The test statistic is Chi-square compares the frequencies provided by the sample data (observed frequencies) with the expected frequencies, and has the following calculation formula:

The expected frequency f_e= to the total of rows, by (X), the total of columns, divided (/), in the grand total.

The observed frequency f_o= the data recorded from the sample taken.

Suppose that a researcher is interested in evaluating the association between seat belt use in private vehicles and the socioeconomic status of the vehicle driver.For this purpose, a sample of drivers is taken who are classified in an association table, finding the following results:

Belt use	Low socioeconomic status	Medium socioeconomic level	High socioeconomic status	TOTAL
YES	8	fifteen	28	51
NO	13	16	14	43
TOTAL	twenty-one	31	42	94

Calculate the expected frequencies for the low level.