A manufacturer of hard safety hats for construction workers is concerned about the mean and the variation of the forces helmets transmit to wearers when subjected to a standard external force. The manufacturer desires the mean force transmitted by helmets to be 800 pounds for tess). well under the 1000-pound legal limit and the standard deviation to be less than 40. A random sample of 31 helmets was tested and the sample mean and variance were found to be 825 pounds and 2350 pounds, respectively. The manufacturer wants to know if the data provides sufficient evidence to indicate that the standard deviation exceeds 40. Step 1 of 5: Calculate the test statistic for this problem, Round your answer to two decimal places, Answer Point HD Tables Keypad Keyboard Shortcuts 1600 lbs Answer Point Tables IR Keypad Keyboard Shortcuts D-value 0.975 Tev 0,025 p value 0.05 0.05 p value -0,1 value=0.0005 None of the above A manufacturer of hard safety hats for construction workers is concerned about the mean and the variation of the forces helmets transmit to wearers when subjected to a standard external force. The manufacturer desires the mean force transmitted by helmets to be 800 pounds for less, well under the 1000-pound legal limit, and the standard deviation to be less than 40. A random sample of 31 helmets was tested and the sample mean and variance were found to be 825 pounds and 2350 pounds, respectively. The manufacturer wants to know if the data provides sufficient evidence to indicate that the standard deviation exceeds do Step 3 of 5: What is the rejection region at the 10% level of significance for the test on the variance for a right-talled alternative hypothesis? The alternative hypothesis for this problem is Hino 1600 lbs. Answer Point Tables I Keypad Keyboard Shortcuts Reject H > 20.599 1600lbs. Answer Point Tables I keypad Keyboard Shortcu We are 95% confident that the true mean force equals 800 pounds, AL C0.05, we reject the null hypothesis and conclude that there is sufficient evidence to conclude the true variance exceeds 1600 pounds ev At a = 0.05, there is insufficient evidence to conclude the true variance exceeds 40 pounds We are 95% confident that the helmets meet the requirements None of the above A manufacturer of hard safety hats for construction workers is concerned about the mean and the variation of the forces helmets transmit to wearers when subjected to a standard external force. The manufacturer desires the mean force transmitted by helmets to be 800 pounds (or less well under the 1000-pound legal limit, and the standard deviation to be less than do. A random sample of 31 helmets was tested and the sample mean and variance, were found to be 825 pounds and 2350 pounds respectively. The manufacturer wants to know if the data provides sufficient evidence to indicate that the standard deviation exceeds 40 Step 5 of 5: Calculate a 99% confidence interval for the variance of force on the helmets. Round your answers to four decimal places. Answer Point Im Keypad Keyboard Shortcuts From
