An experimental study wad conducted by a researcher to determine if a new time slot has an effect on the performance of pupils in mathematics . Fifteen randomly selected learners participated in the study . Toward the end of the investigation , a standardized asssesment was conducted. The sample mean x= 75 and s=5 . In standardization of the test, the mean was 65 and standard deviation was 8. Based on the evidence at hand, is the new time slot effective ? Use a= 0.05.
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