- Screen time and use of social media are related to negative mental health outcomes, including suicidal thoughts (Twenge, Joiner, Rogers, & Martin, 2018). In a national survey of adolescents, the mean number of depressive symptoms was u = 2.06, o = 1.00. Suppose that a researcher recruits n=25 participants and instructs them to visit friends or family instead of using social media. The researcher observes that the average number of depressive symptoms is M = 1.66 after the intervention. a. Test the hypothesis that the treatment reduced the number of depressive symptoms. Use a one-tailed test with a = .05. b. If the researcher wants to reduce the likelihood of a Type 1 error, what should they do?

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18. Screen time and use of social media are related to
negative mental health outcomes, including suicidal
thoughts (Twenge, Joiner, Rogers, & Martin, 2018).
In a national survey of adolescents, the mean number
of depressive symptoms was u = 2.06, o = 1.00.
Suppose that a researcher recruits n = 25 participants
and instructs them to visit friends or family instead of
using social media. The researcher observes that the
average number of depressive symptoms is M = 1.66
after the intervention.
a. Test the hypothesis that the treatment reduced the
number of depressive symptoms. Use a one-tailed
test with a = .05.
b. If the researcher wants to reduce the likelihood of a
Type 1 error, what should they do?
Transcribed Image Text:18. Screen time and use of social media are related to negative mental health outcomes, including suicidal thoughts (Twenge, Joiner, Rogers, & Martin, 2018). In a national survey of adolescents, the mean number of depressive symptoms was u = 2.06, o = 1.00. Suppose that a researcher recruits n = 25 participants and instructs them to visit friends or family instead of using social media. The researcher observes that the average number of depressive symptoms is M = 1.66 after the intervention. a. Test the hypothesis that the treatment reduced the number of depressive symptoms. Use a one-tailed test with a = .05. b. If the researcher wants to reduce the likelihood of a Type 1 error, what should they do?
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