A certain type of thread is manufactured with a mean tensile strength of 71.8 kilograms and a standard deviation of 5.6 kilograms. How is the variance of the sample nean changed when the sample size is a) increased from 49 to 256? b) decreased from 196 to 64? a) The sample variance from Type integers or decimals. Do not round.) b) The sample variance from Type integers or decimals. Do not round.) for n = 49 to for n = 196 to for n=256. for n = 64.

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