ZuoTi.Pro
Question

Two surveys are taken. One estimates the mean number of shots it takes to complete a...

Two surveys are taken. One estimates the mean number of shots it takes to complete a golf course is 85, while the other suggests it is 94. Assume the population is normally distributed.

(a) Suppose the first survey had 15 subjects, a mean of 85, and a sample standard deviation of 6 shots. Find the 99% confidence interval for the true mean using this survey.

(b) Suppose the second survey had 21 subjects, a mean of 94, and a sample standard deviation of 9 shots. Find the 99% confidence interval for the true mean using this survey.

(c) Let's assume these two surveys are truly random and are not influenced by weather conditions or other confounding variables. What should we look for in data of the second sample to try to explain the difference in the means? [Hint: one word or one sentence]

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

0 0
Add a comment
Know the answer?
Add Answer to:
Two surveys are taken. One estimates the mean number of shots it takes to complete a...
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

  • One hundred subjects in a psychological study had a mean score of 36 on a test...

    One hundred subjects in a psychological study had a mean score of 36 on a test instrument designed to measure anger. The standard deviation of the 150 scores was 12. Find a 95% confidence interval for the mean anger score of the populations from which the sample was selected. Select one: a. (32.7, 39.3) b. (33.2, 38.8) c. (32.1, 39.9) d. None of other answer is necessary true.

  • you are amazinggg !! thanks for the help im advance At least one of the answers...

    you are amazinggg !! thanks for the help im advance At least one of the answers above is NOT correct. 14 of the questions remain unanswered. (1 point) Use the following information for all parts of this problem. On a particular golf course, a sample of 46 golfers have a mean golf score of 94. Suppose the population standard deviation for this course is 6.46. - Part 1: Using the formula a 90% confidence interval as presented in lecture, fill...

  • A) Sample of size 15 is taken from among a population of egrets and used to...

    A) Sample of size 15 is taken from among a population of egrets and used to calculate a 99% confidence interval for the true average wingspan in the population. Suppose the sample standard deviation is calculated to be s =6.2. What is the margin of error for the confidence interval? Round your answer to 3 decimal places. B) Suppose you are asked to construct a 99% confidence interval for an unknown population mean μ. The population standard deviation is unknown...

  • Suppose a survey of 36 people determined that the sample mean time spent on the internet...

    Suppose a survey of 36 people determined that the sample mean time spent on the internet was 8.2 hours with a sample standard deviation of 9.8 hours. What is the critical value for a 95% confidence interval? Note: Enter X.XX AT LEAST ONE DIGIT BEFORE THE DECIMAL, TWO AFTER and round up. Thus, 7 is entered as 7.00, 3.5 is entered as 3.50, 0.3750 is entered as 0.38 | | Suppose a survey of 36 people determined that the sample...

  • A sample of 49 observations is taken from a normal population with a standard deviation of 10. The sample mean is 55.

    A sample of 49 observations is taken from a normal population with a standard deviation of 10. The sample mean is 55. Determine the 99% confidence interval for the population mean. (Round your answers to 2 decimal places.) Confidence interval for the population mean is _______ and _______ .A research firm conducted a survey to determine the mean amount Americans spend on coffee during a week. They found the distribution of weekly spending followed the normal distribution with a population standard deviation...

  • Question 13 options: Suppose a survey of 36 people determined that the sample mean time spent...

    Question 13 options: Suppose a survey of 36 people determined that the sample mean time spent on the internet was 8.2 hours with a sample standard deviation of 9.8 hours. What is the critical value for a 95% confidence interval? Note: Enter X.XX AT LEAST ONE DIGIT BEFORE THE DECIMAL, TWO AFTER and round up. Thus, 7 is entered as 7.00, 3.5 is entered as 3.50, 0.3750 is entered as 0.38 | | Suppose a survey of 36 people determined...

  • Gender Blood Glucose Female 94 d. Determine the sample mean and sample standard deviation of the...

    Gender Blood Glucose Female 94 d. Determine the sample mean and sample standard deviation of the Blood Glucose for both men and women. Test the claim that the average mean Blood Glucose of women is different from the average mean Blood Glucose of men. Use α = 0.01. Hint: It would be helpful to sort the data based on gender. (8 points) Male 92 Male 93 Mean Glucose Female Female 94 Standard Deviation Glucose Female Male 98 Sample Size Female...

  • 4. In a survey conducted to determine, among other things, the cost of vacations taken by...

    4. In a survey conducted to determine, among other things, the cost of vacations taken by single adults in a particular region, 144 individuals were randomly sampled. Each person was asked to assess the total cost of her or his most recent vacation. The average cost was $2386 and the standard deviation was $400. (a) (2) Estimate with a 99% confidence interval the average cost of a trip for all single adults in the region (b) [2] How large a...

  • Suppose that an accounting firm does a study to determine the time needed to complete one...

    Suppose that an accounting firm does a study to determine the time needed to complete one person’s tax forms. It randomly surveys 100 people. The sample mean is 23.6 hours. There is a known standard deviation of 7.0 hours. The population distribution is assumed to be normal. a. i. x ¯ =________ ii. σ =________ iii. n =________ b. In words, define the random variables X and X ¯ . c. Which distribution should you use for this problem? Explain...

  • Suppose a sample of size 12 is taken, resulting in a sample mean of 300 and...

    Suppose a sample of size 12 is taken, resulting in a sample mean of 300 and a sample standard deviation of 30. Determine the Point Estimate and the Standard Error for a 99% Confidence Interval for this sample. Round all calculations to two (2) decimal places.

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