Pooled Proportion Calculation Error
A researcher performs a significance test for the difference between two proportions using the data in the table. An error is made when calculating the pooled proportion, . Which of the following statements describes a plausible error in the calculation?
TABLE: Two-Sample Data for Pooled Proportion
| Group | Successes | Sample Size |
|---|---|---|
| Group 1 | 84 | 125 |
| Group 2 | 72 | 150 |
A
She should not have pooled the proportions since the samples are independent.
B
She incorrectly set the significance level, affecting the pooled standard error calculation.
C
She misapplied the normal approximation due to a small sample size.
D
She incorrectly computed the pooled proportion, leading to an erroneous standard error.
E
She confused the pooled proportion with the individual sample proportions.
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