Question

please show all hypothesis teating steps

3. Composites are materials that are made by embedding a iber, such as glass or carbon, inside a matrix, such as a metal or a ceramic. Composites are used in civil engineering structures and their degradation when subjected to weather conditions is an important issue. In an experiment to investigate the effect of moisture on a certain kind of composite, the weight gains of a collection of 18 samples of composite subjected to water diffusion were obtained; the mean was 0.337 with a standard deviation of 0.025 (a) Is it safe to conclude from the results of this experiment that the average weight gain for composites of this kind is smaller than 0.367 Use α 0.05. (b) Construct a 95% confidence interval for the average weight gain for compos- ites of this kind.

Answer 1

em he ddi sen vq tes ative Hypro dhesis ttet Sample standard deviate ro-6-o.025 Test statin tie O.330 36 0.025 31032 cattudotel vame se 00s then we reject 山hypothesis at 5% ,pend

Herc,t. 032 avea dha - 36 o 025 03, 267 y"( D. 3y 7253) .