Problem 10.4. We continue with the situation in Problem 8.8. Assumethat the two sample sizes are nį = 19 and n2 = 12 and the two samplevariances are s = 0.81 and s = 0.49. Is there enough evidence that fam-ilies from culled populations have a lower bunching intensity than familiesfrom non-culled populations? Use a test of hypothesis at level a = 0.005.Suppose that the two populations are normally distributed with equal vari-%3Dances. Problem 8.8. Between 1967 and 1995, South Africa controlled its elephantpopulations through “culling", i.e. killing older animals. Scientists believethat in some populations, the surviving young elephants who experiencedculling have symptoms similar to the post-traumatic stress disorder in hu-mans. The authors of article [60] investigated the effects of culling, usinga variable called "bunching intensity", which gives the response to threatfor a family of adult female elephants. This variable has values between 0and 4, with 0 ="no response" and 4 = "very fast response". We considertwo populations of elephants, one of which had experienced culling and theother had not. A sample of n1 families from the culled population has amean bunching intensity of 1.2, whereas a sample of n2 families from thenon-culled population has a mean bunching intensity of 2.5. The meanbunching intensity for the combined two samples is 1.7. What is the pro-portion of families who experienced culling in the combined two samples?

Name: Problem 10.4. We continue with the situation in Problem 8.8. Assumeth
Uploaded: 2024-03-20T07:07:12.000Z
Channel: Bartleby
Description: Problem 10.4. We continue with the situation in Problem 8.8. Assumethat the two sample sizes are nį = 19 and n2 = 12 and the two samplevariances are s = 0.81 and s = 0.49. Is there enough evidence that fam-ilies from culled populations have a lower

Answered: Image /qna-images/answer/3336284f-83d8-453d-b8dd-f464264d7b2b.jpg

Math

Statistics

Problem 10.4. We continue with the situation in Problem 8.8. Assume 12 and the two sample that the two sample sizes are nį variances are s? = 0.81 and s = 0.49. Is there enough evidence that fam- ilies from culled populations have a lower bunching intensity than families from non-culled populations? Use a test of hypothesis at level a = Suppose that the two populations are normally distributed with equal vari- 19 and n2 0.005. ances.

Problem 10.4. We continue with the situation in Problem 8.8. Assume 12 and the two sample that the two sample sizes are nį variances are s? = 0.81 and s = 0.49. Is there enough evidence that fam- ilies from culled populations have a lower bunching intensity than families from non-culled populations? Use a test of hypothesis at level a = Suppose that the two populations are normally distributed with equal vari- 19 and n2 0.005. ances.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

We are running a hypothesis test to see if weight of African zebras is significantly different than that of Arabian horses. We assume weight in both populations is normally distributed and both populations have the same population variance in weight which is unknown to us, so we use the sample variances to estimate the standard error for our calculations. We have a sample of size 9 for the African zebras with mean 650 and a sample of size 16 for the Arabian horses with mean 660. If the pooled variance is 225, then what is the absolute value of the standardized test statistic for our data?
A new study has found that, on average, 6- to 12-year-old children are spending less time on household chores today compared to 1981 levels. Suppose two samples representative of the study's results report the following summary statistics for the two periods. 1981 Levels 2008 Levels 24 minutes 19 minutes 51 = 3.5 minutes 52 - 4.3 minutes ni = 30 n2 - 30 Which of the following is the correct value of the test statistic assuming that the unknown population variances are equal? Multiple Cholce Z = -4.94 tss = 4.94 Z = 4.94 t59 = -4.94
A snow shovel manufacturer is considering a new shovel with small holes punched in it, thought to reduce energy expenditure of the user. The data in the Problem 4 tab provides information for 13 workers using both the conventional shovel and the perforated shovel. Does the data suggest that the energy expenditure of the perforated shovel is lower than that of the conventional shovel? Does the data suggest that the variance of the two shovels is different?
There are two samples. Sample 1 has n=10 and a sample variance of 4. Sample 2 has n=8 and a sample variance of 9. Calculate the standard error of the difference between the two sample means (to 2 decimal points). Assume that the variances in the two populations that produced the samples are equal.
In the Izmir University of Economics, a professor claims that exam scores for non-accounting majors are more variable than for accounting majors. Random samples of 30 non-accounting majors and 30 accounting majors are taken from a final exam held on 2019. Test at the 5% level the null hypothesis that the two population variances are equal against the alternative that the true variance is higher for the non-accounting majors. Assume the populations are normally distributed. s = 1584.272 ny = 30 s = 400.495 Non-Accounting n = 30 Accounting To test the professor's claim, identify the null and alternative hypotheses. The null hypothesis is represented by H, and the alternative hypothesis is represented by H,. Choose the correct answer below. O A. Ho: o 2 O B. Ho: o = OD. Ho: o =0 H,: o
We are running a hypothesis test to see if blood pressure of African zebras differs significantly from Arabian horses. We assume blood pressure in both populations is normally distributed and both populations have the same population variance in blood pressure which is unknown to us, so we use the sample variances to estimate the standard error for our calculations. We have a sample of size 9 for the African zebras and a sample of size 16 for the Arabian horses. How many degrees of freedom does our test statistic have?
The data from an independent-measures research study produce a sample mean difference of 4 points, and each sample has a variance of 10. If there are n = 20 scores in each sample, then what is the estimated standard error of the difference between means?
A researcher was interested in knowing if mean BMI was different between males and females. He obtained the following test results. Choose the correct interpretation of the results: F test p value = 0.30 Two sample t test, assume equal variance = 0.02 Two sample t test, assume unequal variance = 0.61 Mean BMI is not significantly different between males and females. None Mean BMI is higher in males than females. Mean BMI is significantly different between males and females.
suppose that we have disjoint normal populations A and B and we want to find the standard error estimate for estimating the difference in their means. We have an IRS from A of size 8 with variance 25 and an IRS from B of size 9 with variance 16. What is the resulting standard error estimate if we assume both populations have the same population variance?
A certain producer of chocolate has some problems with the variability of five suppliers of cocoa. Since the cocoa quality is critical to the final chocolate product, the company has decided to perform a DOE to compare these suppliers. According to experiences with customers, the capacity of detection of any variation is 3.5 units. Estimate the sample size needed to get at least a power of 85%, given that the historical variance of the process is 2.5 units.
Question 16: Please use the approporate stats table attached. Do not use a software for this problem.a. What was the observed difference between the mean PCV levels for the two groups? b.Assuming that the two groups have similar variances, estimate the standard error of the difference between the sample means c. Conduct an appropriate test to assess the difference between the two means. What do you conclude?
Question 7 > You wish to test the following claim (Ha) at a significance level of a = 0.05. H.: 41 Ha: µ1 7 42 You believe both populations are normally distributed, but you do not know the standard deviations for either. However, you have reason to believe that the variances of the two populations are equal. You obtain a sample of size nį = 14 with a mean of M1 first population. You obtain a sample of size n2 of SD2 = 7.4 from the second population. = 67.8 and a standard deviation of SD1 19 with a mean of M2 15.5 from the 61.7 and a standard deviation In the answer box below insert 2.0395 as the critical value for this test. (Report answer accurate to three decimal places.) critical value What is the test statistic for this sample? (Report answer accurate to three decimal places.) test statistic = %3D The test statistic is... O in the critical region O not in the critical region