ZuoTi.Pro
Question

How many total samples are required for a time study if Acme wishes to be within...

How many total samples are required for a time study if Acme wishes to be within 0.23 of the mean 95% of the time. The average time for the job is 3 minutes with a standard deviation sigma 0.92. Enter number studies rounded to nearest integer

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

Homework Answers

Answer #1

ANSWER::

σ = 0.92 , E = 0.23 , α = 0.05

E = zα/2 * σ/√ n

0.23 = 1.645 * 0.92/√ n

√ n = 1.5134 / 0.23

√ n  = 6.58

n = 6.582

n = 43.2964

n = 43

***please ask if you have any doubts.Happy to help you.

NOTE:: I HOPE YOUR HAPPY WITH MY ANSWER....***PLEASE SUPPORT ME WITH YOUR RATING...

***PLEASE GIVE ME "LIKE"...ITS VERY IMPORTANT FOR ME NOW....PLEASE SUPPORT ME ....THANK YOU

0 0
Add a comment
Know the answer?
Add Answer to:
How many total samples are required for a time study if Acme wishes to be within...
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. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • 1) A study of 100 professors showed that the time they spent on the average in...

    1) A study of 100 professors showed that the time they spent on the average in creating test questions was 20.0 minutes per question. The standard deviation of the population is 1. Which of the following is the 90% confidence interval for the average number of minutes it takes to create a test question? a) (18.36, 21.64) B)(19.74, 20.26) c)(19.84, 20.16) D)(19.88, 20.12) 2) 1) A previous analysis of paper boxes showed that the standard deviation of their lengths is...

  • An advertising executive wants to estimate the mean weekly amount of time consumers spend watching traditional...

    An advertising executive wants to estimate the mean weekly amount of time consumers spend watching traditional television daily. Based on previous​ studies, the standard deviation is assumed to be 22 minutes. The executive wants to​ estimate, with​ 99% confidence, the mean weekly amount of time to within ± 6 minutes. a. What sample size is​ needed? b. If​ 95% confidence is​ desired, how many consumers need to be​ selected? ​(Round up to the nearest​ integer.)

  • An efficiency expert wishes to determine the average time required to drill three holes in a...

    An efficiency expert wishes to determine the average time required to drill three holes in a metal component. How large a sample is needed to be 95 percent confident that the sample mean is within 15 seconds of the true mean? Assume it is known from previous studies that σ = 40 sec.

  • Problem 7-11 How many observations should a time study analyst plan for in an operation that has a standard deviation o...

    Problem 7-11 How many observations should a time study analyst plan for in an operation that has a standard deviation of 1.4 minutes per piece if the goal is to estimate the mean time per piece to within .3 minute with a confidence of 95.5 percent? (Do not round intermediate calculations. Round up your final answer to the next whole number.) Number of observations Problem 7-11 How many observations should a time study analyst plan for in an operation that...

  • How many observations should a time study analyst plan for in an operation that has a...

    How many observations should a time study analyst plan for in an operation that has a standard deviation of 1.8 minutes per piece if the goal is to estimate the mean time per piece to within .4 minute with a confidence of 95.5 percent? (Do not round intermediate calculations. Round up your final answer to the next whole number.)

  • A study of the time required for airplanes to land at a certain airport shows that...

    A study of the time required for airplanes to land at a certain airport shows that the mean is 280 seconds with a standard deviation of 20 seconds. (The times are NOT normally distributed.) a) Find the mean and standard deviation of the sample mean for samples of size 36 . μ ¯ x = σ ¯ x = (Write your answer as a decimal, rounded to 2 decimal places.) b) For samples of size 36 , find the percentage...

  • A study of peach trees found that the average number of peaches per tree was 525....

    A study of peach trees found that the average number of peaches per tree was 525. The standard deviation of the population is 105 peaches per tree. A scientist wishes to find the 95% confidence interval for the mean number of peaches per tree. How many trees does she need to sample to obtain an average accurate to within 10 peaches per tree? Hint: Round n up the nearest whole number.

  • A botanist wishes to estimate the typical number of seeds for a certain fruit. She samples...

    A botanist wishes to estimate the typical number of seeds for a certain fruit. She samples 42 specimens and counts the number of seeds in each. Use her sample results (mean = 79.1, standard deviation = 10.3) to find the 95% confidence interval for the number of seeds for the species. Enter your answer as an open-interval (i.e., parentheses) accurate to 3 decimal places.   95% C.I. =

  • An engineer wishes to determine the average time (in seconds) required to drill holes in some...

    An engineer wishes to determine the average time (in seconds) required to drill holes in some metal flange. Determine the required sample size to be 99% certain that the sample mean will be within 15 seconds of the true average, assuming that the standard deviation of the time is o = 30 seconds. A. 26 B. 27 C. 28 D. 29 E. none of the preceding

  • An engineer wishes to determine the average time (in seconds) required to drill holes in some...

    An engineer wishes to determine the average time (in seconds) required to drill holes in some metal flange. Determine the required sample size to be 99% certain that the sample mean will be within 15 seconds of the true average, assuming that the standard deviation of the time is o 30 seconds. A. 26 B. 27 C. 28 D. 29 E. none of the preceding

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
ADVERTISEMENT