Types of Data (levels of measurement)
● The Higher the data level the more sophisticated analysis you can perform Nominal: Labels or names used to identify an element, a non numeric label or a numeric code may be used. (ex. Hair color, marital status, could you m for married for s for single)
Ordinal: have the properties of nominal data but the order or rank of the data matters. A non numeric label or numeric code may be used. (ex. Freshman, Sophomore, Junior, Senior) - Likert Scale Data: Rate your experience on a scale from 1-10
- Ordinal data should NOT be multiplied
Interval: Have properties of ordinal data, with an interval between observations expressed in a fixed measurement. Always numeric (ex. Temperature scale)
Ratio: has the property of interval data and the ratio of two values is MEANINGFUL. Must have a zero scale to represent that nothing exists at zero (ex. Distance, weight, time. Money in your bank account vs money in your parent's bank account)
Difference between histogram and bar chart Don't forget about the age old question of What is a paramecium?
- No spaces
- Bar chart has categories as one axis and numerical values on the other axis, Histogram has two numerical values on both axis.
- Histogram has interval or ratio data
** Notice that when taking the sample you divide by the total amount of numbers minus 1If you want to learn more check out How does a modem work?
This is saying how many standard deviations away the numbers are If you want to learn more check out How did the work of barry schwartz and allen neuringer support or advance the understanding of response stereotypes and response variability?
If you want to learn more check out Gregory gets very emotional while watching sad romance movies and normally cries during them. which archetype is he displaying?
Weighted Mean: mean of data values that have been weighted according to their relative importance
Xi = value of observation (the ith data value)
Wi = Weight for observation i
Calculating a weighted mean
1. Collect the desired data and determine the weight to be assigned to each data value (ex. If you take all the assignments from a class and then list the points possible and the points you actually got)
2. Multiply each weight by the data value and add them all together. = (140)(150) + (100)(100) + (50)(50) + (25)(50) + (150)(200) + (250)(200) = 115500
3. Sum the weights for all values (what you received on the assignment)
= 140 +100 + 50 +25 +150 +200 = 665
4. Compute the weighted Mean.
- Divide the weighted sum by sum of the weights
115500 ÷665 = 173.68
Means that you know all of your probabilities and they all add up to one
q= 1 - p
n = Sample Size
T = Sample Size ÷ Segment size