Suppose a random sample of 49 middle school students have spent in an average of 3 hours to engage in the extra curricular activities per day with a standard deviation of 0.5 hours per day. Construct a 99% confidence interval, µ, the average time spent by all the middle school students to engage in the extra curricular activities per day. [Remember: Please show graph and mark the area you have to find out in the graph. In addition, you should also show the formula to find the area.]

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A: From the provided information, The area to the left of z is 0.0250 that is P (Z<z) = 0.0250

Q: Find a z-score which separate an area of 0.9000 on the right,from the remaining area on the left

A: Find a z-score which separate an area of 0.9000 on the right , from the remaining area on the left

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