Answer:
A two-sample t-test for a difference between sample means
Step-by-step explanation:
Explanation:-
A random sample of 50 bags from each of Brand X and Brand Y was selected
Given two sample sizes n₁ and n₂
Each bag was held from its rim, and one-ounce weights were dropped into the bag one at a time from the same height until the bag ripped
mean of ounces the first sample = x⁻
mean of the second sample =y⁻
Given data one-ounce weights were dropped into the bag one at a time from the same height until the bag ripped
Standard deviation of the first sample = S₁
Standard deviation of the second sample = S₂
Now we use t - distribution for a difference between the means
[tex]t = \frac{x^{-} -y^{-} }{\sqrt{S^{2}(\frac{1}{n_{1} } +\frac{1}{n_{2} } } }[/tex]
where
[tex]S^{2} = \frac{n_{1} S_{1} ^{2} +n_{2}S_{2} ^{2} }{n_{1} +n_{2} -2 }[/tex]
Degrees of freedom γ = n₁ +n₂ -2
Answer:
B
Step-by-step explanation:
A: it's not matched-pairs because they're independent, not a before-and-after thing
C: it's not population proportions, it's means
D: sample means is population means (B), so it's not a thing
E: it's two samples, not one sample
