4. The Greater Pittsburgh Area Chamber of Commerce wants to estimate the mean time downtown workers spend complaining about the traffic. A sample of 15 workers reveals the following number of minutes spent complaining about the traffic. 29 38 38 33 41 28 45 34 40 37 37 42 30 32 35 Eber= =AVERAGE(Q27)' O = =STDEVA(D27:Q27)' Based on a 98% confidence interval, the minimum time a worker spends complaining is... =35-2.33*(4.8/3.87)"