build_figure is expecting wrong column names

> Please provide us with the following information:
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### This issue is for a: (mark with an `x`)
```
- [ X] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)
```

### Minimal steps to reproduce
> run the notebook, try to execute build_figure(sample_data,95)
since the values returned are not in plural there are multiple errors.

### Any log messages given by the failure
> getting a KeyError when trying build the figure

for example
columns = {'expectedValues': result['expectedValue**s**'],
this is the case for : upperMargins, lowerMargins
### Expected/desired behavior
> notebook should run w/o errors

### OS and Version?
> Windows 10.

### Versions
>

### Mention any other details that might be useful
running on a notebook vm with Python 3 kernel
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