Answer:
We conclude that the mean strength is equal to 3400 psi.
Step-by-step explanation:
We are given the following in the question:
Population mean, μ = 3400 psi
Sample mean, = 3450 psi
Sample size, n = 12
Alpha, α = 0.051
Population standard deviation, σ =75 psi
First, we design the null and the alternate hypothesis
We use one-tailed(right) z test to perform this hypothesis.
Formula:
Putting all the values, we have
Now,
Since,
We fail to reject the null hypothesis and accept the null hypothesis. Thus, we conclude that the mean strength is equal to 3400 psi.
The answer is D because distance divided by the number of hours will give velocity
r = 7 feet
C = 2 π r = 14 π
Answer: 14π feet
Not apparently among the choices.
Answer: B. -6
Step-by-step explanation:
Replace all variables. 3(-3+1)
Evaluate expression in parentheses. 3(-2)
Evaluate. 3(-2) = -6