test_results = df_hv[df_hv.group == 'test'].purchase_count
control_results = df_hv[df_hv.group == 'control'].purchase_count

hist_data = [test_results, control_results]

group_labels = ['test', 'control']

# Create distplot with curve_type set to 'normal'
fig = ff.create_distplot(hist_data, group_labels, bin_size=.5,
                         curve_type='normal',show_rug=False)

fig.layout = go.Layout(
        title='High Value Customers Test vs Control',
        plot_bgcolor  = 'rgb(243,243,243)',
        paper_bgcolor  = 'rgb(243,243,243)',
    )


# Plot!
pyoff.iplot(fig)