How many tissues should the Kimberly Clark Corporation package of Kleenex contain? Researchers determined that 60 tissues is the mean number of tissues used during a cold.Suppose a random sample of 100 Kleenex users yielded the following data on the number of tissues used during a cold: = 52, S = 22.Suppose the test statistic does fall in the rejection region at α = 0.05.Which of the following decisions is correct? A)At α = 0.05,you do not reject H₀. B)At α = 0.05,you reject H₀. C)At α = 0.10,you do not reject H₀. D)At α = 0.10,you reject H₀.

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We will use a one-tailed t-test with the following hypotheses: H0: μ = 60 (the mean number of tissues used during a cold is 60) Ha: μ < 60 (the mean number of tissues used during a cold is less than 60) The sample size is large (n = 100) and the population standard deviation is unknown, so we will use a t-test. The test statistic is: t = (x̄ - μ) / (s / √n) = (52 - 60) / (22 / √100) = -36 / 22 = -1.64 The degrees of freedom are n - 1 = 99, and the critical t-value for α = 0.05 and a one-tailed test is t = -1.66. Since our calculated t-value (-1.64) falls in the rejection region (t < -1.66), we reject the null hypothesis and conclude that the mean number of tissues used during a cold is less than 60. Therefore, the correct decision is to reject H₀, which is choice B.

How Many Tissues Should the Kimberly Clark Corporation Package of Kleenex