Allen's hummingbird (Selasphorus sasin) has been studied by zoologist Bill Alther.† Suppose a small group of 11 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 ? = 0.32 gram.
A-Find the sample size necessary for an 80% confidence level with a maximal margin of errorE = 0.08 for the mean weights of the hummingbirds. (Round up to the nearest whole number.) =__ hummingbirds
Do you want to own your own candy store? Wow! With some interest in running your own business and a decent credit rating, you can probably get a bank loan on startup costs for franchises such as Candy Express, The Fudge Company, Karmel Corn, and Rocky Mountain Chocolate Factory. Startup costs (in thousands of dollars) for a random sample of candy stores are given below. Assume that the population ofx values has an approximately normal distribution.
B-Find a 90% confidence interval for the population average startup costs ? for candy store franchises. (Round your answers to one decimal place.)
For this problem, carry at least four digits after the decimal in your calculations. Answers may vary slightly due to rounding.In a random sample of 63 professional actors, it was found that 43 were extroverts.
C-(b) Find a 95% confidence interval forp. (Round your answers to two decimal places.)
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