Statistics and Bias

Which type of study best describes the situation?

• Survey

• Controlled experiment

• Observational study

• Census

?

• interviewing every 5th customer to come into the station

• interviewing customers chosen at random by a computer at the checkout

• interviewing customers who call an 800 # posted on the customers' receipts

• interviewing every customer who comes in chosen at random out of a hat

It is the branch of applied mathematics dealing with data collection, organization, analysis, interpretation and presentation.

• Algebra

• Trigonometry

• Statistics

• Geometry

What is the class mark of the third row?

• 24

• 24.5

• 25

• 25.5

a question that can be answered by collecting data that vary.

• Quartiles

• Statistical Questions

• Box Plot

A scientific body of knowledge which deals with collection, presentation, interpretation and analysis of data.

• Probability

• Statistics

• Sequence

• Geometry

Choose the correct concept:

• Is a diagram in which the numerical values of variables are represented by the height or length of lines or rectangles of equal width.

• The number of observations is marked with a single point at the midpoint of an interval.

• Is an accurate representation of the distribution of numerical data. It is an estimate of the probability distribution of a continuous variable.

• The graph is divided into sectors, where each sector shows the relative size of each value

According to the portion of the frequency table given, how many people have an MBA?

• 9

• 20

• 60

• Not enough information

What is the total frequency?

• 200

• 215

• 224

• 225

Statistic help us to...

• obtain data and then organize and analyse

• obtain data and then organize, summarize, present, analyze, interpret and reach conclusions

• obtain data and then organize, summarize, present and analyze

• plan studies and experiments