13. 30-35 psi. My source is
. This site teaches you where to look for tire pressure and how to
tire psi. This site also teaches you how to maintain a good tire psi.
One good study that can be conducted to accurately record heart rate in a
general population is to randomly select individuals from different age
intervals to record their average heart rate. First, from a population we
should segregate everyone's ages into an interval of 5 ages, starting from 18.
(ex. 18-23. 24-29. 30-35. 36-41. 42-47. 48-52. 53-58. 59-64. 65-70 [9 age
intervals]. From this, randomly select 100 individuals to participate in the
study (within that age interval) and record their average heart rate over a day.
This can be done by recording one's heart rate every hour and averaging the
values (there should be 24 values since there are 24 hours in a day). After this,
find the mean of all of the 100 individuals' average heart rate in that age
interval and record it in a table. Repeat this with all 9 age intervals. Lastly,
chart down all of the data on a table and graph the result to compare and
determine how heart rate varies in the general population with age.
15. The independent variable would be the age interval while the dependent
variable would be the average heart rate
16. When you have the results, you should plot the age interval on the x axis ((ex.
18-23. 24-29. 20-35. 36-41. 42-47. 47-52. 53-58. 59-64. 65-70) and the average
heart rate on the y axis.