Quarter 1 Exam Review #2

REMINDER...Bring your matchbox cars next class for the competition. ASN4 is due today, hand it in as I will be in this evening to pick it up.

Refer to the data set on pg. 104 #16 "Eat Your Vegetables"

1. Enter this data into a TI84 calculator list.

2. Use the TI84 to put the data in ascending order. [2nd Stat OPS 1:SortA(L#) ]

3. Use the TI84 to calculate the sample mean, sample standard deviation, minimum, quartile 1, median, quartile 3, and the maximum. Report these values using the appropriate notation.

4. Note that the values above are all statistics. What would the parameter for both the mean and standard deviation measure and what notation would you use to label these unknown values?

5. Describe, in words and values, the variation in vegatable servings. Describe, in words and values, the variation between avearge vegatable servings among samples of size 40 individuals.

6. Use the TI84 to make a boxplot of the data. There are no outliers in the data. How do you know this by looking at the boxplot? Exactly how close does the maximum value of 11.1 servings come from being an outlier? Do Math!

7. Use the TI84 to make a histogram of the data. What is the shape of this distribution?

Direction for graphing a histogram using the TI84
2nd Y=
turn Plots ON
Use the right arrow key to highlight the histogram shape for "Type"
Now press Zoom 9 to graph the histogram

8. Use the trace key on the histogram to determine the default classes and respective class frequencies (note the class boundaries are not pretty).

9. Now lets adjust the defaults of the TI84 classes. Press the window key. Change the Xscl to 2 instead of 1.8166... This will change to class width to 2. Change the Xmin to 0 instead of 0.2. This changes the first lower class boundary to 0 instead os 0.2. Now press graph (NOT zoom9)

10. Use the trace key again to see that the classes are now "pretty" i.e. 2 --<4, 4--<6, 6--<8, 8--<10, and 10--<12. Use this updated histogram to set up a frequency distribution table (not including relative or cumalative frequencies)

11. Review the sorted data in the list. Use this ordered data to construct a stem and leaf by hand. (Do not split the stem and do not truncate the data) What is the leaf unit?

12. If you were to calculate a trimmed mean for this "vegetable servings" data, what would be the denominator in the compuation?