PH Lecture 11

Question 0

Displaying continuous data from lowest to highest number is called

Answer 0

Ordered array

Question 1

Best way to display continuous data

Answer 1

Grouped frequency distribution

Question 2

What are the columns in a grouped frequency distribution?

Answer 2

Interval
Frequency
Cumulative frequency
Relative frequency
Cumulative relative frequency

Question 3

What chart is most useful for small datasets?

Answer 3

Stem and leaf charts

Question 4

What chart is best to use when you want to catch data entry errors?

Answer 4

Histogram

Question 5

What are the measures of central tendency?

Answer 5

Mean
Median
Mode

Question 6

Which measure of central tendency is most affected by outliers?

Answer 6

Mean

Question 7

Which measure of central tendency is easiest to calculate?

Answer 7

Median

Question 8

Which measure of central tendency is most robust to outliers?

Answer 8

Median

Question 9

How do you know if you have a symmetric distribution?

Answer 9

Mean = median

Question 10

What is the inter quartile range?

Answer 10

75th percentile - 25th percentile

Question 11

What is variance?

Answer 11

Average of the squared difference from the mean

Average of: (mean-data point)^2

Question 12

What is the equation for standard deviation?

Answer 12

Square root of variance

Question 13

Difference between population variance and sample variance

Answer 13

Population variance divides by N, sample variance divides by n-1

Question 14

When do you use coefficient of variation?

Answer 14

When you want to compare two different groups with the same measure

Question 15

Equation for coefficient of variation

Answer 15

CV=(sd/mean)*100

Question 16

What measure of central tendency is the 50th percentile?

Answer 16

Median

Question 17

Quartile formula

Answer 17

Q1=1(n+1)/4
Q2=2(n+1)/4
Q3=3(n+1)/4

Question 18

Equation for interquartile range

Answer 18

IQR=Q3-Q1

Question 19

Discrete variables give you what kind of distribution?

Answer 19

Binomial distribution

Question 20

Continuous variables give you what kind of distribution?

Answer 20

Normal distribution

Question 21

3 things that make up the Bernoulli process

Answer 21

1) 2 mutually exclusive (independent) outcomes “Bernoulli Trial”
2) probability is constant
3) each trial is independent