Past data indicates an 80 (0.8) success rate in treating a certain medical problem. A new treatment is used on 100 patients in a clinical trial. It is successful in 87 (0.87) of the cases. What is the value of the z-score that can be used to test the null hypothesis that the success rate is 80?
a. 7
b. 2
c. 1.75
d. -1.75
Question 2
College students spend a lot of their money, not on things they would like to buy, but on text books. College text books have increased in price significantly over the past few years. The amount students spend on text books is approximately normally distributed with a standard deviation of 50 . The average amount spent on books each semester is 340 for undergraduate students and 250 for graduate students. Independent random samples of 100 undergraduate students and 80 graduate students are to be selected and the average amount they spent on text books last semester is to be compared (undergraduate graduate). What is the probability that the difference between the sample means is greater than 100?
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Problem