A crossover trial is a type of experiment used to compare two drugs. Subjects take one drug for a period of time, then switch to another. The responses of the subjects are then compared using matched-pair methods. In an experiment to compare two pain relievers, seven subjects took one pain reliever for two weeks, then switched to the other. They rated their pain level from 1 to 10, with larger numbers representing higher levels of pain. Can you conclude that the mean pain level is less with drug B? Use significance level 0.10. (Paired samples).

What runs in user mode

            A.        Email reader

            B.        Web browser

            C.        User Interface Program

            D.        Music Player

            E.            Operating system

            F.         Device drivers

Choose one the following

            a.         a and e

            b.         a b,c,d

            c.         a,f

            d.         e,d

            e.         f,b

2)         Choose which are parameters of a process table entry

            A.        Process ID

            B.            Program Counter

            C.        Stack Pointer

            D.        User ID

            E.         Signals

Choose one of the following

            a.         a, b,

            b.         d, e

            c.         a, d

            d.         a, b,c,d

            e.         a, b, c, e

3)         What are the peripheral components which are directly connected to the computer bus.

            A.            Monitor

            B.            Keyboard

            C.        CPU

            D.            Memory

            E.         Hard-Disk

Choose one of the following

            a.         a, b, c

            b.         a, b, e

            c.         c, d

            d.         a, b, c, d

4) What is operating system?

            A.            collection of programs that manages hardware resources

            B.        system service provider to the application programs

            C.        link to interface the hardware and application programs

            D.        all of the mentioned

5) If a process fails, most operating system write the error information to a

            a.         A log file

            b.            Another running process

            c.         A new file

            d.         None of the mentioned

6) To access the services of operating system, the interface is provided by the

            a.         System calls

            b.          API(Application Programmers Interface)

            c.         Library

            d.            Assembly Instructions

7) Which one of the following error will be handle by the operating system?

            a.         Power failure

            b.         Lack of paper in printer

            c.            Connection failure in the network

            d.         All of the mentioned

Q1. (b) Two operators have taken three measurements for each of 10 parts number during a gauge capability study as shown in Table 1.

(i)        Does the control chart analysis of the data indicate any potential problem in using the gauge?

  (ii)       Determine the standard deviation of the measurement error.                

Table 1

Appendix A:

Table Q1[b]

A certain drug is tested for its effect on blood pressure. Seven male patients have their systolic blood pressure measured before and after receiving the drug with the results shown below (in mm Hg).

                                    Patient                SBP before       SBP after

                                         1                          120                  125

                                         2                          124                  126

                                         3                          130                  138

                                         4                          118                  117

                                         5                          140                  143

                                         6                          128                  128

                                         7                          140                  146

a. (2) State, in prose, the study hypothesis (two-tailed).

b. (2) What test statistic(s) test would you use?

c. (2) What is the critical value of the test statistic?

d. (3) If the value of the test statistic is t = 2.67, what do you conclude (reject/do not reject is not sufficient).

An experimental drug is being tested to see if it reduces blood sugar in patients suffering from diabetes. Each of seven patients will receive both the placebo and the experimental drugs (treatments given a month apart) for a two week period. The maximum blood sugar (measured every day) on the second week of treatment is recorded. The data obtained from such a study is shown below:

Conduct a hypothesis test to determine whether the new experimental treatment is beneficial for treating diabetes.  

a) TV commercials are swamped with prescription drugs for anxiety, depression, impotence, and heartburn. Oftentimes, a drug company would try to get consumers to ask their doctors to switch to their products. This has something to do with the patent. The patent on the old drug runs out that year, soon the price will go down as other companies can produce the same drug. The new ads that ask consumers to switch is a way of building loyalty to a new, monopolized brand at a time when the old monopoly will soon disappear.    Now: Microsoftintroduces new operating systems every three or four years. How is this behavior similar toor different from the drugs case? State two similarities and two differences.

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