect on any of the studied parameters; however, the electrocardiographic events of lambs exhibited age-related changes (P < 0.05).” If there was a hypothesis about gender, would the null hypothesis or the alternate hypothesis be accepted? (1 point)

How do you know that your answer to question 1 is correct? (1 point)

In the results section the authors wrote “Gender had no effect on any of the studied parameters; however, the electrocardiographic events of lambs exhibited age-related changes (P < 0.05).” If there was a hypothesis about age, would the null hypothesis or the alternate hypothesis be accepted? (1 point)

How do you know that your answer to question 1 is correct? (1 point)

In the results section the authors wrote “During the first 24 h after birth, the median heart rate was 91.955 +/- 42.176 beats per minute (range: 290-121 bpm). During the first two postnatal weeks, the median heart rate increased to 214.955 +/- 54.582 bpm (range: 305-122 bpm) and 195.5 +/- 37.744 bpm (range: 260-108 bpm), respectively.” Is this a positive correlation, a negative correlation, or no correlation? (1 point)

How do you know that your answer to question is correct? (1 point)

In the results section the authors wrote “When a gradual increase in RR interval was observed a parallel decrease in HR was also documented.” Is this a positive correlation, a negative correlation, or no correlation? (1 point)

How do you know that your answer to question 7 is correct? (1 point)

In the discussion section the authors wrote “The allometric relationship between size and/or body weight and heart rate have been described during years as inversely proportional between the various domestic species, this relation is higher in species like small rodents (500 -700 bpm) and smaller in whales (20 bpm).” What kind of correlation exists (positive, negative, or none) for small rodents and their heart rate and whales and their heart rate? (1 point)

How do you know that your answer to question 9 is correct? (1 point)

Why is the heart rate small rodents high and why is the heart rate of whales low? (1 point)

Reference: https://bmcphysiol.biomedcentral.com/articles/10.1186/s12899-016-0020-5

Answer 1

1. The p-value associated with the parameter ( P< 0.05), we will reject the null hypothesis and accept the alternative hypothesis.

2. The p-value associated with the parameter ( P< 0.05), we will reject the null hypothesis and accept the alternative hypothesis.

3. There is no correlation between the median heart rate after 24 hr of birth and heart rate during the first two postnatal weeks.

4. This is a case of negative correlation. Since the increase of RR interval simultaneously there was a reduction in HR interval.

5. In both the cases, the size or body weight of an organism is inversely proportional to the heart rate. Hence, clearly, it is a case of negative correlation.