Point Estimate of the Population Mean and Margin of Error

How do I calculate the point estimate of the population mean and the margin of error for a 90% confidence interval. If I were given the example of lengths of running distances for 30 people (miles), such as 12, 18, 20, 15, 6, 8, 9, 10, 2, 1, 12, 33, 20, 18, 15, 15, 6, 9, 9, 10, 10, 12, 22, 24, 6, 7, 8, 8, 9, 10.

Solution Summary

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The average expenditure on Valentine's Day was expected to be $100.89 (USA Today,| February 13, 2006). Do male and female consumers differ in the amounts they spend?
The average expenditure in a sample survey of 40 male consumers was $135.67, andthe average expenditure in a sample survey of 30 female consumers was $68.64. Ba

Confidence Intervals for Population Proportions
5.The new Twinkle bulb is being developed to last more than 1000 hours. A random sample of 100 of these new bulbs is selected from the production line. It was found that 64 lasted more than 1000 hours. Find thepointestimate for thepopulation proportion, themargin of error fo

In an effort to estimatethemean amount spent per customer for dinner at a major Atlanta restaurant, data were collected for a sample of 49 customers. Assume a population standard deviation of $5.
a. At 95% confidence, what is themargin of error?
b. If the sample mean is $24.80, what is the 95% confidence interval for th

I need help with details on the following problem:
The time it takes for a taxi to drive fro, the office to the airport was recorded on 40 occasions. It was found that x_bar = 47 minutes and s = 5 minutes. Give
a) An estimate of μ = populationmean time to drive.
b) An approximate 95.4% errormargin.
Thanks

Part A: Define (a) pointestimate, (b) interval estimate, (c) confidence interval, and (d) confidence level.
Part B: List some common confidence levels. Why not use other confidence levels? Explain.

I need help solving 95% confidence interval andpointestimate problems.
A sample of 16 people are used, each one is to keep track of their time with the following result in hours.
1.8, 1.7, 0.9, 1.1, 1.5, 1.5, 1.2, 0.6, 1.4, 0.9, 0.7, 1.8, 1.7, 2.2, 1.5, 1.3
Construct a 95% confidence interval for the amount of time n

Question:
Towers Perrin, a New York human resources consulting firm, conducted a survey of 1100 employees at medium sized and large companies to determine how dissatisfied employees were with their jobs (The Wall Street Journal, January 29, 2003). A total of 473 employees indicated they strongly disliked their current work ex

# 1. use the sample data and confidence level to construct the confidence interval estimate of thepopulation proportion p.
n= 550, x= 440, 95% confidence
< p <
#2 use the given confidence level and sample data to find (a) themargin of errorand (b) the confidence interval for thepopulationmean m. assume that t