A researcher wants to examine the impact of internet use on heart rate. Students

Question

A researcher wants to examine the impact of internet use on heart rate. Students are asked how much they used the internet the hour prior to beginning the study and then grouped into three categories( 31-60 minutes per hour, 1-30 minutes per hour, and no internet use.) The researcher then measured their heartbeat per minute.

Assume a two-tailed test and .05 level of significance. Consider the following results and determine whether to reject or retain the null.

Between Groups

Sum of Squares df Mean Square F Sig.

Between Groups

726.667 2 363.333 4.980 .014 Within Groups 1970.00 27 72.963 Total 2969.667 29

Explanation / Answer

A hypothesis is formulated after identifying the problem which in the above case is the impact of internet use on heart rate. A null hypothesis is first formulated and tested because the researcher wants to disapprove of it. The null hypothesis would be 'there is no significant effect of internet use on heart rate'. The researcher would then test the alternative hypothesis 'the impact of internet use has a significant effect on heart rate' to approve it. The experimenter must statistically first evaluate whether the null hypothesis stands corrected or rejected.

From the above results, the null hypothesis stands rejected because the significance level in the above table shows .014 which is below the .05 level of significance and thus, the alternative hypothesis stands corrected because there is a significant effect of internet use on heart rate.

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