6 (14 pts). A survey wants to know whether people in a city with ages 16-19 years old spend less than 2 hours on TV daily. A sample of 600 people with the ages 16-19 show the sample mean x– = 1.9 hours. Suppose the population standard deviation σ = 0.3 hour. (a) What is the population? What is the sample? (b) At α = 0.01 level of significance, determine whether there is evidence that that the population mean is less than 2 hours. (c) Identify the type of error for your conclusion. Find the probability of error and probability of confidence if it is type I error.

Which surgical procedure has the highest potential for problems such as arteriovenous fistulas and retained valves? 

What is the typical normal volume through an arteriovenous fistula used for hemodialysis? 

When you are ready, please go to Pearson MyStatLab and find “exam 1 practice run”. 

8 (14 pts). The percentage of customer satisfaction for a hotel was 73% last year. The manager wants to know whether there is any difference of customer satisfaction between this year and last year. A survey of 544 customers shows that 386 customers are satisfied. (a)  What is the population? What is the sample? (b) At α = 0.05 level of significance, determine whether there is evidence that the percentage of customer satisfaction this year is different from 73%. (c) Identify the type of error for your conclusion. Find the probability of error and probability of confidence if it is type I error.

After completing the exercise study, you believe the patient has multi level arterial disease.  What is that conclusion based on?

A patient is sent to your laboratory to have his lower extremity bypass graft evaluated with duplex.  While performing the examination you notice that the velocity at the proximal anastomosis is 80 cm/s.  You continue the examination and obtain a pulse wave Doppler signal about 1cm distal to the proximal anastomosis and you get a velocity of 210 cm/s.  What do these findings suggest? 

Difficulty in breathing, of which the individual is aware is known as ______. 

A hypertensive diabetic 65 year old male present for cerebrovascular testing because of an asymptomatic bruit on the right side.  You are considering all of the following to be potential sources of the bruit EXCEPT:

Which of the following is an anterior circulation symptom?