Suppose we are interested to construct a confidence interval at 95% confidence level of the mean exam score. We know that the population standard deviation is 3 points. EBM will be the largest when we take a random sample of   a. 150 scores   b. 100 scores   c. 72 scores   d. 36 scores

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Q: 15. A random sample of 100 visitors to a popular theme park spent an average of $142 on the trip…

A: SOLUTION: Given average x=142          standard deviation σ=47.5          random sample n=100

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Q: Aassume that adults have iq scores that are normally distributed with a mean of 96.1 and a standard…

A: Mean(µ) = 96.1Standard deviations (σ) = 18.2 X ~ N (µ, σ )= N(96.1,18.2)