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 error E = 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 of x values has an approximately normal distribution. 93 171 133 99 75 94 116 100 85 B-Find a 90% confidence interval for the population average startup costs ? for candy store franchises. (Round your answers to one decimal place.) lower limit =__ thousand dollars upper limit =__thousand dollars 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 for p. (Round your answers to two decimal places.) lower limit =__ upper limit =__
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
A-Find the
=__ 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 of x values has an approximately normal distribution.
| 93 | 171 | 133 | 99 | 75 | 94 | 116 | 100 | 85 |
B-Find a 90% confidence interval for the population average startup costs ? for candy store franchises. (Round your answers to one decimal place.)
| lower limit | =__ thousand dollars |
| upper limit | =__thousand dollars |
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 for p. (Round your answers to two decimal places.)
| lower limit | =__ |
| upper limit | =__ |
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