the serious impacts that come from not getting enough, everyone should be tracking their sleep patterns. (4)…

the serious impacts that come from not getting enough, everyone should be tracking their sleep patterns. (4) a good way to track sleep is with wearable fitness trackers. (5) mostly worn around the wrist, these devices track movement, and many also detect heart rate, so they can provide excellent information about sleep patterns. (6) these devices use an accelerometer to detect movement in three directions: forward/backward, up/down, left/right. (7) trackers that measure heart rate can also provide data about how much time asleep is spent in deep sleep as opposed to light sleep. (8) the data these devices provide are not as accurate as the data that come from a sleep lab. (9) polysomnography - a sleep study done in a lab - measures a sleeping persons brain waves, eye and leg movements, breathing, and heart rate to get a precise measure of how much sleep the person gets, including 36 mark for review the writer wants to add a sentence before sentence 8 to introduce the main idea of the third paragraph. which of the following sentences best accomplishes this goal? a it is difficult to say how accurate fitness trackers are when used at home, however, because most research on their effectiveness has been done in laboratory settings. b aside from fitness trackers, there are many other tools for monitoring sleep, including smartphone apps and even devices that attach to bedsheets. c one recent study compared the accuracy of seven different sleep tracking devices. d granted, fitness trackers are not perfect tools.

the serious impacts that come from not getting enough, everyone should be tracking their sleep patterns. (4) a good way to track sleep is with wearable fitness trackers. (5) mostly worn around the wrist, these devices track movement, and many also detect heart rate, so they can provide excellent information about sleep patterns. (6) these devices use an accelerometer to detect movement in three directions: forward/backward, up/down, left/right. (7) trackers that measure heart rate can also provide data about how much time asleep is spent in deep sleep as opposed to light sleep. (8) the data these devices provide are not as accurate as the data that come from a sleep lab. (9) polysomnography - a sleep study done in a lab - measures a sleeping persons brain waves, eye and leg movements, breathing, and heart rate to get a precise measure of how much sleep the person gets, including 36 mark for review the writer wants to add a sentence before sentence 8 to introduce the main idea of the third paragraph. which of the following sentences best accomplishes this goal? a it is difficult to say how accurate fitness trackers are when used at home, however, because most research on their effectiveness has been done in laboratory settings. b aside from fitness trackers, there are many other tools for monitoring sleep, including smartphone apps and even devices that attach to bedsheets. c one recent study compared the accuracy of seven different sleep tracking devices. d granted, fitness trackers are not perfect tools.

Answer

Brief Explanations:

Sentence 8 starts to discuss the inaccuracy of data from fitness - trackers. Option D, "Granted, fitness trackers are not perfect tools", serves as a good lead - in as it acknowledges the limitations of fitness trackers, which is the main idea of the third paragraph. Option A focuses on accuracy in home vs. lab settings, Option B introduces other sleep - monitoring tools, and Option C is about a comparison of different devices, none of which directly introduce the main idea of the third paragraph as well as Option D.

Answer:

D. Granted, fitness trackers are not perfect tools.