3. If cos(x +iy) = cos a +isina, then
cos2x+cosh 2y=??
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3. If cos(x +iy) = cos a +isina, then
cos2x+cosh 2y=??A bank manager is designing a system that is intended to decrease the variance of the time customers wait before their term comes. Under old system, a random sample of 11 customers had a variance of 400. Under the new system, a random sample of 21 customers had a variance of 256. At alpha =0.05 is there enough evidence to convince the manager to switch to the new system? Assume both populations are normally distributed.Answer fast...!!
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