QUESTION 17 A manufacturer wants to increase the absorption capacity of a sponge. Based on past data, the average sponge could absorb 3.5 ounces.

QUESTION 17

  1. A manufacturer wants to increase the absorption capacity of a sponge. Based on past data, the average sponge could absorb 3.5 ounces. After the redesign, the absorption amounts of a sample of sponges were (in ounces): 4.1, 3.7, 3.3, 3.5, 3.8, 3.9, 3.6, 3.8, 4.0, and 3.9.  For 0.01 level of significance, what is the cut-off weight in ounces? 

I got the wrong answer: 4.44067

Degrees of freedom=9, using standard t table t=2.812 (1 tail)

xbar=3.76

Sxbar=3.76

x+/-tSx=4.44067

Help me understand my wrong answer?

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