There is no readily available report that filters study statistics based on a specific device type. However, you can manually filterÂ raw data.

## Example

You want to get the study completion statistics for respondents who completed the survey on a mobile device.

## Detailed Steps

### Export the Raw Data

- Create an export.
- Add the system question
**CompletionTime**.

By default, the CompletionTime of the study is already available in the**Quick Select**section of the**Edit Questions**menu of your export. - In the export filter, add the condition: ResponseStatus is Completed AND DeviceType is Phone.
- Run the export.
- Download the file.

### Calculate the Study Completion Statistics

All completion time calculations, except median, use a formula for calculation where only values within one standard deviation of the mean are used. This is because some people will respond over a number of days, which skews the numbers.

- Calculate the Mean CompletionTime.

You could do this in Excel by using the function AVERAGE. - Calculate the Standard Deviation.

You could do this in Excel by using the function STDEV.S - Calculate One Standard Deviation from the Mean.

You just need to add the Mean CompletionTime and Standard Deviation. **Shortest Study Completion Time**is the shortest CompletionTime.**Average Study Completion Time**is the averege CompletionTime excluding values that are One Standard Deviation from the Mean.**Longest Study Completion Time**is the longest CompletionTime that is not greater than One Standard Deviation from the Mean.**Median Study Completion Time**is the median of all CompletionTime.

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