STEP ONE: STEP TWO: STEP THREE: STEP FOUR: STEP FIVE: STEP SIX: Test Statistic: Critical Value(s):

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8. A study of seat belt use involved children who were hospitalized after motor vehicle crashes. For a group
of 123 children who were wearing seat belts, the number of days in intensive care units (ICU) has a mean of
0.83 days and a standard deviation of 1.77 days. For a group of 290 children who were not wearing
seatbelts, the number of days spent in ICUS has a mean of 1.39 days and a standard deviation of 3.06 days.
Use 0.05 significance level to test the claim that children wearing seat belts have a lower mean length of time
in an ICU than the mean for children not wearing seat belts. What important conclusion do the results
suggest?
STEP ONE:
STEP TWO:
STEP THREE:
STEP FOUR:
STEP FIVE:
STEP SIX:
Test Statistic:
Critical Value(s):
STEP SEVEN:
Transcribed Image Text:8. A study of seat belt use involved children who were hospitalized after motor vehicle crashes. For a group of 123 children who were wearing seat belts, the number of days in intensive care units (ICU) has a mean of 0.83 days and a standard deviation of 1.77 days. For a group of 290 children who were not wearing seatbelts, the number of days spent in ICUS has a mean of 1.39 days and a standard deviation of 3.06 days. Use 0.05 significance level to test the claim that children wearing seat belts have a lower mean length of time in an ICU than the mean for children not wearing seat belts. What important conclusion do the results suggest? STEP ONE: STEP TWO: STEP THREE: STEP FOUR: STEP FIVE: STEP SIX: Test Statistic: Critical Value(s): STEP SEVEN:
Expert Solution
Given

n1 = 123

n2 = 290

 

x1 = 0.83

x2 =1.39

 

s1 = 1.77
s2 =3.06

 

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