A sample of 20 items provides a sample standard deviation of 9.5. Test the following hypotheses using a = 0.05. What is your conclusion?Ho: 0² ≤50H₂:0² > 50Use the p-value approach.Find the value of the test statistic.Find the p-value. (Round your answer to three decimal places.)p-value==State your conclusion.Reject HoWe conclude that the population variance is greater than 50.Do not reject Ho. We conclude that the population variance is greater than 50.Reject Ho. We conclude that the population variance is not greater than 50.Do not reject Ho. We conclude that the population variance is not greater than 50.Use the critical value approach.Find the value of the test statistic.

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Answered: A sample of 20 items provides a sample…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Calculate the standard deviation and variance of the given random sample data. Round to two decimal places. x 23.3 15.4 8.4 29 28 14.5 Variance:
1J,000 Source: Chronicle of Higher Education. 17. Medical Operations The director of a medical hospital feels that her surgeons perform fewer operations per year than the national average of 211. She selected a random sample of 15 surgeons and found that the mean number of operations they performed was 208.8. The standard deviation of the sample was 3.8. Is there enough evidence to support the director's feelings at a= 0.10? Would the null hypothesis be rejected at a = 0.01? 18. Cell Phone Call Lengths The average local cell phone call length was reported to be 2.27 minutes. A random sample of 20 phone calls showed an average of 2.98 minutes in length with a standard deviation of 0.98 minute. At a = 0.05, can it be concluded that the average differs from the population average? %3D World Almanac.
Test the claim below about the mean of the differences for a population of paired data at the level of significance a. Assume the samples are random and dependent, and the populations are normally distributed. Claim: 0 = 0 E. Ho: Hd 0 Ha: Hd s0 The test statistic is t= 1.43 . (Round to two decimal places as needed.) The critical value(s) is(are) to = (Round to two decimal places as needed. Use a comma to separate answers as needed.)
You want to know if a treated sample mean, M, is significantly different from some hypothesized mean, however, you do not have access to the popuation standard deviation, so you estimate it by computing the standard deviation of the sample. Which stats test do you run? a. z test for determining position of a score, x, in a population. b. one-sample t test. c. independent-samples t test. d. z test for determining the position of a mean, M, in a sampling distribution.
Need help with question b (the answer is not -0.64 ; 0.82)
I need help with this one please thank you
Solve part a,b and c of practice question #2. Please and thank you.
Test the claim below about the mean of the differences for a population of paired data at the level of significance a. Assume the samples are random and dependent, and the populations are normally distributed. Claim: H, 20; a = 0.05. Sample statistics: d = -2.2, s, = 1.5, n=14 Identify the null hypothesis by writing its complement. O A. Ho: Ha #0 Ha: H = 0 O B. Ho: Hg s0 Hgi Hg>0 O D. Ho: Ha 0 E. Ho: Ha 20 H: H <0 The test statistic is t= -5.49. (Round to two decimal places as needed.) The critical value(s) is(are) t, = - 1.77 (Round to two decimal places as needed. Use a comma to separate answers as needed.) V the rejection region, V the null hypothesis. There V statistically significant evidence to reject the claim. Since the test statistic is
Test the claim below about the mean of the differences for a population of paired data at the level of significance a. Assume the samples are random and dependent, and the populations are normally distributed. Claim: H, 20; a= 0.05. Sample statistics: d= -2.2, s, =1.5, n= 14 Identify the null hypothesis by writing its complement. COA. Ho: Ha #0 H: Ho =0 OB. Ho: Pa s0 OC. Ho: Ha =0 OD. Ho: Ha 0 H: Hg <0 The test statistic is t= - 5.49. (Round to two decimal places as needed.) The critical value(s) is(are) t, = - 1.77. (Round to two decimal places as needed. Use a comma to separate answers as needed.) Since the test statistic is V the rejection region, V the null hypothesis. There V statistically significant evidence to reject the claim.
Test the claim below about the mean of the differences for a population of paired data at the level of significance a. Assume the samples are random and dependent, and the populations are normally distributed. Claim: 0 Ha: Hd s0 E. Ho: Ha 0 F. Ho: Ha 20 Ha: Ha <0 The test statistic is t= 1.94 . (Round to two decimal places as needed.) The critical value(s) is(are) to (Round to two decimal places as needed. Use a comma to separate answers as needed.)
Claim: The mean systolic blood pressure of all healthy adults is less than than 125 mm Hg. Sample data: For 266 healthy adults, the mean systolic blood pressure level is 124.47 mm Hg and the standard deviation is 15.29 mm Hg. The null and alternative hypotheses are Ho: μ = 125 and H₁: µ< 125. Find the value of the test statistic. C The value of the test statistic is. Round to two decimal places as needed.) ple Get more help - A X Question 6 (0/1) ✓ Question 10 (1/1) Question 7 (0.67/1) 4 Clear all Check answe Question 8 (0.67/1)

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