Under what circumstances is a bar graph used? When the data are on a nominal or ordinal scale When the data are on an interval or ratio scale When the data are on an ordinal or interval scale O When the data are on a ratio or nominal scale Under what circumstances is a histogram used? When the data are on an interval or ratio scale When the data are on a nominal or ordinal scale When the data are on an ordinal or interval scale When the data are on a ratio or nominal scale