A market research firm is hired to survey 600 households whether they have at least one kid. Of the 600 people surveyed, 320 responded yes - they have at least one kid. Using a 95% confidence level, find a lower and upper level of the confidence interval estimate for the true proportion of households with kids. Write your answer in percents, round the number to the nearest tenths place.Find the a/2 (the area in one tail outside of the confidence interval) and the critical value z a necessary to construct a 90% confidence interval. Round the za to the nearest thousandths 2 place