Question: Mean Standard Deviation N Lower class 11.36 2.96 121 Working class 12.73 2.79 676 Middle class 14.40 3.04 636 Upper class 15.49 2.95 53 The

	Mean	Standard Deviation	N
Lower class	11.36	2.96	121
Working class	12.73	2.79	676
Middle class	14.40	3.04	636
Upper class	15.49	2.95	53

The 2008 GSS provides these statistics above for the average years of education for lower-, working-, middle-, and upper-class respondents and their associated standard deviations.

As our confidence in the result increases, how does the size of the confidence interval change? Explain why this is so

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