Rechargeable Batteries a Researcher Wants to Study the Average Lifetime of Lifetime

Essay

Rechargeable Batteries
A researcher wants to study the average lifetime of a certain brand of rechargeable batteries (in hours).In testing the hypotheses,H₀: μ = 950 hours vs.H₁: μ ≠ 950 hours,a random sample of 25 rechargeable batteries is drawn from a normal population whose standard deviation is 200 hours. ​ ​
-{Rechargeable Batteries Narrative} Recalculate β if n is increased from 25 to 40.