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You should apply the t.test with the formula interface: t.test(Bwt ~ Sex, data=cats, conf.level=.99). ... <看更多>

Confidence intervals for standardised mean differences. Standardised effect sizes express patterns found in the data in terms of the variability ... ... <看更多>

Or should I interpret the CI as follows: The confidence interval for mean difference in life satisfaction for the two groups is (-35.346,-8.570); as this ... ... <看更多>