Monday

October 20, 2014

October 20, 2014

Posted by **Joey** on Saturday, March 28, 2009 at 10:58pm.

Sample Size =

B. Repeat part the previous problem, but now with the knowledge that the population proportion is approximately 0.33.

Sample Size =

i don't understand how you can do this without the margin or error.

- statistics -
**MathGuru**, Saturday, March 28, 2009 at 11:35pmTry this formula:

n = [(z-value)^2 * p * q]/E^2

Note: n = sample size needed; .5 for p and .5 for q are used if no value is stated in the problem. E = maximum error, which is 0.032. Z-value is found using a z-table (for 95.7% confidence).

For B, use 0.33 for p and 0.67 for q.

Note: q = 1 - p

I'll let you take it from here.

- statistics -
**Amelia**, Wednesday, November 16, 2011 at 10:00pmAllen'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 σ = 0.30 gram.

Find the sample size necessary for an 80% confidence level with a maximal error of estimate E = 0.09 for the mean weights of the hummingbirds. (Round up to the nearest whole number.)

**Answer this Question**

**Related Questions**

Statistics - Determine the sample size necessary to estimate a population ...

Statistics - Find the minimum sample size that should be chosen to assure that ...

statistics - An IQ is designed so that the mean is 100 and the standard ...

statistics - What sample size is required from a very large population to ...

Statistics - An IQ test is designed so that the mean is 100 and the standard ...

Stats - 2) Find the minimum sample size that should be chosen to assure that the...

Elementary Statistics - 1) Construct a confidence interval of the population ...

Statistics - Calculate the following: a) Determine the sample size necessary to ...

Statistics #3 - The estimate of the population proportion is to be within plus ...

Statistics - Exercise 8.92 Tony's Pizza guarantees all pizza deliveries within ...