When you make Excel charts in Office 2011 for Mac, you find a brand-new set of Chart tabs on the Ribbon that guide you with the latest Microsoft charting technology. Excel 2011 for Mac offers real power in its chart-analysis tools, but using them requires some knowledge of the math behind the features.

• Data Analysis Excel Mac 2011 Software Free

Adding a trendline to charts in Excel 2011 for Mac

Excel 2011 for Mac offers real power in its chart-analysis tools, but using them requires some knowledge of the math behind the features. Adding a trendline to charts in Excel 2011 for Mac Excel can add a line called a trendline that calculates and projects the trends into the past or future indicated by your data.

Excel can add a line called a trendline that calculates and projects the trends into the past or future indicated by your data.

Used improperly, a trendline can present a false picture of what’s going on with your data, so make sure you and your audience are clear about the calculation choices you made to produce your trendline.

It’s best to start with a line or bar chart. Not all chart types support trendlines. Using a single data series makes your chart much easier to understand. To add a trendline, choose the Trendline option from the Chart Layout tab of the Ribbon. This brings up the Trendline gallery with options to choose from.

Adding drop lines and high-low lines to charts in Excel 2011 for Mac

Two special kinds of lines can be added to your line chart: drop-lines and high-low lines.

On the Ribbon’s Chart Layout tab, go to the Analysis group and choose Lines→Drop Lines to add lines from your data points to the X-axis.

Hi-low lines connect the highest value and lowest value of each data point with a line. In the Chart Layout tab’s Analysis group, choose Lines→High-Low Lines to add these.

Adding up-down bars to charts in Excel 2011 for Mac

Up-down bars automatically highlight the differences between the topmost and second topmost values of your chart. On the Ribbon’s Chart Layout tab, go to the Analysis group and click Up/Down Bars to turn these on or off. Double-click one of the bars to display the Format Up Bars dialog, where you can customize these bars.

Adding Error Bars to charts in Excel 2011 for Mac

In the Chart Layout tab’s Analysis group, click Error Bars to display a pop-up menu where you can choose from standard error, percentage, or standard deviation to add error bars.

Double-click an error bar to display the Format Error Bars dialog. You can format your error bars in this dialog. You can specify custom error values by clicking the Specify Value button and choosing cells.

The Excel Data Analysis add-in provides three tools for working with t-values and t-tests, which can be very useful when you want to make inferences about very small data sets:

• t-Test: Paired Two Sample for Means

• t-Test: Two-Sample Assuming Equal Variances

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Briefly, here’s how these three tools work. For sake of illustration, assume that you’re working with these values. The worksheet range A1:A21 contains the first set of values. The worksheet range B1:B21 contains the second set of values.

To perform a t-test calculation, follow these steps:

Data Analysis Excel Mac 2011 Software Free

1. Choose Data tab’s Data Analysis.

2. When Excel displays the Data Analysis dialog box, select the appropriate t-test tool from its Analysis Tools list.

   • t-Test: Paired Two-Sample For Means: Choose this tool when you want to perform a paired two-sample t-test.

   • t-Test: Two-Sample Assuming Equal Variances: Choose this tool when you want to perform a two-sample test and you have reason to assume the means of both samples equal each other.

   • t-Test: Two-Sample Assuming Unequal Variances: Choose this tool when you want to perform a two-sample test but you assume that the two-sample variances are unequal.

3. After you select the correct t-test tool, click OK.

   Excel then displays the appropriate t-test dialog box. Here’s the t-Test: Paired Two Sample Assuming Equal Variances dialog box.

   The other t-test dialog boxes look very similar.

4. In the Variable 1 Range and Variable 2 Range input text boxes, identify the sample values by telling Excel in what worksheet ranges you’ve stored the two samples.

   You can enter a range address into these text boxes. Or you can click in the text box and then select a range by clicking and dragging. If the first cell in the variable range holds a label and you include the label in your range selection, of course, select the Labels check box.

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5. Use the Hypothesized Mean Difference text box to indicate whether you hypothesize that the means are equal.

   If you think the means of the samples are equal, enter 0 (zero) into this text box. If you hypothesize that the means are not equal, enter the mean difference.

6. In the Alpha text box, state the confidence level for your t-test calculation.

   The confidence level is between 0 and 1. By default, the confidence level is equal to 0.05, which is equivalent to a 5-percent confidence level.

7. In the Output Options section, indicate where the t-test tool results should be stored.

   Select one of the radio buttons and enter information in the text boxes to specify where Excel should place the results of the t-test analysis. For example, to place the t-test results into a range in the existing worksheet, select the Output Range radio button, and then identify the range address. If you want to place the t-test results elsewhere, select one of the other option radio buttons.

8. Click OK.

   Excel calculates the t-test results. Check out the t-test results for a Paired Two Sample Assuming Equal Variances test. The t-test results show the mean for each of the data sets, the variance, the number of observations, the pooled variance value, the hypothesized mean difference, the degrees of freedom (abbreviated as df), the t-value (or t-stat), and the probability values for one-tail and two-tail tests.