Question 1
A population proportion is to be estimated. Estimate the minimum sample size needed to achieve the specified margin of error with a 95% degree of confidence.
A researcher wishes to estimate the proportion of children in a certain neighborhood who are living with only one parent. She wishes to achieve a margin of error of E = 0.021. What is the minimum sample size needed?
◦ 2268
◦ 48
◦ 1134
◦ 4536
Question 2
In a poll of 278 voters in a certain city, 65% said that they backed a bill which would limit growth and development in their city. The margin of error in the poll was reported as 6 percentage points (with a 95% degree of confidence). Which statement is correct?
◦ There is not enough information to determine whether the margin of error is consistent with the sample size.
◦ The sample size is too small to achieve the stated margin of error.
◦ The reported margin of error is consistent with the sample size.
◦ For the given sample size, the margin of error should be smaller than stated.
Three zones of root growth.
Growth of yeast cells in culture fits the logistic growth model.
Interstitial growth of cartilage
Working and Living and Playing in the City Dump of Phnom Penh, Cambodia
World Population Growth
Stock Market Tracks Growth in GDP