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Let the result of measurements to determine the spring constants of a sample drawn from a...

Let the result of measurements to determine the spring constants of a sample drawn from a very large number of valve springs manufactured be obtained as N = 40, x = 152.5 N/cm, s = 0.889 N/cm

a) Determine the range of spring constants with a “confidence level” of ±95 %.

b) Determine the confidence interval of the mean value with a “confidence level” of ±95 %.

c) Determine the % probability of having springs with spring constants greater than 154 N/cm.

PLEASE ANSWER URGENTLY!!!

Math   Statistics-And-Probability   
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