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a firm's management thinks, sales have increased now average over 50 per month 1) the distribution is known to be normal 2) = 10 is known 3) N= 49 4)...

a firm's management thinks, sales have increased now average over £50 per month

1) the distribution is known to be normal

2) σ = 10 is known

3) N= 49

4) sample mean= 53.1

Test claim at the 10% significance (alpha = .10)(α=.10)

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