The choices for last blank are: same or not the same Each observation random sam

Question

The choices for last blank are: same or not the same Each observation random sample of 99 bicycle accidents resulting in death was cassified according to the day of the week on which following table. Based on these data, is it reasonable to conclude that the proportion of accidents is not the same for all days of the wee Day of Week Frequency Sunday 14 Monday 13 Tuesday 13 Wednesday 16 Thursday L 15 Friday 16 Saturday 12 p-value interval O p 0.001 O 0.001 s p 0.01 O 0.01 s p k 0.05 O 0.05 S p 0.10 O p 20.10 The proportion of accidents is Seloct for all days.

Explanation / Answer

Nullhypo : All are constant

ALtrernate hypo : All are different

Chi.square (X^2) = Summation of ((observed - expected ) / expected ^2)

= 0.04015

at 0.05 level and degrees of freedom (n-1) = 10 , chi square value = 3.325

The two-tailed P value equals 1.0000

Actual X^2 < critical X^2

Hence Null hypothesis satisfied

DAY frequency exp.freq |(obs-exp)|/exp^2 Sun 14 14 0 mon 13 14 0.005102041 tue 13 14 0.005102041 wed 16 14 0.010204082 thurd 15 14 0.005102041 frid 16 15 0.004444444 sat 12 14 0.010204082 0.04015873

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