If A={3 -3 4}
{2 -3 4}
{0 -1 1}
,then prove that A^3=A^-1.
plz it's urgent
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a hospital based cross-sectional study, it is planned to estimate the mean D-dimer level among COVID-19 patients. From previous literature, the standard deviation was found to be 200 ng/mL. If the researchers want to estimate the mean with a 50 ng/mL precision and 95% significance level, what is the minimum sample size required?
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bro there is something wrong with the question.
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