Topic 5: Standard Deviation (Measure of Variability)

Question 1

Measures of Dispersion (3)

Answer 1

Range
Quartile
Standard deviation

Question 2

is a statistic that measures the dispersion of a dataset relative to its mean.

Answer 2

Standard deviation

Question 3

is the most popular measure of dispersion.

Answer 3

Standard deviation

Question 4

is denoted by Greek letter sigma

Answer 4

Standard deviation

Question 5

is denoted by Greek letter MU

Answer 5

mean

Question 6

Lower the value of ____ ___, lower the process of variability, thus data points are closer to the mean.

Answer 6

standard deviation

Question 7

higher ____ ___ means that the data is more spread out or away from the mean

Answer 7

standard deviation

Question 8

to determine How much data spreads from its “typical” value/Mean

Answer 8

The empirical rule

Question 9

is the spread of your data from the lowest to the highest value in the distribution.

Answer 9

Range

Question 10

Range is affected by the ____

Answer 10

Outliers

Question 11

the 68–95–99.7 / three sigma rule, also known as the ___ __, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution

Answer 11

the empirical rule

Question 12

It tells where concentrated our data sets is

Answer 12

Boxplot

Question 13

68% of data points are within ___ standard deviation /so may 32% outside data points of __ standard deviation

Answer 13

1st

Question 14

95% of data points are within ___ standard deviation /so may 5% outside data points of __ standard deviation

Answer 14

2nd

Question 15

99.7% of data points are within ___ standard deviation /so may 1% outside data points of __ standard deviation

Answer 15

3rd

Question 16

how many data points or “observations” you have

Answer 16

Count

Question 17

is two ratios set equal to each other; comparison between two numbers.

Answer 17

proportion

Question 18

Philippines-based company engaged in property-related activities, such as project design, construction and property management.

Answer 18

Megaworld corp.

Question 19

When to buy stocks?

Answer 19

Determine using MEAN. If the data are closer to the mean, then its good to buy stocks. (3 standard deviation)

If data is high or low, we look to STANDARD DEVIATION.

Its up to us. More data, more chance we can predict if the stock will go up or down.