Question

An article reports that in a sample of 123 hip surgeries of a certain type, the...

An article reports that in a sample of 123 hip surgeries of a certain type, the average surgery time was 136.9 minutes with a standard deviation of 22.9 minutes.

(A) Find a 98% lower confidence bound for the mean time. Round the answer to two decimal places.

The 98% lower confidence bound is:

(B) Someone says that the mean time is greater than 134.26 minutes. With what level of confidence can this statement be made? Express the answer as a percent and round to two decimal places

The level of confidence is: %

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
A)An article reports that in a sample of 113 people undergoing a certain type of hip...
A)An article reports that in a sample of 113 people undergoing a certain type of hip replacement surgery on one hip, 64 of them had surgery on their right hip. Can you conclude that frequency of this type of surgery differs between right and left hips? Find the P-value and state a conclusion. Round the answer to four decimal places. The P-value is? B)Lasers can provide highly accurate measurements of small movements. To determine the accuracy of such a laser,...
The technology underlying hip replacements has changed as these operations have become more popular (over 250,000...
The technology underlying hip replacements has changed as these operations have become more popular (over 250,000 in the United States in 2008). Starting in 2003, highly durable ceramic hips were marketed. Unfortunately, for too many patients the increased durability has been counterbalanced by an increased incidence of squeaking. An article reported that in one study of 142 individuals who received ceramic hips between 2003 and 2005, 8 of the hips developed squeaking. (a) Calculate a lower confidence bound at the...
An article reports that the average initial rate of absorption (in g/min·cm2) for a sample of...
An article reports that the average initial rate of absorption (in g/min·cm2) for a sample of five clay bricks with fine glass particles added was 1299.8 with a standard deviation of 329.8, and the average for another sample of fifteen bricks without glass particles added was 4500.8 with a standard deviation of 271.6. Let μX represent the population mean without glass particles and let μY represent the population mean with glass particles. Find a 98% confidence interval for the difference...
An article gave the following summary data on shear strength (kip) for a sample of 3/8-in....
An article gave the following summary data on shear strength (kip) for a sample of 3/8-in. anchor bolts: n = 71, x = 4.50, s = 1.40. Calculate a lower confidence bound using a confidence level of 90% for true average shear strength. (Round your answer to two decimal places.)
The technology underlying hip replacements has changed as these operations have become more popular (over 250,000...
The technology underlying hip replacements has changed as these operations have become more popular (over 250,000 in the United States in 2008). Starting in 2003, highly durable ceramic hips were marketed. Unfortunately, for too many patients the increased durability has been counterbalanced by an increased incidence of squeaking. An article reported that in one study of 159 individuals who received ceramic hips between 2003 and 2005, 10 of the hips developed squeaking. (a) Calculate a lower confidence bound at the...
A journal article reports that a sample of size 5 was used as a basis for...
A journal article reports that a sample of size 5 was used as a basis for calculating a 95% CI for the true average natural frequency (Hz) of delaminated beams of a certain type. The resulting interval was (229.964, 233.704). You decide that a confidence level of 99% is more appropriate than the 95% level used. What are the limits of the 99% interval? [Hint: Use the center of the interval and its width to determine x and s.] (Round...
An article gave the following summary data on shear strength (kip) for a sample of 3/8-in....
An article gave the following summary data on shear strength (kip) for a sample of 3/8-in. anchor bolts: n = 75, x = 4.50, s = 1.80. Calculate a lower confidence bound using a confidence level of 90% for true average shear strength. (Round your answer to two decimal places.) pls show work and formulas used in detail
An article reports that the average initial rate of absorption (in g/min·cm2) for a sample of...
An article reports that the average initial rate of absorption (in g/min·cm2) for a sample of five clay bricks with fine glass particles added was 1299.8 with a standard deviation of 329.8, and the average for another sample of fifteen bricks without glass particles added was 4500.8 with a standard deviation of 271.6. Let μXμX represent the population mean without glass particles and let μYμY represent the population mean with glass particles. Find a 98% confidence interval for the difference...
An article reports that the average initial rate of absorption (in g/min·cm2) for a sample of...
An article reports that the average initial rate of absorption (in g/min·cm2) for a sample of five clay bricks with fine glass particles added was 1299.8 with a standard deviation of 329.8, and the average for another sample of fifteen bricks without glass particles added was 4500.8 with a standard deviation of 271.6. Let μXμX represent the population mean without glass particles and let μYμY represent the population mean with glass particles. Find a 98% confidence interval for the difference...
The technology underlying hip replacements has changed as these operations have become more popular (over 250,000...
The technology underlying hip replacements has changed as these operations have become more popular (over 250,000 in the United States in 2008). Starting in 2003, highly durable ceramic hips were marketed. Unfortunately, for too many patients the increased durability has been counterbalanced by an increased incidence of squeaking. An article reported that in one study of 154 individuals who received ceramic hips between 2003 and 2005, 10 of the hips developed squeaking. (a) Calculate a lower confidence bound at the...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT