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A dump of our free Chat sessions, in case it is useful. It excludes white boards used during paid sessions.

tutor3 : Hello Student, May I help you with your Math problems?
student : Yes
student : A laboratory scale is known to have a standard deviation of σ = 0.011 grams in repeated weighings. Scale readings in repeated weighings are Normally distributed, with mean equal to the true weight of the specimen. A specimen is weighed 5 times on this scale. The average weight of these 5 weighings is 4.19 grams.

A 99% confidence interval for the true weight of this specimen is
student : Hello?
tutor3 : Please wait, we are helping other students
student : Hello?

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