HomeworkLib
Question

Stat

wants to stimate the standard deviation of the time takes a bus to travel between two steps in a chy .  To develop an estimate for the standard deviation , the city has collected a random sample of the times required for 19 trips The sample standard deviation is 5.9minutes Based on these data what is the 90% conlidence interval estimate for the true population standard deviation les ses  minutes Round to two decimal places as needed )

Business-Statistics   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Request Professional Answer

Request Answer!

We need at least 10 more requests to produce the answer.

0 / 10 have requested this problem solution

The more requests, the faster the answer.

Request! (Login Required)

All students who have requested the answer will be notified once they are available.
Know the answer?
Add Answer to:
Stat
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

Similar Homework Help Questions

  • Becky Sharp is trying to create an estimate for the amount of time a carriage ride...

    Becky Sharp is trying to create an estimate for the amount of time a carriage ride from Brighton to the city of London takes. She asks her friends and acquaintances to record the time spent traveling if they make the trip during the month of June. Out of the 85 trips, She finds a mean travel time of 660 minutes, with a standard deviation of 80 minutes. a. Are there any issues with creating a confidence interval if our population...

  • The commute times for workers in a city are normally distributed with an unknown population mean...

    The commute times for workers in a city are normally distributed with an unknown population mean and standard deviation. If a random sample of 37 workers is taken and results in a sample mean of 31 minutes and sample standard deviation of 5 minutes. Use Excel to find a 95% confidence interval estimate for the population mean using the Student's t-distribution. Round the final answers to two decimal places.

  • A medical researcher wants to investigate the amount of time it takes for patients' headache pain...

    A medical researcher wants to investigate the amount of time it takes for patients' headache pain to be relieved after taking a new prescription painkiller. She plans to use statistical methods to estimate the mean of the population of relief times. She believes that the population is normally distributed with a standard deviation of 19 minutes. How large a sample should she take to estimate the mean time to within 5 minutes with 92% confidence? Sample size=

  • a)A sample of 30 patients in a doctor's office showed that they had to wait for...

    a)A sample of 30 patients in a doctor's office showed that they had to wait for an average of 33 minutes before they could see the doctor. The sample standard deviation is 14 minutes. Assume the population of waiting times is normally distributed.At 90% confidence, compute the lower bound of interval estimate for the average waiting time of all the patients who visit this doctor. b)A university planner wants to determine the proportion of spring semester students who will attend...

  • Suppose that pizza delivery times are normally distributed with a population standard deviation of 6 minutes....

    Suppose that pizza delivery times are normally distributed with a population standard deviation of 6 minutes. A random sample of 50 pizza delivery restaurants is taken and has a sample mean delivery time of 36 minutes. Construct a 90% confidence interval for the population mean delivery time. What is the sample mean? 6 1.87 36 1.64 What is the sample size? 8.33 90 50 36 What is the population standard deviation? 0.85 50 36 6 What is the confidence level?...

  • A sociologist wants to know the average number of times US families eat their evening meal...

    A sociologist wants to know the average number of times US families eat their evening meal at home together each week.  Data was collected from 50 random families.  The sample mean is 3.8 meals per week with a sample standard deviation of 2.5.  Construct a 95% confidence interval to estimate the population mean.  Then, state this interval below within an interpretive sentence tied to the given context. Redo #19, only this time assume the value $2.5 is the population standard deviation.  Then, state this interval...

  • A restaurant that delivers pizza wants to study its delivery time performance. The manager collects a...

    A restaurant that delivers pizza wants to study its delivery time performance. The manager collects a sample of 100 deliveries and finds a 90% confidence interval for delivery times to be 24–29 minutes. Assuming that the population standard deviation was used in calculating the confidence interval, what is this standard deviation?

  • 6) A medical researcher wants to investigate the amount of time it takes for patients' headache...

    6) A medical researcher wants to investigate the amount of time it takes for patients' headache to be relieved after taking a new prescription painkiller. She plans to use statistical methods to estimate the mean of the population of relief times. She believes that the population is normally distributed with a standard deviation of 20 minutes. How large a sample should she take to estimate the mean time to within 1 minute with 90% confidence? Page 2 of 2

  • Suppose a random sample of 13 items produces a sample standard deviation of 16. a. Use...

    Suppose a random sample of 13 items produces a sample standard deviation of 16. a. Use the sample results to develop a 90% confidence interval estimate for the population variance. b. Use the sample results to develop a 95% confidence interval estimate for the population variance. (Round to two decimal places as needed.) b. so2s (Round to two decimal places as needed.)

  • Traveling between two campuses of a university in a city via shuttle bus takes, on average,...

    Traveling between two campuses of a university in a city via shuttle bus takes, on average, 28 minutes with a standard deviation of 5 minutes. In a given week, a bus transported passengers 40 times. What is the probability that the average transport time was less than 30 minutes?

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT