What is the confidence coefficient? * 1 point 1.28 1.645 1.96 2.58 What is the maximum error?* 1 point O 0.13 0.35 0.44 0.56 What is the interval estimate of the population mean? * 1 point 16.37 - 16.63 O 16.15 - 16.85 16.06-16.94 15.94 - 17.06For items 16- 20. In a gymnasium, a physical exercise has a mean length of 30 minutes with a standard deviation of 6 minutes. A PE major wants to estimate the true mean length of the exercise with a margin of error of 0.5 at 95% confidence level. What is the confidence level? * 1 point 90% O 93% O 95% O 99% What is the confidence coefficient? * 1 point 1.28 O 1.645 O 1.96 2.58 What is the lower limit? * 1 point 25.5 27.5 29.5 O 35.5What is the upper limit? * 1 point O 26.5 O 28.5 30.5 O 36.5 How many respondents does the PE major need? Formula: n=((z_(a/2). * 1 point 6)/E)^2 O 450 O 500 O 553 O 579