Week 1

Question 1

Experimental Unit

Answer 1

a physical entity that is the primary unit of interest in a specific research objective. Generally, the experimental unit is the person, animal, or object that is the subject of the experiment.

Question 2

Population

Answer 2

collections of all individuals or individual items of a particular type. At times a population signifies a
scientific system.

Question 3

Samples

Answer 3

Information is gathered in the form of samples, or collections
of observations. Should be random not biased.

Question 4

Sample Size

Answer 4

Number of units in the sample that are taken for measurement.

Question 5

Sample Mean

Answer 5

Average value of sample

Question 6

Sample Standard Deviation

Answer 6

Measurement of spread or variation in measurements

Question 7

Pareto Diagram

Answer 7

A Pareto chart is a bar graph. The lengths of the bars represent frequency or cost (time or money), and are arranged with longest bars on the left and the shortest to the right. In this way the chart visually depicts which situations are more significant

Question 8

Dot Diagram

Answer 8

a statistical chart consisting of data points plotted on a fairly simple scale. They are useful for highlighting clusters, gaps, skews in distribution, and outliers.

Question 9

Cumulative Distribution Frequency

Answer 9

When the number of new cases is increasing, the cumulative curve is “concave up.”
When the number of new cases is staying the same, the cumulative curve is linear. The slope of the curve indicates the number of new cases.
When the number of new cases is decreasing, the cumulative curve is “concave down.”

Question 10

Ogive Plot

Answer 10

plots cumulative frequency on the y-axis and class boundaries along the x-axis.

Question 11

Stem and Leaf Plot

Answer 11

A stem and leaf plot is represented in form of a special table where each first digit or digit of data value is split into a stem and the last digit of data in a leaf

Question 12

Arithmetic Mean

Answer 12

The mean (informally, the “average“) is found by adding all of the numbers together and dividing by the number of items in the set: 10 + 10 + 20 + 40 + 70 / 5 = 30

Question 13

Arithmetic Median

Answer 13

The median is found by ordering the set from lowest to highest and finding the exact middle. The median is just the middle number: 10 + 10 + 20 + 40 + 70 is 20.

Question 14

Arithmetic Mode

Answer 14

Most common value

Question 15

Range

Answer 15

Method to measure the dispersion of the values. Can be misleading when outliers are present. Does not take into account the distribution of bunching of values.

Question 16

Sample Variance

Answer 16

The sample variance, s^2, is used to calculate how varied a sample is. he variance helps you to figure out how spread out your weights are.
 When many values are away from the mean, the variance is large
 When many values are close to the mean, the variance is small

Question 17

Sample Standard Deviation

Answer 17

The root-mean square of the differences between observations and the sample mean

Question 18

Coefficient Variation

Answer 18

the ratio of the standard deviation to the mean and shows the extent of variability in relation to the mean of the population. The higher the CV, the greater the dispersion.

Question 19

Quartiles

Answer 19

three values that split sorted data into four parts, each with an equal number of observations.

Question 20

Percentiles

Answer 20

Percentiles divide ordered data into hundredths. To score in the 90th percentile of an exam does not mean, necessarily, that you received 90% on a test