22. We want to examine the effects of fatigue on mental alertness. Two groups of participants monitored a blank TV screen for 90 minutes and were required to respond each time a dot appeared on the screen. One group was well-rested and the other group had been kept awake for 24 hours prior to the test. The five participants who had been kept awake for 24 hours made an average of M = 35 errors with SS = 120 and the 10 participants in the well-rested group made an average or M = 24 errors with SS = 270. a. Do we have a significant difference in the number of errors made? Test at the a = .05 level of significance.

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22. We want to examine the effects of fatigue on mental alertness. Two groups of
participants monitored a blank TV screen for 90 minutes and were required to respond
each time a dot appeared on the screen. One group was well-rested and the other
group had been kept awake for 24 hours prior to the test. The five participants who had
been kept awake for 24 hours made an average of M = 35 errors with SS = 120 and the
10 participants in the well-rested group made an average or M = 24 errors with SS = 270.
Do we have a significant difference in the number of errors made? Test at the a
= .05 level of significance.
b. Compute estimated d and r?
c. Make a 90% confidence interval estimate of today's population mean level of
anxiety.
d. Write a summary that demonstrates the how the outcome of the hypothesis test
and r? would appear in a research report.
а.
Transcribed Image Text:22. We want to examine the effects of fatigue on mental alertness. Two groups of participants monitored a blank TV screen for 90 minutes and were required to respond each time a dot appeared on the screen. One group was well-rested and the other group had been kept awake for 24 hours prior to the test. The five participants who had been kept awake for 24 hours made an average of M = 35 errors with SS = 120 and the 10 participants in the well-rested group made an average or M = 24 errors with SS = 270. Do we have a significant difference in the number of errors made? Test at the a = .05 level of significance. b. Compute estimated d and r? c. Make a 90% confidence interval estimate of today's population mean level of anxiety. d. Write a summary that demonstrates the how the outcome of the hypothesis test and r? would appear in a research report. а.
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