stat help

calccrypto 02 Mar 2010 04:02

can someone explain the basics of confidence interval? im completely lost on it.

is this a correct explanation of **"**the margin of error is ^{+}/-4%**"**?: the poll's result is expected to be within 4% of the actual population parameter

and what does this mean? (from here)

```
A 90% confidence level means that we would expect 90% of the interval estimates to include the population parameter;
A 95% confidence level means that 95% of the intervals would include the parameter; and so on.
```

i dont get it, since the population parameter is just 1 value. if i say 95% CI is 80%

^{+}/-5%, i think of it as being one point on a number line from 75% to 85%

however, it also says on the site:

```
Consider the following confidence interval: We are 90% confident that the population mean is greater than 100 and less than 200.
Some people think this means there is a 90% chance that the population mean falls between 100 and 200. This is incorrect.
```

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