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.edu.au woblem/do test on teatatime.com # # e Learn // MATI12124_2050 (MATH 2124 2050) Student Test Page - Statistics 3 uestion Question 8 (1 mark) Attempt 1 The drying time of a certain type of paint under specified test conditions is known to be normally distributed with a standard deviation 9.1 min. Chemists have proposed a new additive designed to decrease average drying time. It is believed that drying times with this additive will remain normally distributed with standard deviation 9.1 min. A recent random sample of 30 observations yielded a sample mean of 56.55 min. Construct a 95% confidence interval for the true average drying time. za 1.282 1.645 1.960 2.326 2.576 3.090 a(tail area) 0.1 0.05 0.025 0.01 0.005 0.001 %ile 90 95 97.5 99 99.5 99.9 Your answers can be rounded to three decimal digit accuracy when entered, Lower limit is = Skipped Upper limit is = Skipped Submit... Previous Next... st Menu

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