Assignment 3 Score: 0/100 0/20 answered Question 11 A professor wants to estimate how long students stay connected during two- hour online lectures. From a random sample of 18 students, the mean stay time was 90 minutes with a standard deviation of 11 minutes. Assuming the population has a normal distribution, develop a 95% confidence interval estimate for the population mean by determining the following values: 1. a) Point Estimate = b) df= Significance level (a) = c) Determine the critical value rounded to 3 decimal places. Enter a positive value. [3 decimal places] Critical value = d) [3 decimal places] Standard Error = e) [1 decimal place] Margin of Error = f) [1 decimal place] Lower Confidence Limit = g) [1 decimal place] Upper Confidence Limit = 2. Should we reject a claim that the population mean, = 81 minutes? Why? Select an answer 3. If the sample size decreases, what will be the effect on the margin of error? Select an answer Question Help: Video Message instructor Submit Question 2 Should we rainst a claim that the nonulation moon 81 minutes? Why? Select an answer No. Because 81 lies outside the confidence limits No. Because 81 lies within the confidence limits Yes. Because 81 lies within the confidence limits Yes. Because 81 lies outside the confidence limits the margin of Submit Question 3. If the comple size decrencse what will be the effect on the margin of errc Select an answer The margin of error will decrease. Question The margin of error will not change. The margin of error will increase. Submi Assignment 3 Score: 0/100 0/20 answered Question 12 Using two different confidence levels, a researcher constructs two confidence intervals for a population mean based on one sample taken from a normal population with known population variance = 841. The standard error of the mean is 4.902. The confidence intervals are: Interval 1: 84.02 < < 95.58 Interval 2: 83.23 Assignment 3 Score: 0/100 0/20 answered Question 13 Using two different confidence levels, a researcher constructs two confidence intervals for a population mean based on a sample of size n = 14. The standard error of the mean is 6.9488. Assume the population is normally distributed and the population standard deviation is unknown. The confidence intervals are: Interval 1: 70.719