7, the sample size is n = 10, the population variance is σ^2 = 3, and the null hypothesis is H0: µ = 0, we can calculate the test statistic as follows:
\[ t = \frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n}}} = \frac{0.7 - 0}{\sqrt{\frac{3}{10}}} = 1.28 \]
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