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Context: You have been commissioned by a hospital to find out if waiting times to see...

Context: You have been commissioned by a hospital to find out if waiting times to see a doctor have changed. In a previous study the mean waiting time was 11 minutes with a population standard deviation of 3 minutes. You observe the waiting room for a day and record that 40 patients visited the doctor and the mean waiting time was 12 minutes with a standard deviation of 3.42 minutes. At the 0.05 level of significance, has the waiting time changed?

1a) What is the value of your lower critical value?

1b) What is the value of your upper critical value?

Math   Statistics-And-Probability   
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