HPHY212 - Practice Quizzes Exam Questions and Answers Researchers measure the heart rate from 100 students after taking a Human Physiology exam, and find a mean of 120 beats per minute (bpm), with a standard deviation of 20 bpm.Assuming a normal distribution, the middle 95% of the scores
will be between: - Correct Answers ✅80 and 160 bpm
An investigator examined the effect of running on resting heart rate (RHR) by examining two randomly selected groups
- one that ran three times per week for 30 minutes, and one
that did not exercise at all. The mean resting heart rate of the exercise group was 52 beats per minute (bpm), with a standard deviation of 7 bpm. There were 49 subjects in the exercise group. 95% of subjects fell within what resting heart rate range? - Correct Answers ✅38-66 bpm
Confidence intervals represent: - Correct Answers ✅a way
of comparing the sample mean to the population mean A physical therapist records the hip flexion range of motion in 25 patients with hip osteoarthritis. After confirming that the data are normally distributed, she reports a mean of 70 degrees with a standard deviation of 5 degrees. Which range represents 95% of the data for this population? - Correct Answers ✅60 to 80 degrees The height of 25 subjects was collected. The data were normally distributed, with a mean of 175 cm and a standard 1 / 3
HPHY212 - Practice Quizzes Exam Questions and Answers
deviation of 5 cm. The 95% confidence intervals are between:
- Correct Answers ✅173 and 177 cm
What happens to the confidence in a sample mean as the sample size (n) increases? - Correct Answers ✅more confident For a group of normally distributed scores with a mean of 200 and a standard deviation of 10, the middle 99% of the data are between what values? The reliability coefficient for a 99% confidence interval is 2.576. - Correct Answers ✅170 and 230 Adopted from Ottenhigm et al., 2005. Chronic obstructive pulmonary disease (COPD) has been predicted to become the third leading cause of death and the fifth most common cause of disability in the world by 2020. Weakness of the diaphragm (an inspiratory muscle) is the most important cause of death in COPD. Researchers are trying to understand the mechanism explaining this weakness. Muscle fibers were isolated from muscle biopsies from the diaphragm of nine patients with mild to moderate COPD and five patients without COPD. The researchers measured maximum force per cross sectional area, myosin heavy chain content and fraction of strongly-attached cross-bridges, with black boxes represent patients with COPD and white boxes represent patients without COPD(* p < 0.05). 2 / 3
HPHY212 - Practice Quizzes Exam Questions and Answers For the patients with COPD, the mean of their maximum force per cross sectional area (in mN*mm-2) is 200 and the standard deviation is 9. What is the 95 - Correct Answers
✅(194, 206)
The plot below represents the normal distribution of resting heart rate for 100 marathon runners and 100 sprinters.Calculate the 95% confidence interval for both Marathoners and Sprinters. - Correct Answers ✅Marathoners. SEM = SD/sort(n) = 2/10 = 0.2. 95% Confidence interval 59.6 to 60.4 bpm Sprinters. SEM = SD/sort(n) = 5/10 = 0.5. 95% Confidence interval 69 to 71 bpm From a sample of Human Physiology students (n=16), the mean resting heart rate was 68 bpm with a standard deviation of 12 bpm. Assuming a normal distribution, use the empirical rule to calculate the following.What is the 95% confidence interval for the average heart rate of all students in Human Physiology? - Correct Answers ✅(62, 74) HOW TO SOLVE FOR 95% CONFIDENCE INTERVAL GIVEN (n), mean, and SD - Correct Answers ✅SD / sqrt(n) n = sample size, not mean HAHA
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