1.1 Theory of Statistics

_ is the positive square root of the variance.

• Mean

• Median

• Standard deviation

• Variance

Which of the following are the categories of statistics?

• Descriptive statistics

• Inferential statistics

• Industry statistics

• Business statistics

Find the mode of 5, 3, 27, 5, 9, 3, 8, 5 :

• 3

• 5

• 9

• 27

The mean or average is also known as _

• Arithmetic mean

• Negative mean

• Population mean

• Sample mean

The smallest value of the standard deviation is _

• Maximum

• Least

• Zero

• None of these

The sum of all values is 240 and the number of readings are 20 then the arithmetic mean is _

• 8

• 12

• 32

• 1.667

A Greek letter that is used as a short hand notation for sum:

• Σ

• n

• x̄

• σ

The following numbers represent the ages of people on a bus: 5, 9, 13, 21, 17. Calculate the sum of their ages.

• 110

• 95

• 70

• 65

In statistics, a sample:

• Can be used for inferences but not for predictions

• Is a set of data taken from the population to represent the population

• Is another word for population

• Is only used in descriptive statistics

How do descriptive and inferential statistics differ?

• Descriptive statistics are more computationally sophisticated than inferential statistics

• Inferential statistics are more computationally sophisticated than descriptive statistics

• Descriptive statistics only attempt to describe data, while inferential statistics attempt to make predictions

• Inferential statistics only attempt to describe data, while descriptive statistics attempt to make predictions