what formula to i need to calculate the following : In a certain school district, it was observed that 33% of the students in the element schools were classified as only children (no siblings).  However, in the special program for talented and gifted children, 127 out of 311 students are only children.  The school district administrators want to know if the proportion of only children in the special program is significantly different from the proportion for the school district. Test at the α=0.01α=0.01 level of significance.

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