Independent random samples were selected from two binomial populations, with sample sizes and the number of successes given below. n₁ = 1,450, n₂ = 1,300, x₁ = 556, x₂ = 637 Find the best point estimate for the difference in the population proportion of successes. (Use P₁ - P₂. Round your answer to four decimal places.) Calculate the 95% margin of error. (Round your answer to four decimal places.)

I can't understand why the data is the percentage of surveyed parents.

You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 13%. You would like to be 98% confident that your estimate is within 4.5% of the true population proportion. How large of a sample size is required?

You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 10%. You would like to be 95% confident that your estimate is within 3% of the true population proportion. How large of a sample size is required? Do not round mid-calculation.

PROPORTIONS Sample Size: Calculate the sample size. A previous study showed that 69% of community college students have read a book for personal enjoyment during the school year. If a new study were to be done in order to reduce the margin of error to 1%, how many students should be sampled?

You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 69%. You would like to be 99% confident that your estimate is within 4.5% of the true population proportion. How large of a sample size is required?

A national polling agency conducted a survey based on a random sample of Americans. The poll finds that 26% of Americans approve of the job that the President is doing; the poll has a margin of error of 8% (assuming a 95% degree of confidence).   Step 3 of 3:  What was the minimum size of the sample for this poll? Round your answer up to the nearest whole number.

You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 68%. You would like to be 95% confident that your estimate is within 3.5% of the true population proportion. How large of a sample size is required? Do not round mid-calculation.

Carmen and Rosanna are two employees in an electronics store. The store manager has put an emphasis on increasing the number of applications for the store credit card. The manager randomly selected 24 weeks for each employee and recorded the number of completed applications for each week, which is provided in the samples below. Each employee completed 21 applications in one of the weeks selected. Use Excel to calculate each employee's z-score for completing 21 applications. Round your answers to two decimal places. Carmen Rosanna11 56 1115 613 185 1114 1416 521 208 1110 97 1416 1513 1310 619 2118 95 1817 310 126 1712 1214 419 1017 8

You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable estimate for the population proportion. You would like to be 99.5% confident that you esimate is within 1.5% of the true population proportion. How large of a sample size is required?