Nominal Probability Z-Table, statistics homework help
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Read the following scenario and complete each of the four problem sets below:
A. Use the z-table to determine the following probabilities. Sketch a normal curve for each problem with the appropriate probability area shaded.
1. P(z > 2.34)
2. P(z < -1.56)
3. P(z = 1.23)
4. P(-1.82 < z < 0.79)
5. Determine the z-score that corresponds with a 67% probability.
B. Read the following scenario:
Park Rangers in a Yellowstone National Park have determined that fawns less than 6 months old have a body weight that is approximately normally distributed with a meanµ = 26.1 kg and standard deviation a = 4.2 kg. Let x be the weight of a fawn in kilograms.
Complete each of the following steps for the word problems below:
•Rewrite each of the following word problems into a probability expression, such as P(x>30).
•Convert each of the probability expressions involving x into probability expressions involving z, using the information from the scenario.
•Sketch a normal curve for each z probability expression with the appropriate probability area shaded.
•Solve the problem.
1. What is the probability of selecting a fawn less than 6 months old in Yellowstone that weighs less than 25 kilograms?
2. What is the probability of selecting a fawn less than 6 months old in Yellowstone that weighs more than 19 kilograms?
3. What is the probability of selecting a fawn less than 6 months old in Yellowstone that weighs between 30 and 38 kilograms?
4. If a fawn less than 6 months old weighs 16 pounds, would you say that it is an unusually small animal? Explain and verify your answer mathematically.
5. What is the weight of a fawn less than 6 months old that corresponds with a 20% probability of being randomly selected? Explain and verify your answer mathematically.
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