answer every part. dotn forget to mention in part a if it is continuous or discr

Question

answer every part.

dotn forget to mention in part a if it is continuous or discrete

7. Can environmental factors inluence the inci- dence of schizophrenia? A recent project measured the incidence of the disease among children born in a region of eastern China: 192 of 13,748 babies born in the midst of a severe famine in the region in 1960 later devel- oped schizophrenia. This compared with 483 schizophrenics out of 59,088 births in 1956, before the famine, and 695 out of 83,536 births in 1965, after the famine (St. Clair et al. 2005). a. What two variables are compared in this example? b. Are the variables numerical or categorical? If numerical, are they continuous or discrete; if categorical, are they nominal or ordinal? c. Effectively display the findings in a table. What kind of table did you use? d. In each of the three years, calculate the relative frequency (proportion) of children born who later developed schizophrenia. Plot these proportions in a line graph. What pat- tern is revealed?

Explanation / Answer

(a) two variables are- environmental factors, incidence of schizophrenia

(b)  environmental factors is categorical( a categorical variable is a variable that can take on one of a limited, and usually fixed number of possible values,) and it is ordinal because we have to judge before,during and after famine.

incidence of schizophrenia is numerical because we can measure number of patients in numeric quantity.it contain discrete values of the sample proportions.

(c)

year total births   incidence of schizophrenia

1956 59088 483

1960 13748 192

1965 83536 695

(d) 483+192+695=1370

year relative Frequency

1956 483/1370=0.3526

1960 192/1370=0.1401

1965 695/1370=0.5073

in 1960, children later developed  schizophrenia So relative frequency = 0.1401

Proportions

year Proportions

1956 483/59088=0.0082

1960 192/13748=0.014

1965 695/83536=0.0083

So first graph will increase from 1956 to 1960 then graph will decrease from 1960 to 1965

So triangular shape

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