Suppose that 2 students count Daphnia heartbeats multiple times, resulting in an average heartbeat of... Student A 196.7 $\pm$.05 BPM Student B 200 $\pm$ 2 BPM The more precise work was done by Student A because that student's data has a smaller standard deviation.
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Express all $z$ scores with two decimal places. 8. Student's Pulse Rate A male student of the author has a measured pulse rate of 52 beats per minute. Based on Data Set 1 in Appendix $B$, males have a mean pulse rate of 67.3 beats per minute and a standard deviation of 10.3 beats per minute. a. What is the difference between the student's pulse rate and the mean pulse rate of males? b. How many standard deviations is that (the difference found in part (a))? c. Convert the student's pulse rate to a $z$ score. d. If we consider "usual" pulse rates to be those that convert to $z$ scores between -2 and 2 , is the student's pulse rate usual or unusual?
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The Excel file STATISTICSSTUDENTSSURVEYFORR contains the column BEFPULSEMIN (a numerical variable that measures student pulses before completing an online survey). For education purposes, consider this dataset to be a sample of size 60 taken from a much larger normal population for statistics students. You wish to determine whether the average beats per minute for the population differs from 76 beats per minute. Use R to create a 99% confidence interval to help you choose the correct statement below. a. The sample mean is 76 beats per minute, and the test is not significant at the 1% significance level because 76 beats per minute is inside the confidence interval you created. b. The sample mean is 74.4 beats per minute, and the test is significant at the 1% significance level because 74.4 beats per minute is inside the confidence interval you created. c. The sample mean is 74.4 beats per minute, and the test is not significant at the 1% significance level because 76 beats per minute is inside the confidence interval you created. d. The sample mean is 74.4 beats per minute, and the test is significant at the 1% significance level because 76 beats per minute is inside the confidence interval you created.
Jerelyn N.
12. Consider the Body Data. Females have pulse rates that are normally distributed with a mean of 74.0 beats per minute and a standard deviation of 12.5 beats per minute. a) Find the probability of a pulse rate less than 100 beats per minute. b) Find the probability of a pulse rate greater than 80 beats per minute. c) Find the probability of a pulse rate between 60 beats per minute and 70 beats per minute. d) Find the pulse rate separating the bottom 90% from the top 10%. e) Find the pulse rate separating the bottom 25% from the top 75%.
Ahmet Y.
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