In a study of peegnant women, reseaechers collectod exteasive information on exe

Question

In a study of peegnant women, reseaechers collectod exteasive information on exercise levels of low-risk pregrant working women. A group of 217 women did ne voluntsary or mandstory excrcise during the pregnaney while a group of 238 weesen exercised extensively. Resesechers also recorded the eccurrence of pre- som labor for each wopan The data is swmmarized in the table below -cach cell of the table contains the obscrved count, expecoed couct, and chi-square coatribution: Isbor? Yes 19 No 219 149846 0.005 192 Extensive 0.7005 25 209846 196.0154 0.7683 00823 One would expect women who exrcise extensivcly to expericce pre-torm labor (round youe answer to 4 decimal placcs) This value is . loss than what was coerved in the sample for this group of woen mare than what was observed in the sample foe this group ofwomen. Select the appropriate hypothoses Using the data above, determmine if there is a significant relationship betuween exercising and the occurrence of pre-term labor. Use a significance level of o.oL o Hoi ? crossing and the o euroee of pre-term labor are Dot related Ha: exercising and the oceurrenee of pre-term labor are relased Ho: exorvising and the occumence of pre-term labor are related Ha: exercising and the oocurrence of pre-tern labor are ot related o Seleet the appeoperiste decision rule. Rejeet Ho if probability 001 Rejeot Ho if peobability> 001 ?Using the infermation given in the tablo above, calculate the test statistic (round you.eswer to 4 deemal places). ?- o The prolbability sissecisned with the test stscisties is 0.4435. Based on this, one weuld come to the following decision Reject Ho Fail to rejcet Ho The coaclusion for the test would be the following: At tho 0.01 levol, there is significant ovidance to sonclude excecising and the oosurrone of pro-tem labor are oot rolated At the 0.01 level, there is not significant evidence to cooclude exercising and the oocurence of pre-tern labor are related At the 0.01 level, there is not ?gnificant evidence to conclude exercising and the oorumenee of pre-term labor are not related. At the 0.01 levol, there is significant evidance to sonclude excecising and the oosurronce of pro-tem labor are relaned Points possible: 7 Licerse

Explanation / Answer

as expected frequency =row total*column total/grand total

hence a) one wud expect 23.0154 women to excercise......

less than what we observed.......

2)

Ho:are not related

Ha:are re;lated

3)

reject Ho if probability<0.01

4)

from above chi square test statistic =0.7005+0.075+0.7683+0.0823=1.6261

5)

fail to reject Ho

6)

at the 0.01 level there is not significant,,,,,,,,are related

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