Question

t is known that the mean weight of all items sent through LSUHSC's campus mail system...

t is known that the mean weight of all items sent through LSUHSC's campus mail system is 30 grams. A random sample of 25 campus mail items received by the School of Public Health had an average weight of 36 grams with a sample standard deviation of 16 grams. Construct the appropriate two-sided CI for the mean weight of mail received by the School of Public Health.

Homework Answers

Answer #1

t critical value at 0.05 level with 24 df = 2.064

95% confidence interval for is

- t * S / sqrt(n) < < + t * S / sqrt(n)

36 - 2.064 * 16 / sqrt(25) < < 36 + 2.064 * 16 / sqrt(25)

29.40 < < 42.60

95% CI is ( 29.40 , 42.60 )

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
It is known that the mean weight of all items sent through LSUHSC's campus mail system...
It is known that the mean weight of all items sent through LSUHSC's campus mail system is 30 grams. A random sample of 25 campus mail items received by the School of Public Health had an average weight of 36 grams with a sample standard deviation of 16 grams. Construct the appropriate two-sided CI for the mean weight of mail received by the School of Public Health.
It is known that the birth weight of newborn babies in the U.S. has a mean...
It is known that the birth weight of newborn babies in the U.S. has a mean of 7.1 pounds with a standard deviation of 1.5 pounds. Suppose we randomly sample 36 birth certificates from the State Health Department, and record the birth weights of these babies.    The sampling distribution of the average birth weights of random samples of 36 babies has a mean equal to ______ pounds and a standard deviation of ______ pounds. What is the probability the...
It is known that the birth weight of newborn babies in the U.S. has a mean...
It is known that the birth weight of newborn babies in the U.S. has a mean of 7.1 pounds with a standard deviation of 1.5 pounds. Suppose we randomly sample 36 birth certificates from the State Health Department, and record the birth weights of these babies. The sampling distribution of the average birth weights of random samples of 36   babies has a mean equal to ______ pounds and a standard deviation of ______ pounds. What is the probability the average...
Chapter 9 3. A sample of 25 items yields = 60 grams and s = 9...
Chapter 9 3. A sample of 25 items yields = 60 grams and s = 9 grams. Assuming a normal parent distribution, construct a 99 percent confidence interval for the population mean weight. 4. Of a random sample of 900 trucks at a bridge, 360 had bad signal lights. Construct a 99 percent confidence interval for the percentage of trucks that had bad signal lights. 5. Suppose that 80 percent of the voters in a particular region support a candidate....
We would like to determine if there is evidence that the true mean weight of all...
We would like to determine if there is evidence that the true mean weight of all polar bears in Churchill, Manitoba differs from 1000 pounds. Weights of polar bears in Churchill are known to follow a normal distribution with standard deviation 180 pounds. The mean weight of a random sample of 25 polar bears is calculated to be 1057 pounds. What is the P-value of the appropriate test of significance? Report your answer to 4 decimal places.
Q1) Suppose a production line operates with a mean filling weight of 16 ounces per container....
Q1) Suppose a production line operates with a mean filling weight of 16 ounces per container. Since over- or under-filling can be dangerous, a quality control inspector samples of 24 items to determine whether the filling weight must be adjusted. The sample revealed a mean of 16.32 ounces with a sample standard deviation of 0.8 ounces. Using a 0.10 level of significance, can it be concluded that the process is out of control (not equal to 16 ounces)? Q2) A...
The mean waiting time at the​ drive-through of a​ fast-food restaurant from the time an order...
The mean waiting time at the​ drive-through of a​ fast-food restaurant from the time an order is placed to the time the order is received is 85.8 seconds. A manager devises a new​drive-through system that he believes will decrease wait time. As a​ test, he initiates the new system at his restaurant and measures the wait time for 10 randomly selected orders. The wait times are provided in the table to the right. Complete parts​ (a) and​ (b) below. 101.1...
According to MessageLabs Ltd., 80% of all email sent in July 2010 was spam. A system...
According to MessageLabs Ltd., 80% of all email sent in July 2010 was spam. A system manager at a large corporation believes that the percentage at his company may be greater than 80%, and he wants to do a hypothesis test to see if there is evidence to support his belief. He examines a random sample of 500 emails received at an email server and finds that 420 of the messages are spam. What is the parameter for this hypothesis...
The mean waiting time at the​ drive-through of a​ fast-food restaurant from the time an order...
The mean waiting time at the​ drive-through of a​ fast-food restaurant from the time an order is placed to the time the order is received is 87.9 seconds. A manager devises a new​ drive-through system that he believes will decrease wait time. As a​ test, he initiates the new system at his restaurant and measures the wait time for 10 randomly selected orders. The wait times are provided in the table to the right. Complete parts​ (a) and​ (b) below....
The mean waiting time at the​ drive-through of a​ fast-food restaurant from the time an order...
The mean waiting time at the​ drive-through of a​ fast-food restaurant from the time an order is placed to the time the order is received is 85.3 seconds. A manager devises a new​ drive-through system that she she believes will decrease wait time. As a​ test, she she initiates the new system at her her restaurant and measures the wait time for 10 randomly selected orders. The wait times are provided in the table to the right. Complete parts​ (a)...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT