35 The ages of internet users are approximately normally distributed with mean and standard deviation of 36.9 years and 13.9 years, respectively. Suppose you wish to find the 80th percentile of this distribution. Draw the figure and the desired area (See: upload file). (Non-anonymous question () * (2 Points)The ages of smartphone users approximately follow a normal distribution with mean and standard deviation of 36.9 years and 13.9 years respectively. Suppose you wish to calculate the interquartile range (IQR) of the distribution. Draw the figure and the desired area (See: upload le). (Non-anonymous question) * (2 Points) A department store found that it averages 362 customers per hour. Assume that the standard deviation is 29.6 and a random sample of 40 hours was used to determine the average. What is the point estimate for the population mean? * [133(1 Point) A department store found that it averages 362 customers per hour. Assume that the standard deviation is 29.6 and a random sample of 40 hours was used to determine the average. What is the 2 value for the 99% condence interval? * [13)(1 Point) A department store found that it averages 362 customers per hour. Assume that the standard deviation is 29.6 and a random sample of 40 hours was used to determine the average. What is the margin of error? (Note: use 99% condence level). * (1 Point) A department store found that it averages 362 customers per hour. Assume that the standard deviation is 29.6 and a random sample of 40 hours was used to determine the average. Find the 99% condence interval of the population mean. What is the upper limit? * (1 Point) A department store found that it averages 362 customers per hour. Assume that the standard deviation is 29.6 and a random sample of 40 hours was used to determine the average. Find the 99% condence interval of the population mean. What is the lower limit? * ['30 Point) Out of 500 students surveyed, 298 said they are registered voters. We wish to estimate the true percent of all students that are registered voters. What is the margin of error? (Note: use a 90% condence level) * D36 Points) 48 The confidence interval at the 95% level of confidence for the true population proportion was reported to be (0.375, 0.425). Which of the following is a possible 90% confidence interval from the same sample? * [, (1 Point)46 A random sample of couples was asked, "Would you adopt a child?". Of the 150 people surveyed, 130 of them said that they would. What is a 95% confidence interval for the proportion? * [(1 Point)0.2123 Find the 2 value such that the area under the standard normal distribution curve between 0 and the 2 value is 0.2123. * [1:],(2 Points) [ii Let Y = liters of blood of adults be normally distributed with a mean of 5.2 and standard deviation of 0.3. You wish to calculate the percentage of adults who have less than 5.4 liters of blood in their system. Find the corresponding area. * 03(3 Points) Let Y = liters of blood of adults be normally distributed with a mean of 5.2 and standard deviation of 0.3. You wish to calculate the percentage of adults who have less than 5.4 liters of blood in their system. Find the corresponding 2 value. * (2 Points)