How many students got test scores higher than the first quartile?

How many students got test scores between the first quartile and the second quartile

• Descriptive statistics consists of methods that use sample results to help make decisions

  or predictions about a population.

• Inferential statistics utilizes sample data to make estimates, decisions, predictions, or other generalization about a population.

• Descriptive

  statistics consists of methods that help us organize, display, and describe

  data using tables, graphs, and summary measures.

• Inferential statistics utilizes numerical and graphical methods to look for patterns in a data set, to summarize the information revealed in a data set, and to present that information in a convenient form.

• The variable number

  of family members (Answer: 0, 1, 2, ...) is

• The variable income of the family (in $) is

• The variable "have

  they taken a vacation during the past year" (Answer: Yes or No) is

• Inferential statistics utilizes sample data to make estimates

  ,

  decisions, predictions, or other generalization about a population.

• Descriptive statistics utilizes numerical and graphical

  methods to look for

  patterns

  in a data set, to summarize the information

  revealed in a data set, and to

  present

  that information in a convenient

  form.

• In some cases it is impossible to identify each element of the target population.

• Conducting a census is very time consuming.

• Conducting a census is very expensive because the size of the population is often very large.

• A

  sample drawn in such a way that each member of the population has some chance

  of being selected in the sample is called a random sample.

• A

  systematic random sample is a sample in which members of a population are selected based

  on the judgment and prior knowledge of an expert.

• A

  convenience sample is a sample in which the most accessible members of the

  population are selected.