Question: Seven sixth-grade children were randomly selected to participate in a teaching experiment. At the end of the experiment, the children completed a test to assess sixth-grade school achievement which has been standardised to have a mean μ = 300. The resulting achievement test scores are:

386 311 374 316 303 298 387

Showing all workings, determine whether the data provides sufficient evidence of a change in the average test scores of the participants? Test at the 5% level of significance using a two tailed test.

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