Quiz created: 090526

Quiz 6 (Due in section week of May 25)

Instructions: Answer the multiple choice questions, guessing if necessary; then click on the "Process Questions" button at the end of the quiz to see your score in the adjacent message box. The program will not reveal which questions you got wrong, only how many points you have. Go back and change your answers until you get them all right. (The message box will rejoice at that point and the page will change color to show it is tickled pink.)

Points to note: (1) Questions with only one possible answer are one point each. (2) Questions with one or more possible answers (represented by check boxes) give a point for each correct answer, but also subtract a point for each wrong answer! (3) The program will not attempt to score your efforts at all if you have not tried at least half of the questions. (4) This quiz is for your own use only. No record of your progress is kept or reported to anyone.

1. Suppose you had a variable X (the weight of fish in a pond for instance) distributed Normal with mean 5kg and standard deviation 10kg. Note: It's common practice to denote such a distribution N(5,10). What is the probability of getting a value larger than 17kg if you randomly selected a specimen from this population? (Hint: Use the applet from lecture: http://davidmlane.com/hyperstat/z_table.html).
.214 
.115 
.765 
.470 
No Answer
2. Suppose you had a population distributed N(0,10) what is the probability of pulling a specimen larger than (17-5)kg?
0.214 
0.765 
0.115 
0.470 
No Answer
3. Suppose you had a population distributed N(0,1) , what is the probability of pulling a specimen larger than (17-5)/sqrt(10)?
0.214 
0.470 
0.115 
0.765 
No Answer
4. Is it a coincidence that the p-value of the statistics in each of the above questions is the same?
No. 
No. 
No. 
No. 
All of the above are correct. 
No Answer
5. Suppose there was a population of fish in a pond and you knew they were distributed N(?,5) where 5 means the standard deviation of the population equals 5 and " ? " means you don't know what the mean is. (No I don't know why you know the variance and not the mean, but thanks for asking again.) Suppose you took a sample of size 100 to estimate the population mean and computed a sample mean of 15.5kg. What is the 95% CI for the population mean?
17.3 ± 2 
15.5 ±(1.96)0.05 
15.5 ± (1.96)0.5 
15.5 ±(1.96)1.5 
No Answer
6. Keep the same assumptions as the previous question but assume your sample consisted instead of 10000 specimens. What is the 95% CI for the population mean?
9.7 ± (1.96)1.3 
15.5 ± (1.96)1.5 
15.5 ± (1.96)0.05 
15.5 ± (1.96)0.5 
No Answer

      Points out of 6:

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This consummately cool, pedagogically compelling, self-correcting,
multiple-choice quiz was produced automatically from
a simple text file of questions using D.K. Jordan's
dubiously original, but publicly accessible
Think Again Quiz Maker
of October 6, 2008.