Laughter Is Often Called The Best Medicine Since Studies Have Shown That Laughter Can Reduce Muscle Tension And Increas 1 (60.06 KiB) Viewed 23 times
Laughter Is Often Called The Best Medicine Since Studies Have Shown That Laughter Can Reduce Muscle Tension And Increas 2 (33.1 KiB) Viewed 23 times
Laughter is often called the best medicine" since studies have shown that laughter can reduce muscle tension and increase oxygenation of the blood. A group of researchers decide to perform a hypothesis test to determine if (on average) laughter is associated with an increase in heart rate. It is known that the mean resting heart rate of adults is 70 beats per minute (bpm) The researchers gather a sample of 100 subjects aged 18-34 years and measure their heart rates during laughing periods (induced by a funny film clip). The mean and standard deviation of subject heart rates during laughter were 72.2 bpm and 8 bpm, respectively. Perform a z-test to determine if there is evidence to support the claim that the laughter is associated with an increase in heart rate. Use the following steps ( a = 0.05). Let Il denote the mean heart rate (in bpm) of laughing adults. 1. Select from the list below, the appropriate null and alternative hypotheses. A) H: 4 > 70; H: 4 = 70 e ) B) Hoiul = 70; H:u < 70 c) Horn = 70; H: 48 70 D) Ho:u= 70; Hu70 2. Calculate the z-statistic. (to 2 decimal places) ZE
2. Calculate the 2-statistic. ZE (to 2 decimal places) 3. Determine the p-value. (to 4 decimal places) pa 4. State your decision. Since the p-value is than a =0.05, we • reject Ho: 5. Select the correct conclusion, 6. Calculate the effect size (Cohen's d), and classify it as either small, medium or large. d = (to 3 decimal places), which is a effect
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