The percentage of companies that use social-media tools and technologies has been increasing over the past several years. A random sample of 170 companies found that 80 of them use social-media tools and technologies. (a) Calculate the sample proportion that used social media tools and technologies. (4 pts) (b) Calculate a 95% confidence interval estimate of the proportion of companies that use social-media tools. (5 pts) (c) A tech executive was recently quoted in an article saying that more than 60% of companies use social media tools. Does your confidence interval support that claim? Why or why not? (3 pts) (d) Calculate the necessary sample size to achieve a margin of error of .05 or less at 95% confidence. (3 pts) Perform all of your calculations in an Excel spreadsheet. Clearly label the answers to the questions. Please include your name in the upper left corner. Upload the file containing your work. Upload Choose a File