Q #1

11. [0.17/1 Points] DETAILS PREVIOUS ANSWERS BBUNDERSTAT12 7.1.015. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Allen's hummingbird (Selasphorus sasin) has been studied by zoologist Bill Althen. Suppose a small group of 12 Allen's hummingbirds has been under study in Arizona. The average weight for these birds is x = 3.15 grams. Based on previous studies, we can assume that the weights of Allen's hummingbirds have a normal distribution, with 7 = 0.20 gram. (a) Find an 80% confidence interval for the average weights of Allen's hummingbirds in the study region. What is the margin of error? (Round your answers to two decimal places.) ower limit upper limit margin of error (b) What conditions are necessary for your calculations? (Select all that apply.) On is large O normal distribution of weights O uniform distribution of weights O o is known D o is unknown (c) Interpret your results in the context of this problem. O The probability that this interval contains the true average weight of Allen's hummingbirds is 0.20. We are 20% confident that the true average weight of Allen's hummingbirds falls within this interval. The probability that this interval contains the true average weight of Allen's hummingbirds is 0.80. We are 80% confident that the true average weight of Allen's hummingbirds falls within this interval. (d) Find the sample size necessary for an 80% confidence level with a maximal margin of error E = 0.07 for the mean weights of the hummingbirds. (Round up to the nearest whole number.) |hummingbirds Need Help? Read It Watch it12. [0.17/1 Points] DETAILS PREVIOUS ANSWERS BBUNDERSTAT12 7.1.016.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Overproduction of uric acid in the body can be an indication of cell breakdown. This may be an advance indication of illness such as gout, leukemia, or lymphoma.+ Over a period of months, an adult male patient has taken thirteen blood tests for uric acid. The mean concentration was x = 5.34 mg/dl. The distribution of uric acid in healthy adult males can be assumed to be normal, with