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Physics Help

A heat pump is used to keep a house warm at 22 degrees Celsius.   (a) How much work is required of the pump to deliver 2900 J of heat into the house if the outdoor temperature is 0 degrees...

Which of the following?

Which of the following is the sum of the series pi^n/e^(2n) from n=0 to infinity?    a) e/(e-pi) b) pi/(pi-e) c) pi/(pi-e^2) d) e^2/(e^2-pi) e) The series diverges...

Statistics Question

If a specimen is weighed 8 times on a scale.  σ = 0.001.  The average weight is 4.1602 grams.  A 99% confidence interval for the true weight of this specimen would be?

Statistic question?

If we have an SRS of 1600 students and the sample mean = 148.  Compare with an SRS of 900 students with the margin of error for a 95% confidence interval of µ is ?  the answer should be...

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