A survey conducted for the Northwestern National Life Insura…

A survey conducted for the Northwestern National Life Insurance Company revealed that 70% of American workers say job stress caused frequent health problems. Suppose a random sample of 20 American workers is selected. Based on the relevant binomial distribution, answer the following questions about X, the number of American workers who say job stress caused frequent health problems:                                   What is the probability that X is no more than 7? Round your answer to 3 decimal places. For example, if the answer is 0.52443, enter 0.524

Data file: Datafile_Question 1.xlsx The file above contains…

Data file: Datafile_Question 1.xlsx The file above contains a random sample of 200 service times during the busiest hour of the day at a particular fast-food restaurant. Calculate a 95% confidence interval for the proportion of service times longer than 90 seconds. What are the values of lower limit (LL) and upper limit (UL)? Round your answer to 3 decimal places.   

The U.S. national average door-to-doctor wait time for patie…

The U.S. national average door-to-doctor wait time for patients to see a doctor is now 21.3 minutes. Suppose such wait times are normally distributed with a standard deviation of 6.7 minutes. Some patients will have to wait much shorter than the mean to see the doctor. Based on this information, 25% of patients will have to wait less than how many minutes to see a doctor? Round your answer to one decimal place.