Question

An inspector needs an estimate of the mean weight of trucks crossing a bridge. She selects...

An inspector needs an estimate of the mean weight of trucks crossing a bridge. She selects a random sample of 25 trucks and finds a mean of 16 tons with a sample standard deviation of 2 tons. find the 95 percent confidence interval for the population mean.
Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
The weight of trucks traveling on a particular section of I-475 has a population mean of...
The weight of trucks traveling on a particular section of I-475 has a population mean of 15.8 tons and a population standard deviation of 4.2 tons. a-       What is the probability a state highway inspector could select a sample of 49 trucks and find the sample mean to be 14.3 tons or less? b-       What is the probability a state highway inspector could select a sample of 64 trucks and find the sample mean to be 14.3 tons or more?
You wanted to estimate the mean number of vehicles crossing a busy bridge in your neighborhood...
You wanted to estimate the mean number of vehicles crossing a busy bridge in your neighborhood each morning during rush hour for the past year. To accomplish this, you stationed yourself and a few assistants at one end of the bridge on 17 randomly selected mornings during the year and counted the number of vehicles crossing the bridge in a 10-minute period during rush hour. You found the mean to be 109 vehicles per minute, with a standard deviation of...
An agronomist wanted to estimate the mean weight of a certain fruit (?) in his farm....
An agronomist wanted to estimate the mean weight of a certain fruit (?) in his farm. He selected a random sample of size ?=16, and found that the sample mean ?̅=55 gm and a sample stranded deviation ?= 3 gm. It is assumed that the population is normal with unknown standard deviation (?). a) Find a point estimate for (?). b) Find a 95% confidence interval for the population mean (?).
An Army official wants to estimate the mean weight of a particular type of weapon. He...
An Army official wants to estimate the mean weight of a particular type of weapon. He takes a random sample of 100 weapons of this type and finds the sample mean is 48.1 lbs. and from the past military records he knows the population standard deviation is 0.12 lbs. Calculate a 98 percent confidence interval for the population mean.
Please, complete the following exercises: 1. A Quality Control inspector wants to estimate the true population...
Please, complete the following exercises: 1. A Quality Control inspector wants to estimate the true population mean for the diameter of an extruded plastic rod. She samples 65 rods. The mean diameter is 2.18 inches. From previous work, the population standard deviation is known to be 0.2 inches. Find a 95% confidence interval for the true mean diameter of all plastic rods. 2.You work in Human Resources at Merrill Lynch. You plan to survey employees to find their average medical...
A manager in a production line of cereal wants to estimate the mean weight of the...
A manager in a production line of cereal wants to estimate the mean weight of the boxes of cereal produced under his supervision. He randomly selects a sample of 28 boxes and finds that the sample mean xbar = 12.07 ounces and sample standard deviation s = 0.23ounces . (a) What is the population? What is the sample? (b) What is the population mean with 90% confidence?
The owner of a factory wants to estimate the mean cost of manufacturing a product. She...
The owner of a factory wants to estimate the mean cost of manufacturing a product. She takes a random sample of 36 products and finds the sample mean cost to be $90. Suppose the population standard deviation is known to be σ = $10. A) Create a 90% confidence interval for the population mean. B) Interpret your confidence interval from part (a). C) Without calculating another confidence interval, if the sample of 36 products instead had a mean of $200,...
Monica wants to estimate the mean number of steaksthat restaurant visitors orderduring a typical week. She...
Monica wants to estimate the mean number of steaksthat restaurant visitors orderduring a typical week. She checks the sales record for a random sample of 16 weeks and finds the mean number of steaks sold is 130 steaks per week; the sample standard deviation is 12 steaks. With 95% of confidence, estimate the mean number of steaks soldduring a typical week.State all assumptions that you used.
You want to estimate the mean weight of quarters in circulation. A sample of 50 quarters...
You want to estimate the mean weight of quarters in circulation. A sample of 50 quarters has a mean weight of 5.638 grams and a standard deviation of 0.066 gram. Use a single value to estimate the mean weight of all quarters Also find the 95% confidence interval for the average weight of all quarters. The estimate for the mean of all quarters is__grams (Round to three deci,al as needed) Find the 95% confidence interval for the mean weight of...
Suppose that a dean of a private school wants to estimate the mean IQ of her...
Suppose that a dean of a private school wants to estimate the mean IQ of her student body without having to go through the time and expense of administering the tests to all 1,000 students. Instead, she selects 25 students at random and gives them the test. She finds that the mean for her sample is 105. Calculate the 95% confidence interval. Show steps please
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT