10.74 A sample of 150 people is observed using one of four entrances to a commercial building. The data are as follows:

a Test the hypothesis that all four entrances are used equally often. Use .
b Entrances 1 and 2 are on a subway level, while entrances 3 and 4 are on ground level. Test the hypothesis that subway and ground-level entrances are used equally often, use

Transcribed Image Text:

Entrance No. of People 1 2 3 4 42 36 31 41