STORY: Ball said "the jobs report is going to be a very closely scrutinized... by the Fed, by investors and and by others."
He added "I think if there is a increase in what I'm going to call the unemployment rate above 3.9%, that would be a shock. If it was below 3.4%, that would be a shock."
According to a Reuters survey of economists, nonfarm payrolls likely increased by 190,000 jobs in May after rising by 253,000 in April. The unemployment rate is seen ticking up to 3.5% from a 53-year low of 3.4% in April.