A survey is planned to compare salaries of plant managers in two regions. The plan is to take a sample of 200 plant managers from each region and ask their annual salaries. Assume that previous sample statistics suggest that o, = 0, = $3000. Are the sample sizes sufficient to produce a 99% confidence interval on 144-Hy having a width of only $1000? Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. people each The sample sizes sufficient because the samples would need to be at least which is the planned sample sizes of 200. (Round up to the nearest whole number as needed.)