Презентация на тему An over view of statistics

should I study Statistics?
(C ) How can Statistics help

me in my profession?

counts, measurements, or responses.
Statistics: Is the science of collecting

, organizing, analyzing and Interpreting data in order to make a decision.
A population: is the collection of all outcomes ,responses, measurements, or counts that are of interest.
A Sample is a subset of a population.

adults in the United States were asked if they

read news on the internet at least once a week. Six hundred of the adults said Yes. Identify the population and the sample. Describe the data set.

The population consists of the responses of all the adults in the United States. And the Sample consists of the 3002 adults in the United States. The data set consists of 600 yes’s and 2402 no’s.

)
Venn Diagram
Responses of adults in the Survey
(Sample. )


600 yes’s
2402

No’s

surveys of 800 gasoline stations to determine the average

price per gallon of regular gasoline. On May 24,2001 the average price was $1.713 per gallon. Identify the population and the Sample.

of all stations in the United States.
The Sample consists

of the prices per gallon of regular gas at the 800 surveyed stations.
The data sets consists of the 800 prices.

population characteristic.
A statistic is a numerical description of a

sample characteristic.

reported that the average starting salary for an MBA

is less than $65,000.
2.) Starting salaries for the 667 MBA graduates from the University of Chicago Graduate School of Business increased 8.5% from the previous year.
3.) In a random check of retail stores The Food and Drug Administration found that 34% of the stores were not storing fish at the proper temperature.

is based on a subset of the population it

is a sample statistic.
2.)Because the numerical measure of 8.5% is based on all 667 graduates starting salaries it is a population statistic.
3.) Because the numerical measure of34% is based on a subset of the population it is a sample statistic.

spent a total of $1,968,088,814 on players salaries. Does

this numerical value represent a population parameter or a sample statistic?

a.) It is Population
b.) It is a parameter.

statistics that involves the organization ,summarization , and display

of data.
Inferential Statistics: is the branch of statistics that involves using a sample to draw conclusions about a population. A basic tool in the study of Inferential statistics is Probability.

studied for 18 years. For unmarried men 60% to

70% were alive at 65. For married men 90% were alive at 65. Which part represents descriptive Statistics? What conclusions might be drawn from this study using inferential Statistics?

Solution
Descriptive Statistics involves statements such as
For unmarried men 60% to 70% were alive at 65. For married men 90% were alive at 65
A possible inference that might be drawn from this study is that being married is associated with a longer life for men.

percent who incorrectly forecasted high-tech earnings in a recent

year was 44%.

Solution
The part of the study that represents the descriptive branch of statistics involves the statement “ The percent of Wall Street analysts who incorrectly forecasted high-tech earnings in a recent year was 44%”. A possible inference drawn from the study is that the stock market is difficult to forecast even for professionals.

slides for each section, do the Try It
Yourself

problems in your text for that section to see if
you understood the material. Then, do the assigned
problems for that section.

sure to have paper, pencil, a calculator and your

text handy. Click to advance to the slide show.

and interpreting data in order to make decisions.
What

Is Statistics?

counts that are of interest.
Sample
A portion or subset of

the population.

number that describes a sample characteristic.
Average gross income of

all
people in the United States in
2002.

2002 gross income of people
from a sample of three states.