Quizzes

Prequiz Comments

The quiz on September 8 will have one question dealing with my discussion of Ch. 1 and one question dealing with my discussion of the parts of Ch. 3 that I covered. Specifically, the question based on Ch. 3 will deal with Rule 1 on p. 88 and Rule 5 on p. 89 of S&W (Samuels and Witmer). Note that the event E in Rule 1 can be any event --- so the rule holds true if E = A ∩ B or E = A ∪ B, where A and B are any two events (since the intersection of any two events is also an event, and the union of any two events is also an event). Also note from Figure 3.8 on p. 89 of S&W that the intersection of two events cannot be larger than either of the two events, and the union of two events cannot be smaller than either of the two events. I won't give the quiz at the start of class, and so perhaps when I discuss more of the material from Ch. 3 at the start of class you'll gain a better understanding of the rules of probability (and you'll have a chance to ask about things from last week which were not made sufficiently clear).

Postquiz Comments

Since altogether quizzes will count 10%, I think I'll grade each quiz on a 1 point scale (so 0 ≤ score ≤ 1, just like for probabilities), and then sum your best 10 scores at the end of the semester (dropping 3 low scores for each student if we wind up having 13 quizzes) to get a overall quiz contribution on a 10 point scale. *** 10 of 12 students gave the 1st answer correctly, but only 4 of 12 students gave the 2nd answer correctly. For final scores, there are 3 scores of 1, 8 scores of 0.5, and 1 score of 0. I hope that if you didn't do well as you expected to, you won't get too discouraged. Many of the quizzes in the future will be more straightforward. *** On a more positive note, there was perfect attendance for the quiz. Even though attendence doesn't directly count in the determination of the final grades, if students attend class and turn in homework regularly, I'll be more inclined to avoid giving bad grades --- that is, a good effort on the class as a whole will mean better grades on the whole (although individual results may vary). Please read over my explanations for the answers since I don't want to spend class time going over the quiz (but I am willing to discuss the quiz before or after class).

Prequiz Comments

The quiz on September 15 will have several parts to it that are similar to the parts on two quizzes that I gave in STAT 535 last fall. If you understand how to do the parts on Quiz #1 from last fall and Quiz #2 from last fall, then you should be sufficiently prepared for this week's quiz.

Postquiz Comments

I'm happy to report that 10 out of the 12 students in the class got a perfect score. Each of the other two students got one of the two answers wrong because they assumed independence when determining the probability of an intersection of two events, and independence should not have been assumed. Please read over my explanations for the answers.

Prequiz Comments

The quiz on September 22 will have have two parts to it, each dealing with a continuous random variable, with at least one of them being a normally distributed random variable. I recommend studying two quizzes that I gave in STAT 535 in previous years: Quiz #3 from Fall 2003 and Quiz #3 from Fall 2004.

Postquiz Comments

7 out of the 12 students in the class got a perfect score. (Note: Even for multiple choice quizzes, I may sometimes award a small amount of partial credit for an incorrect answer if you show some reasonable work.) Please read over my explanations for the answers.

Prequiz Comments

The quiz on September 29 will pertain to using the sample mean and/or sample median to estimate a distribution mean and/or distribution median. Quiz #4 from Fall 2004 is somewhat similar.

Postquiz Comments

8 out of the 12 students in the class selected the correct answer. Please read over my explanation for the answer.

Prequiz Comments

The quiz on October 6 will have one multiple choice question pertaining to confidence intervals.

Postquiz Comments

Only 2 students, out of 11 in the class who took the quiz, chose the correct answer. Here is an explanation for the answer. At this point, only one student has scored a 1 on each of the first five quizzes.

Prequiz Comments

The quiz on October 13 will have two True/False questions pertaining to the robustness and/or validity of Welch's confidence interval procedure for normal and/or nonnormal distributions.

Postquiz Comments

9 out of 12 students got both of them correct. Here is an explanation for the answers. At this point, only one student has scored a 1 on each of the first six quizzes. Recall that at the end of the semester, I plan to count your best 10 of 13 quiz scores. To give you some idea about how you're doing relative to others, if I sum the best 5 out of 6 scores for everyone, 5 students have a cummulative score of either 4.5 or 5, and 7 students have a cummulative score in the range 2.5 to 4.

Prequiz Comments

The quiz on October 20 will have one multiple choice question pertaining to terminology that I use. (For example, what is meant by conservative and anticonservative tests and confidence intervals? What does it take for a test or confidence interval procedure to be considered to be valid in a certain situation? What is meant by homoscedasticity and heteroscedasticity? What is meant by saying that a test has high power or low power in a certain situation?) This quiz, this quiz, and this quiz (all of which were used previously in STAT 535) cover some important concepts and are of a similar nature to what I have in store for you this year.

Postquiz Comments

9 students, out of 11 in the class who took the quiz, chose the correct answer. Here is an explanation for the answer.

Prequiz Comments

The quiz on October 27 will have five True/False questions pertaining to the use of the sign test and the signed-rank test.

Postquiz Comments

4 out of 12 students got them all correct, and 6 students got 4 out of 5 right. Here is an explanation for the answers. Recall that at the end of the semester, I plan to count your best 10 of 13 quiz scores. To give you some idea about how you're doing relative to others, if I sum the best 6 out of 8 scores for everyone, 5 students have a cummulative score of either 5.8 or 6, 2 students have a cummulative score of 5.3, and 5 students have a cummulative score in the range 3.6 to 4.7.

Prequiz Comments

The quiz on November 3 will have two True/False questions pertaining to the one-way ANOVA F test.

Postquiz Comments

Here is an explanation for the answer.

Prequiz Comments

The quiz on November 10 will have one multiple choice question pertaining to Friedman's test. It ought to be sufficient to review your notes about Friedman's test. Here is a similar quiz I gave last fall about the Kruskal-Wallis test. Your quiz will cover some basic aspect of Friedman's test --- it'll be about something I said in class, and if you wrote down what I put on the board, you ought to have the information that you need.

Postquiz Comments

10 out of 12 students got the right answer. Here is an explanation for the answer.

Prequiz Comments

The quiz on November 17 will have one multiple choice question pertaining to residuals.

Postquiz Comments

5 out of 12 students got the right answer. Here is an explanation for the answer.

Prequiz Comments

The quiz on December 1 will have one multiple choice question pertaining to residuals (and so will be a bit similar to the previous quiz).

Postquiz Comments

All students gave the correct answer. Here is an explanation for the answer.

Prequiz Comments

The quiz on December 8 will have one question pertaining to analysis of covariance.

comments about quiz component of course grade