The claim is that the white blood cell counts of adult females are normally? distributed, with a standard deviation equal to 1.6
31.63. a random sample of 38 adult females has white blood cell counts with a mean of 7.43 and a standard deviation of 3.07. find the value of the test statistic.
From the question, we know the population standard deviation, σ = 1.63, the sample standard deviation, s = 3.07, the sample mean, and the sample size, n = 38.
The question illustrates a hypothesis chi-square test of variance.
The test statistics for a Chi-squared test of variance is given by