rently takes users a mean of 11 minutes to install the most popular computer prog any. After changes have been made to the program, the company executives want tes so that they can change their advertising accordingly. A simple random sample for them to install the software. The sample mean is 10.7 minutes with a standard at the 0.10 level of significance to see if the mean installation time has changed. p 3 of 3: Draw a conclusion and interpret the decision. swer We reject the null hypothesis and conclude that there is sufficient evid Onew mean installation time is different from 11 minutes and that Rode advertising. We fail to reject the null hypothesis and conclude that there is sufficien O that the new mean installation time is different from 11 minutes and th advertising.