When you add a chart to a slide, PowerPoint will automatically open an Excel window so you can enter the data to be applied to the chart.

To Add a Chart to a Slide:

• Choose the slide to which you would like to add a chart.
• Choose the Insert Chart icon that appears on the slide.  If there is no Insert Chart icon on the slide, choose Insert tab on your Ribbon.  Choose the Chart option.  This will open an Insert Chart dialog box.
• Decide on the chart category.
• Choose a chart type and choose OK.  This will open an Excel window.
• Type in data that you would like to illustrate with your chart.  When you have finished inputting the data, choose Close to exit the Excel window.