7.4 – Sampling Distribution

Statistic: a numerical descriptive measure of a sample

Parameter: a numerical descriptive measure of a population.

Commonly Used…

Measure• Mean

• Variance

• Standard Deviation

• Proportion

Statisticx̅$

s2

s

p̂�

Parameterµ

ơ2

ơ

p

Inferences

Use samples (statistics) to make inferences about population (parameters)

Types of Inferences:1. Estimation: estimate value of population2. Testing: formulate a decision about the value

of population3. Regression: predictions or forecasts about

value of a statistical variable.

Sampling Distribution

Probability distribution of a sample statistic based on all possible simple random samples of the same size from the same population.

• You can use a frequency table and a histogram to show a sampling distribution.

Guided Ex̅ercise #9

• SKIP

Checkpoint

Compute the probability of “standardized events”

Find a z score from a given normal probability (inverse normal)

Use the inverse normal to solve guarantee problems

Homework

• Read Pages 280-285– Take notes on what we have not covered

• Do Problems – Page 285 (1-9) ALL• Check odds in back of book

• Read and preload 7.5 information– Notes/vocab