Researchers determine that 60 Puffs tissues is the average number of tissues used during a cold. Suppose a random sample of 100 Puffs users yielded the following data on the number of tissues used during a cold: $\bar { x }$ = 52 and s = 22. Using the sample information provided, the value of the test statistic is: A)t = (52 - 60) / 22 B)t = (52 - 60) / (22 / 100) C)t = (52 - 60) / (22 / 100²) D)t = (52 - 60) / (22 / 10)

Question

Quizplus · Accepted Answer

The test statistic for a sample mean is calculated using the formula $ t = \frac{\bar{x} - \mu}{s/\sqrt{n}} $. Here, $\bar{x} = 52$, $\mu = 60$, $s = 22$, and $n = 100$. Thus, $ t = \frac{52 - 60}{22/\sqrt{100}} = \frac{-8}{22/10} $.

Researchers Determine That 60 Puffs Tissues Is the Average Number xˉ\bar { x }xˉ

Researchers Determine That 60 Puffs Tissues Is the Average Number $\bar { x }$