How well materials conduct heat matters when designing houses, for example. Cond

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. The National Institute of Standards and Technology (NIST) provides data on properties of materials. Here are 9 NIST measurements of the heat conductivity of a particular type of fibrous-glass board:16 (a) We can consider this an SRS of all specimens of fibrous-glass board of this type. Make a stemplot. Is there any sign of major deviation from Normality? (b) Give a 95% confidence interval for the mean conductivity. (c) Is there significant evidence at the 5% level that the mean conductivity of this type of fibrous-glass board is not 0.0330?

Explanation / Answer

Descriptive Statistics Sample Size, n: 11 Mean: 1.118182 Median: 1.11 Midrange: 1.125 RMS: 1.118961 Variance, s^2: 0.0019164 St Dev, s: 0.0437763 Mean Abs Dev: 0.0343802 Range: 0.11 Coeff. Of Var. 3.91% Minimum: 1.07 1st Quartile: 1.08 2nd Quartile: 1.11 3rd Quartile: 1.18 Maximum: 1.18 Sum: 12.3 Sum Sq: 13.7728 Margin of error, E = 0.0294051 95% Confident the population mean is within the range: 1.088595

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