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- A better way to understand Standard normal distributionAge - X Number of meal in a day - Y Frequency of snack in a day - Z. Can we conclude that X, Y and Z follow a normal distribution? Why?the average IQ of an adult is 100 A research phychologist devised a course to improve IQ's a group of 10 ramdomly cholsen adults took the course and at the end of the course their IQ's were measured. The average IQ score for the class was ramdom sample=110.9. Let x be a ramdom variable that represents the IQ score of an adult who takes the course you may assume that x has a normal distribution with standard deviation=15 does the above sample result provide convincing evidence that adults who take the course have a mean IQ score greater than 100? use level 1% level of significance.
- Determine the area under the standard normal curve that lies to the right of (a) Z= - 0.27, (b) Z= - 0.68, (c) Z = 0.11, and (d) Z= – 1.16. Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). Standard normal distribution kable (page 2) (a) The area to the right of Z= - 0.27 is (Round to four decimal places as needed.) Area Standard Nornal Distribution 0.05 0.00 0.01 0.02 0.03 0.04 0.06 0.07 0.08 0.09 0.5000 0.5398 0.5793 0.6179 0.6554 0.5040 0.5438 0.5832 0.5080 0.5478 0.5871 0.6255 0.6628 05120 0.5517 0.5910 0.6293 0.6664 0.5160 0.5557 0.5948 0.5199 0.5596 0.5987 0.5239 0.5636 0.6026 0.6406 0.6772 0.5279 0.5675 0.6064 0.6443 0.6808 0.5319 0.5714 0.6103 0.5359 0.5753 0.6141 0.0 0.1 0.2 0.3 0.4 0.6217 0.6591 0.6331 0.6700 0.6368 0.6736 0.6480 0.6844 0.6517 0.6879 0.7190 0.7517 0.7823 0.7224 0.5 0.6 0.7 0.6915 0.7257 0.7580 0.7881 0.8159 0.6950 0.7291 0.7611 0.7910 0.8186 0.6985 0.7324 0.7642 0.7019…isn't it should use the normal table to find z value?What are the characteristics of a normal distribution? What two characteristics make a distribution go from “normal" to "standard normal?"
