MATH1280 Statistics 1 Learning journal UNIT1
Grades 10/0-10
1. Learning Journal Reflective Comments:
Write short reflective comments or notes about your learning activities during the week. It is highly recommended that you make these entries on a daily basis. You will be assessed on the completeness of your Learning Journal, and the quality of your self-reflection.
You should date each entry, and use clear titles and sub-headings. These entries should be brief, direct sentences indicating quick comments or notes such as:
* when you completed each step in the Learning Guide during the week,
* any problems or unexpected events that occurred during the week (including
problems understanding new or old material), and
* any other noteworthy that might affect your performance in this class.
There is no need to include personal information or details of family events, but be sure to mention the existence of any situations that will positively or negatively affect your ability to focus on the classwork.
2. Vocabulary and R functions
Enter the following command in R to read a simple help page about the table() command (this is for your information, you do not need to show the output):
?table
Now enter the following command and describe the output of the table() command. What does the first row of numbers in table() output represent? What does the second row of output represent?
x <- c(5, 8, 4, 1, 5, 6, 5, 9, 4, 2, 5, 7, 5, 3, 6, 4, 5, 3, 7, 6)
table(x)
[optional: You can test your theory by altering the numbers and rerunning the table command.]
3. Task (References: Question 1.1 page 10-12 and self-Quiz Unit 1 Question 6 and 7)
a) Read section 1.5 in the Yakir textbook. If you were a teacher and had 30 students in your class and wanted to know the class average on the first quiz, would you use a parameter or a statistic? Why?
b) If you wanted to know how many people in your country recognize the name of your new company, would you use a parameter or a statistic? Why?
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1. Learning Journal Reflective Comments:
6/17: Reading the learning guide
6/19: Understanding vocabulary
6/20: Installing R and testing it / Reading textbooks and do the same on R
6/21: Doing Youtube tutorial and learned about R programming's syntax.
6/22: Apply for the discussion Forum
So far, I understand all the contents, and it is going well. This week was easy because I could solve everything by typing the same as it was in the textbook, but I'm worried about the following course. I will do my best.
2. Vocabulary and R functions
x <- c(5, 8, 4, 1, 5, 6, 5, 9, 4, 2, 5, 7, 5, 3, 6, 4, 5, 3, 7, 6)
table(x)
x
1 2 3 4 5 6 7 8 9
1 1 2 3 6 3 2 1 1
What does the first row of numbers in table() output represent?
The first line shows the numbers in ascending order, with duplicate numbers removed.
What does the second row of output represent?
The second line shows the number of times a particular number appears.
1⇒1 time, 2⇒1 time, 3⇒2 times, 4⇒3 times, 5⇒6 times, 6⇒3 times, 7⇒2 times, 8⇒1 time, 9⇒1 time
3. Task (References: Question 1.1 page 10-12 and self-Quiz Unit 1 Question 6 and 7)
a) Read section 1.5 in the Yakir textbook. If you were a teacher and had 30 students in your class and wanted to know the class average on the first quiz, would you use a parameter or a statistic? Why?
I use a parameter. The class of 30 students is a population and a parameter shows the measurement of the population.The computation of statistics requires data from other months, but there is no other data because it is the first quiz. Therefore, I can not use statistic in this case.
b) If you wanted to know how many people in your country recognize the name of your new company, would you use a parameter or a statistic? Why?
I use statistics. Because a statistic is the measurement of a sample and can compute the value of the average from the data.
Self-Quiz Unit 1 Question 6
The average number of calls that arrived between 8:00 AM and 8:10 AM during the working days of any month is:
Select one:
a. A population.
b. A sample.
c. A parameter.
d. A statistic.
Answer: c. A parameter.
Self-Quiz Unit 1 Question 7
The average number of calls recorded in the object "Feb" is 5.85. The average in the object "Sep" is 8.5. The difference between these two numbers is:
Select one:
a. A population.
b. A sample.
c. A statistic.
d. None of the above.
Answer: c. A statistic.
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