Q:

You wish to examine whether hot air hand blowers or paper in a medical facility have an effect on the rate of respiratory incidence. You follow 98 health care workers in primary care clinic during flu season. You observe the following incidence of respiratory disease and preferred method of hand drying. 46 workers preferred paper for hand drying, 52 preferred hot air blowers. During the study period 29 of the 98 workers experienced a respiratory illness. OBSERVED VALUES Sick Not Sick Paper 19 27 49 HotAir 10 42 52 29 68 98Your null and alternative hypothesis for the Chi Square test comparing the exposure (air vs paper) and outcome (ill or not ill is Hnull There is no association between the drying choice and ilness Halt There is an association between drying choice and illness a.True b. False

Accepted Solution

A:
Answer:There is an association between drying choice and illness a.TrueStep-by-step explanation:H_0: There is no association between the drying choice and ilness H_a: There is an association between drying choice and illness(Two tailed chi square test)Observations are given as per the following tableObserved     Sick Not sick  Paper 19 27 46 Hot air 10 42 52 29 69 98    Expected row total*col total/grand total      Paper 13.6122449 32.3877551 46 Hot air 15.3877551 36.6122449 52 29 69 98        Chi square =(observed-expected)^2/Expected        Paper 2.132484778 0.896261718 3.028746496 Hot air 1.886428842 0.792846905 2.679275747 4.01891362 1.689108623 5.708022243 Thus chi square = 5.708degrees of freedom = (r-1)(c-1) = 1p value = 0.0167Since p <0.05 our alpha we reject null hypothesisAt 5% significance level, we can sayThere is an association between drying choice and illness a.True