Scientific Questionaire

A study on how grade level affects hours of sleep


Does grade level affect the amount of sleep received per night?


If you are older, then you will be getting more sleep.

Type of Investigation

This is a comparative investigation designed to find out if 10th or 12th graders get more sleep on average.

Parts of the Experiment

Independent Variable- Grade Level

Dependent Variable- Hours of Sleep

Control- None

Constant- None

Experimental Group- None

Data Table-Hours of Sleep Per Grade

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Bar Graphs

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The hypothesis claimed that the hours of sleep a person would receive increases by age, however through the analysis of the data we realized that the hours of sleep received is not significantly impacted by age. Therefore the results are inconclusive, because the data showed that sophomores get more sleep than seniors do, however the error bars overlapped which showed that there was no significant difference. The data shows that sophomores, on average, receive 6.5 hours of sleep and seniors receive 6.1 hours. This means that sophomores receive .4 more hours of sleep than seniors do, which rejects the hypothesis. However after calculating the 2 SEM and drawing the error bars, it was evident that the error bars overlapped, showing that the data had no significant difference and the independent variable didn't have a big effect on the data. Therefore it is unable to tell, from the experiment, whether age really does have an effect on hours of sleep. The data may have been inconclusive because there wasn't a large enough sample size.


In the experiment, the hypothesis was neither correct or incorrect because the data was inconclusive. The purpose of the experiment, which was to design a scientific research question are that would answer a specific research question, was not achieved. Since the results were inconclusive, it is unknown if age really does affect the hours of sleep received.

Sources of Inaccuracies

With the completion of this lab, realization of many errors started appearing. One problem is that the people questioned had to in a way predict or try to recall their information. Some gave their hours of sleep per day from the past year, where they were either freshmen or juniors. Others gave predictions of this upcoming year. Many most likely gave their hours of sleep per day from the first couple weeks of school, which wouldn’t be very accurate since the workload from classes had not completely started.


"Journal of Sleep Research Volume 7, Issue 2, Article First Published Online: 20 APR 2002." A Field Study of Age and Gender Differences in Habitual Adult Sleep. N.p., n.d. Web. 06 Sept. 2015.

Person Sleeping. Digital image. Flickr. N.p., 12 July 2012. Web. 3 Sept. 2015. <>.

Lab Directions