To test H₀: σ = 0.75 versus Hₐ: σ < 0.75, a random sample of size n = 11 is obtained from a population that is known to be normally distributed. If the sample standard deviation is determined to be s = 0.6404, compute the test statistic. If the researcher decides to test this hypothesis at the α = 0.05 level of significance, determine the critical value.