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QUESTION 4 In which of the following situations is it impossible to construct a condence interval for the population proportion? O n = 150, x = 20 O n = 100, x = 4 O n=300, x= 290 O n = 15, x = 7 QUESTION 5 Assume that the time spent on social media daily by ZU students has a mean of 120 minutes and a standard deviation of 27 minutes. If a random sample of 73 students is selected, nd the standard error of the sampling distribution of the sample mean? Round your answer to 2 decimal places. QUESTION 6 In a company, the HR department is able to identify a small number of staff members who were clocking in at irregular hours in the morning. To determine the punctuality of the staff members, the HR manager would like to identify whether the staff members' travel time to work (in minutes) affects their punctuality. A random sample of 16 staff members revealed a mean of 12 minutes with a standard deviation of 4.9 minutes. Assume the underlying distribution of the travel time to work is normally distributed. Find the upper condence limit of the 95% condence interval estimate for the mean travel time to work. Round your answer to two decimal places