HomeworkLib
Question

12. A random sample of n = 12 months of stock returns is taken and the sample variance of mont returns (s2) is found to be 16, Provide a 95% confidence interval for the estimate of the population variance (σ). (5 points)
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

S26 Low end二 12-x16/ 2 12-) 3 8157 46 12S2 8.02 92244 6 12s2

0 0
Add a comment
Know the answer?
Add Answer to:
12. A random sample of n = 12 months of stock returns is taken and the...
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

  • A random sample of 100 daily stock returns was taken. The average return in the sample...

    A random sample of 100 daily stock returns was taken. The average return in the sample appeared to be 4.81%. The population standard deviation is not known, but the sample standard deviation is known to be 0.9%. a. Calculate a 95% confidence interval for the average stock return b. If the sample contained 150 stock returns, would the confidence interval found in problem 3 a) become wider? . Yes 2. No 3. The question cannot be answered with the data...

  • A random sample of n = 25 observations is taken from a N(µ, σ ) population....

    A random sample of n = 25 observations is taken from a N(µ, σ ) population. A 95% confidence interval for µ was calculated to be (42.16, 57.84). The researcher feels that this interval is too wide. You want to reduce the interval to a width at most 12 units. a) For a confidence level of 95%, calculate the smallest sample size needed. b) For a sample size fixed at n = 25, calculate the largest confidence level 100(1 −...

  • Consider the following results for two independent random samples taken from two populations. Sample 1 Sample...

    Consider the following results for two independent random samples taken from two populations. Sample 1 Sample 2 n 1 = 40 n 2 = 35 x 1 = 13.8 x 2 = 11.3 σ 1 = 2.5 σ 2 = 3 What is the point estimate of the difference between the two population means? (to 1 decimal) Provide a 90% confidence interval for the difference between the two population means (to 2 decimals). Use z-table. ( , ) Provide a...

  • A random sample of n=12 values taken from a normally distributed population resulted in the sample...

    A random sample of n=12 values taken from a normally distributed population resulted in the sample values below. Use the sample information to construct a 98​% confidence interval estimate for the population mean. 112 111 90 109 111 102 115 100 108 102 108 110      The 98​% confidence interval is from ​$ to​ $?

  • a random sample of size n 200 is taken and the sample proportion p = 0.21

    Pg 417 6.47 For a hypothesis test H0: p =  0.3 Ha: p < 0.3 a random sample of size n 200 is taken and the sample proportion p = 0.21 (a) Determine whether it is appropriate to use the normal distribution to estimate the p-value. (b) If it is appropriate to use a normal distribution, complete the test for a significance level of 5% Pg 418 6.55 Home Field in Baseball 2009 There were 2430 Major League Baseball games played in 2009, and the home team won the...

  • A simple random sample of size N = 12 is drawn from a population that is...

    A simple random sample of size N = 12 is drawn from a population that is normally distributed. The sample mean is found to be x = 59 and the sample standard deviation is found to be S = 14. Construct a 95% confidence interval about the population mean.

  • A simple random sample of size 64 is drawn from a normal population with a known...

    A simple random sample of size 64 is drawn from a normal population with a known standard deviation σ. The 95% confidence interval for the population mean μ is found to be (12, 16). The approximate population standard deviation σ is:

  • 2. A simple random sample of size n is drawn. The sample mean I is found...

    2. A simple random sample of size n is drawn. The sample mean I is found to be 53.1, and the sample standard deviation s is found to be 7.8 a) (3 points) Construct a 95% confidence interval for the population mean u if the sample size n is 81. b) (3 points) Construct a 95% confidence interval for the population mean u if the sample size n is 30. c) (3 points) Construct a 90% confidence interval for the...

  • 3. Suppose that ai . ,,an are a random sample from a N( ,02) distribution. Recall...

    3. Suppose that ai . ,,an are a random sample from a N( ,02) distribution. Recall that the MLE in this case is [a, σ]T = [x, V (n-1)s2/n]T and the information matrix is Consider the data s2-4.84 with n 16 (a) Use the delta-method to obtain an approximate 95% confidence interval for log(o) (b) Obtain an approximate 95% confidence interval for σ2 using the confidence interval from (a). Compare to the exact interval, [2.21,15.77], and approximate interval [0.43, 10.50...

  • Suppose that X . . . . . Xn is a random sample from a normal...

    Suppose that X . . . . . Xn is a random sample from a normal population with unknown mean μ x and unknown variance σ I. What is the form of a 95% confidence interval for μχ . Îs your interval the shortest 95% confidence interval for μχ that is avail- able? 2. What is the form of a 95% confidence interval for . Is your interval the shortest 95% confidence interval for σ,' that is avail- able? 3....

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