Question

LBW
		No	Yes	total
Race	White	76	20	96
	Black	14	12	26
	Other	43	24	67

Referring again to the table above of LBW by Race, we want to know if the proportion of LBW births to black women is significantly different from the proportion of LBW births to women of race “other”, based on an α=0.05 test.

1. Is this question calling for a 2-sided test? (yes or no) [a]
2. What is the test statistic, based on the normal distribution approximated standard error? [b]
   (Report with 2 decimal places, such as 1.23.  Hint: this is calculated according to slide 15 in the lecture. Do not do heavy rounding your results until the last calculation, e.g., leave at least 3 decimal places in your intermittent calculations. )
3. Does this Z-statistic indicate the two proportions are significantly different from each other, based on no more than a 5% chance of a type 1 error (alpha = 0.05)? (yes or no) [c]

Answer 1