Question
In: Statistics and Probability
An operation manager at an electronics company wants to test their amplifiers. The design engineer claims...
An operation manager at an electronics company wants to test their amplifiers. The design engineer claims they have a mean output of 113 watts with a variance of 100. What is the probability that the mean amplifier output would be greater than 112.5 watts in a sample of 43 amplifiers if the claim is true?
HOW TO SOLVE IT ON TI-84?
Solutions
Expert Solution
Step 1: Press the 2nd key and then press VARS then 2 to get “normalcdf.”
Step 2: Enter the following numbers into the
screen:
90 for the lower bound 112.5, followed by a comma, then 1e99 for
the upper bound, followed by another comma.
Step 3: Press 113 (for the mean), followed by a comma and then sqrt(100/43) (for the standard deviation).
Step 4: Close the argument list with a “)”. (Your display should now read normalcdf(112.5, 1e99, 113, sqrt(100/43)).) Now press ENTER. The calculator returns the probability, which in this case is , 0.3715 or 37.15%
orchestra answered 1 year agoRelated Solutions
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