Allen's hummingbird (Selasphorus sasin) has been studied by zoologist Bill Alther.t Suppose a small group of 19 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 a= 0.40 gram. When finding an 80% confidence interval, what is the critical value for confidence level? (Give your answer to two decimal places.) (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.) lower limit upper limit margin of error (b) What conditions are necessary for your calculations? (Select all that apply.) a is unknown n is large normal distribution weights a is known n uniform distribution of weights (c) Interpret your results in the context of this problem. 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 0.20. We are 80% confident that the true average weight Allen's hummingbirds falls within this interval. The probability that this interval contains the true average weight Allen's hummingbirds is 0.80. (d) Which equation is used to find the sample size n for estimating when a is known? Find the sample size necessary for an 80% confidence level with a maximal margin of error E= 0.14 for the mean weights of the hummingbirds. (Round up to the nearest whole number.)
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.


Trending now
This is a popular solution!
Step by step
Solved in 4 steps









