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1. [02510.3 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 Alther.t Suppose a small group of 11 Allen's hummingbirds has been under study in Arizona. The average weight for these birds is E = 3.15 grams. Based on previous studies, we can assume that the weights of Allen's hummingbirds have a normal distribution, with 0' = 0.36 gram. (a) Find an 80% condence 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.) lowerlimit 3.01 'f upperlimit 3.29 margin of error 0.14 q (b) What conditions are necessary for your calculations? (Select all that apply.) at normal distribution of weights uniform distribution of weights cr is known 0' is unknown n is large (c) Interpret your results in the context of this problem. . We are 80% condent that the true average weight of Allen's hummingbirds falls within this interval. We are 20% condent 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 0.20. The probability that this interval contains the true average weight of Allen's hummingbirds is 0.80. f (d) Find the sample size necessary for an 80% condence level with a maximal margin of error E = 0.1 5 for the mean weights of the hummingbirds. (Round up to the nearest whole number.) 9 x hummingbirds 3. [0.25/0.3 Points] DETAILS PREVIOUS ANSWERS BBUNDERSTAT12 7.1.015.FB. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Allen's hummingbird (Selasphorus sasin) has been studied by zoologist Bill Alther.+ Suppose a small group of 16 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 O = 0.30 gram. () 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.) lower limit 3.05 upper limit 3.24 X margin of error 0.105. [0.25I0.3 Points] DETAILS PREVIOUS ANSWERS BBUNDERSTAT12 7.1.017. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Total plasma volume is important in determining the required plasma component in blood replacement therapy for a person undergoing surgery. Plasma volume is inuenced by the overall health and physical activity of an individual. Suppose that a random sample of 47 male reghters are tested and that they have a plasma volume sample mean of x E = 37.5 ml/kg (milliliters plasma per kilogram body weight). Assume that 0' = 7.30 ml/kg for the distribution of blood plasma. (a) Find a 99% condence interval for the population mean blood plasma volume in male reghters. What is the margin of error? (Round your answers to two decimal places.) lower limit 3475 J upperlimit 40.24 4! margin of error 2.74 I J (b) What conditions are necessary for your calculations? (Select all that apply.) 0' is unknown the distribution of weights is uniform 0' is known the distribution of weights is normal n is large 3' 6. [0.18/0.3 Points] DETAILS PREVIOUS ANSWERS BBUNDERSTAT12 7.1.017.EP. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Total plasma volume is important in determining the required plasma component in blood replacement therapy for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that a random sample of 46 male firefighters are tested and that they have a plasma volume sample mean of x = 37.5 ml/kg (milliliters plasma per kilogram body weight). Assume that O = 7.90 ml/kg for the distribution of blood plasma. When finding an 99% confidence interval, what is the critical value for confidence level? (Give your answer to two decimal places.) Zo = 2.58 (a) Find a 99% confidence interval for the population mean blood plasma volume in male firefighters. What is the margin of error? (Round your answers to two decimal places.) lower limit 34.5 upper limit 40.5 margin of error 3.00 () What conditions are necessary for your calculations? (Select all that apply.) the distribution of weights is uniform is unknown tribution of weights is normal n is large is known X7. [0.2/0.3 Points] DETAILS PREVIOUS ANSWERS BBUNDERSTAT12 7.1.017.FB. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Total plasma volume is important in determining the required plasma component in blood replacement therapy for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that a random sample of 50 male firefighters are tested and that they have a plasma volume sample mean of x = 37.5 ml/kg (milliliters plasma per kilogram body weight). Assume that O = 7.90 ml/kg for the distribution of blood plasma. (a) Find a 99% confidence interval for the population mean blood plasma volume in male firefighters. What is the margin of error? (Round your answers to two decimal places.) lower limit 34.68 x upper limit 40.38 margin of error 2.88 (b) What conditions are necessary for your calculations? (Select all that apply.) the distribution of weights is uniform o is unknown n is large is known the distribution of weights is normal8. [0.25/0.3 Points] DETAILS PREVIOUS ANSWERS BBUNDERSTAT12 7.1.017.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Total plasma volume is important in determining the required plasma component in blood replacement therapy for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that a random sample of 46 male firefighters are tested and that they have a plasma volume sample mean of x = 37.5 ml/kg (milliliters plasma per kilogram body weight). Assume that O = 7.60 ml/kg for the distribution of blood plasma. (a) Find a 99% confidence interval for the population mean blood plasma volume in male firefighters. What is the margin of error? (Round your answers to two decimal places.) lower limit 34.61 upper limit 40.39 margin of error 2.89 b) What conditions are necessary for your calculations? (Select all that apply.) the distribution of weights is normal is known the distribution of weights is uniform n is large is unknown X9. [0.22/0.3 Points] DETAILS PREVIOUS ANSWERS BBUNDERSTAT12 7.1.018.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER What price do farmers get for their watermelon crops? In the third week of July, a random sample of 41 farming regions gave a sample mean of x = $6.88 per 100 pounds of watermelon. Assume that O is known to be $1.92 per 100 pounds. (a) Find a 90% confidence interval for the population mean price (per 100 pounds) that farmers in this region get for their watermelon crop. What is the margin of error? (Round your answers to two decimal places.) lower limit $ 6.38 X upper limit $ 7.37 margin of error $ 0.49 (b) Find the sample size necessary for a 90% confidence level with maximal error of estimate E = 0.39 for the mean price per 100 pounds of watermelon. (Round up to the nearest whole number.) 93 x farming regions
