The area of a square is calculated by squaring the side length (A = s²). Consequently, 30 = s². Taking the square root gives us s = √30. A calculator shows that √30 is approximately 5.48, or through estimation, we can see that √25 < √30 < √36, suggesting that √30 falls between 5 and 6.
The mean is calculated as 40.25.
(1) The sample mean stands at 1480 hours while the population standard deviation is 80 hours.(2) The null hypothesis posits that the average lifespan of fluorescent bulbs is 1500 hours.(3) The critical value is 1.645.(4) The test statistic is D, -1.58.(5) The conclusion is B, we reject H0.(6) Thus, the conclusion indicates A, there isn't sufficient evidence to substantiate the claim that the average lifespan of its fluorescent bulbs is 1500 hours.
