Ultra high performance concrete (uhpc) is a relatively new construction material that offers strong adhesive properties with other materials. the authors of "adhesive power of ultra high performance concrete from a thermodynamic point of view" (j. of materials in civil engr., 2012: 1050-1058) investigated the intermolecular forces for uhpc connected to various substrates. as reported in the article, here are the work of adhesion measurements (in mj/m^2) for five samples of uhpc adhered to steel:
107.1 109.5 107.4 106.8 108.
1 is it plausible that the given sample observations were selected from a normal distribution?
2.calculate a two-sided 95% confidence interval the true average work of adhesion tor uhpc adhered to steel. does the interval suggest that 107 is a plausible value for the true average work of adhesion for uhpc adhered to steel? what about 110?