If n=150 and ˆpp^ (p-hat) =0.67, find the margin of error at a
95% confidence level
Give your answer to three decimals
Solution :
Given that,
Point estimate = sample proportion = = 0.67
1 - = 1 - 0.67 = 0.33
Z/2 = 1.96
Margin of error = E = Z / 2 * (( * (1 - )) / n)
= 1.96 * (((0.67 * 0.33) / 150)
Margin of error = E = 0.075
If n=150 and ˆpp^ (p-hat) =0.67, find the margin of error at a 95% confidence level...
If n=490 and ˆpp^ (p-hat) = 0.3, construct a 90% confidence interval. Give your answers to three decimals. < p <
If n=140 and ˆpp^ (p-hat) = 0.43, construct a 90% confidence interval. Give your answers to three decimals. < p <
If n = 360 and ˆp (p-hat) = 0.45, construct a 95% confidence interval. Give your answers to three decimals: _________ < p < ____________
1. If n=28, (x-bar)=49, and s=6, find the margin of error at a 95% confidence level. Give your answer to two decimal places. 2. In a survey, 10 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $39 and standard deviation of $8. Find the margin of error at a 90% confidence level. Give your answer to two decimal places. 3. If n=20, (x-bar)=50, and s=20, construct...
If n=29, =38, and s=2, find the margin of error at a 80% confidence level using the critical value rounded to three decimal places. Give your answer as an equation or as a number rounded to three decimal places. Preview
Assume that a sample is used to estimate a population proportion p. Find the 95% confidence interval for a sample of size 186 with 56% successes. Enter your answer as an open-interval (i.e., parentheses) using decimals (not percents) accurate to three decimal places. Confidence interval = Express the same answer as a tri-linear inequality using decimals (not percents) accurate to three decimal places. < p < Express the same answer using the point estimate and margin of error. Give your...
Use the normal distribution to find a confidence interval for a proportion p given the relevant sample results. Give the best point estimate for p , the margin of error, and the confidence interval. Assume the results come from a random sample. A 95% confidence interval for the proportion of the population in Category A given that 18% of a sample of 450 are in Category A. Round your answer for the point estimate to two decimal places, and your...
If n = 120 and ˆ p (p-hat) = 0.4, construct a 90% confidence interval. Give your answers to three decimals
If n=13, x-bar=48, and s=9, find the margin of error at a 80% confidence level Give your answer to two decimal places.
If n=11, 7(x-bar)-45, and s=7, find the margin of error at a 90% confidence level Give your answer to two decimal places.