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9. [5/10 Points] DETAILS An article gave the following observations on maximum concrete pressure (kN/m²). 33.3 41.9 37.4 40.3 36.7 39.2 36.3 41.9 36.0 35.3 36.8 38.9 35.9 35.3 40.2 PREVIOUS ANSWERS DEVORESTAT9 7.4.046. (a) Is it plausible that this sample was selected from a normal population distribution? Using a normal probability plot, we ascertain that it is plausible that this sample was taken from a normal population distribution. O Using a normal probability plot, we ascertain that it is not plausible that this sample was taken from a normal population distribution. Because of the number of observations, we ascertain that it is plausible that this sample was taken from a normal population distribution. O Because of the number of observations, we ascertain that it is not plausible that this sample was taken from a normal population distribution. You may need to use the appropriate table in the Appendix of Tables to answer this question. Need Help? Read It (b) Calculate an upper confidence bound with confidence level 95% for the population standard deviation of maximum pressure. (Round your answer to three decimal places.) 3.673 X Submit Answer MY NOTES Watch It ASK YOUR TEACHER PRACTICE ANOTHER