Students who took a special mathematics preparation course were given a standardized exam. The 95% confidence interval representing the sample's is [ 520.33,575.66 ]. The population mean for the exam is 500 with a standard deviation of 50. What should you conclude? a. There was no effect on the preparation course b. It is not plausible that the sample of students who took the preparation course came from the null hypothesis population of test scores c. The point estimate and the interval estimate are the same d. It is plausible that the sample of students who took the preparation course came from the null hypothesis population of test scores

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