A GlobalWebIndex study noted the percentage of Internet users that owned various devices. Suppose that a survey of 1,000 Internet users found that 840 own a PC/laptop, 910 own a smartphone, 500 own a tablet, and 100 own a smart watch.

Source: Data extracted from “GWI Device,” GlobalWebIndex Quarterly Report, Q1 2017 bit.ly/2qBks0x.

a. Construct 95% confidence interval estimates for the population proportion of the devices Internet users own.

b. What conclusions can you reach concerning what devices Internet users own?