# How to calculate margin of error on ti 84

## Open the calculator.

To calculate the margin of error on a TI 84 calculator, first open the calculator. Then, press the “2nd” button and scroll down to ” STAT.” Next, press “ENTER.” Now, scroll to “CALC” and press “1: margin.” Finally, input the necessary information into the calculator.

## Enter the data.

First, enter your data into a list. To do this, press “STAT” and then scroll over to “EDIT.” Push “ENTER” once you have highlighted your data. Next, press “2nd” and then the “LIST” button in order to scroll through your lists of data. After you have chosen the list with your data, press “STAT” again and choose “CALC.” Select option number four, which is 1-Var Stats. Push “ENTER” after highlighting this option. Your screen should now show the mean and standard deviation for your data set.

## Press “2nd” then “Vars.”

Once you have your data set entered into the list, press “2nd” then “Vars.” Scroll down to “5:Stats.” Enter your data list name (for example, L1) and press “enter.” Scroll down to “8:MarginErr.” Press “enter” and then input your confidence level.

## Scroll to the “Statistics” menu.

To find the margin of error on a TI-84 calculator, first scroll to the “Statistics” menu. Then, select “Calculate.” Next, choose “1:margins.” Finally, select the appropriate statistic (mean, standard deviation, or proportion) and input the necessary values.

## Highlight “1-Var Stats.”

Enter your data into lists in your calculator. To do this, press the “STAT” button, then press “1” (the number one) to enter the first list. Enter your data values, separating them by commas. For example, if you collected data on the heights of six people in your class, you would enter them as such:

45,52,48,50,56,54

After you have entered all of your data points, press the “ENTER” button.

## Enter the data.

To calculate the margin of error on a TI-84 calculator, enter the data into a list. To do this, Press STAT, scroll to the right using the arrow keys, and select 1:Edit. Type in your data and press ENTER after each piece of data. When you are finished, press ENTER twice.

## Press “2nd” then “Vars.”

There are four steps to calculating the margin of error for a confidence interval:

1. Find the population mean and standard deviation.
2. Find the sample size.
3. Find the z-score associated with your level of confidence.
4. Use the formula to calculate the margin of error.

In the “Statistics” menu, scroll to the “Calc” sub-menu. In the “Calc” sub-menu, select “1-Var Stats.” Enter your data into the List1 field on the calculator. After your data has been entered, press the green “ENTER” key.

## Highlight “LinReg(a+bx).”

1. Press [STAT] to access the Stat Menu.
2. Use the arrow keys to highlight “LinReg(a+bx),” and press [ENTER].
3. Enter your data into a list by pressing [STAT] and selecting “1:Edit.” For instance, if you’re trying to find the margin of error for the following set of data:

5, 10, 15, 20, 25

you would enter it like this: {5 10 15 20 25}

1. Press [2nd][QUIT] to exit the Stat Menu.
Enter the data.
Assuming you have a set of data in L1 and L2, -Enter the data in L1 and L2. -Press 2nd, then STAT (the key that has DATA on it), then arrow over to EDIT -Arrow up or down to highlight the data you want to include in the calculations, then press ENTER -Press 2nd, then STAT (the key that has DATA on it), then arrow over to TESTS -Arrow over to 06:TInterval -Arrow over to 1:confidence level and type in the confidence level you want, then press ENTER -For sample size, type in n2-n1+1 and press ENTER (for example, if your data set starts at L1:5 and goes through L1:15, n1 would be 5 and n2 would be 15, so you would type in 11)
Highlight “Calc.”

To calculate the margin of error on a TI-84 calculator, first make sure that the “Calc” or “Calculate” function is highlighted. Then, press the “2nd” button and the “.” button to access the “MENU” function. Scroll down until the “MATH” option is highlighted, and then press enter. From there, scroll down to the “Stats” option and press enter again. Finally, scroll down to the “1-Var Stats” option and press enter once more. At this point, you should see a screen that looks like this:

Next, input your data into the calculator. For this example, we will use a sample size of 100 with a mean of 500 and a standard deviation of 100. To input this data, first press the “clear” button to clear any previous data that may be on the screen. Then, input your data by pressing the number buttons in order. So, for our example data, you would press 5-0-0 (mean), 1-0-0 (standard deviation), and 1-0-0 (sample size). Once you have inputted your data, press the enter button.

Now that your data is entered, you can calculate the margin of error by pressing the 2nd button and then selecting the “Calc” or “Calculate” function. Scroll down until you see the option for “Margin of Error.” Once you have selected this option, Press enter and your calculated margin of error will appear on the screen. In our example, we would get a margin of error of 10.

## Scroll to the “Statistics” menu.

Open the “Statistics” menu. Scroll to the “margin of error” option. Select the “calculate” option. Enter the sample size and number of successes or failures. The margin of error will be displayed.

## Highlight “Calc.”

Select the “Calc” feature on your TI-84 calculator to compute the margin of error for a given population mean. The “Calc” function is located on the left side of your calculator, under the “MODE” section. Press “2” to select the “Tests” option, then press “2” again to select the “ZInterval” option.

## Highlight “Margin of Error.”

press 2nd VARS looks like an upside down U, scroll over to highlight “Tests” and press ENTER. Highlight “1-Var Stats” and press ENTER. Type in the data you want analyzed and press ENTER. Highlight “Calc” and press ENTER. Highlight “Demo” and press ENTER. Highlight the option that best describes your data (usually “1: Use data from L1”) and press ENTER. The screen should now say:

Ans: [statistic]
Do you want to calculate anything else with this data set?

Highlight No and press ENTER twice to return to the home screen

## Enter the data.

To calculate the margin of error, we need to find the critical value and degree of freedom. The critical value is either 1.96 or 2.58 for a 95% confidence level. The degree of freedom, df, is equal to n-1, where n = the number of samples.

In this example, we have 10 samples, so df = 10-1 = 9.

We can now plug these values into the margin of error equation:

margin of error = critical value * standard deviation / sqrt(degree of freedom)

Plugging in the:
Critical value: 2.58
Standard deviation: 3.2
Degree of freedom: 9

We get: margin of error = 2.58 * 3.2 / sqrt(9) = 0.75

Therefore, the margin of error for this poll is plus or minus 0.75 percentage points with a 95% confidence level