Question

How well materials conduct heat matters when designing houses, for example. Conductivity is measured in terms of watts of heat power transmitted per square meter of surface per degree Celsius of temperature difference on the two sides of the material. In these units, glass has conductivity about 1. The National Institution of Standards and Technology provides exact data on properties of materials. Here are 11 measurements of the heat conductivity of a particular type of glass. 1.10 1.05 1.11 1.06 1.13 1.07 1.08 1.15 1.17 1.18 1.14 (a) We can consider this an SRS of all specimens of glass of this type. Make a stemplot. (Enter your answers from smallest to largest. Enter NONE in any unused answer blanks.) Stems Leaves 1.0 1.0 1.1 1.1 Is there any sign of major deviation from Normality? O The stemplot shows that the data is skewed to the left with one outlier. O The stemplot shows that the data is skewed to the right with one outlier. The stemplot shows that the data are not skewed and have no outliers. (b) Give a 99% confidence interval for the mean conductivity. (Use 3 decimal places.) ( COTTO

Answer 1

sal write give data in ascending order is - 1.05, 1.06, 1.07, 108, bilo, bil1, 1,13,1.14, 1.15, 1.17, 1.18 a) Leaves Stems Ś,6 1.o 7,8 1.o 0, 1, 3, 4 lid tod 5, 7, 8 The stemplat shows that the data are not skewed and have no outliers. mean is - (b) 99% confidence interval for the -LO dt- n-1 Q-0.01 talaidt to 3.169 From the given data X 1.113 , S = 0.045 n: LL Cu = x + 4 x S de In 1.113 — •3.169*0.045 IL 1.113 0.043 - (1.070, 1.156)