(iii) Is it true or false to conclude that the fitted model is statistically significant A linear regression model is fitted to determine if a relationship exists between consumer rating of cereal(response)and the number of grams of sugar contained in each serving, grams of fat per serving and grams of dietary fibre perserving as predictors. The sample used was of size 77.(a) The regression sum of squares of fitted model was 13002.226 and error sum of squares was 1994.574. Test forsignificance of fit.

Given that Sample size (n)=77 Regression sum of square=13002.226 Sum of squares error =1994.574 We…

Answered: A linear regression model is fitted to…

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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Similar questions

If a sample is an extreme result and is significant, it will fall in the critical region which indicates a sample mean of that magnitude is unlikely if the null hypothesis is true. True or false?
You wish to test the claim that Washington residents (Group 2) have a higher average monthly bill for their health insurance than Idaho residents (Group 1) at a significance level of a=0.02. Ho: H1- H2 =0 Ha: H1 - H2 < 0 You believe both populations are normally distributed, but you do not know the standard deviations for either or that they have the same standard deviation. You obtain a sample of size 21 with a mean of 87.6 and a standard deviation of 9.5 from the Idaho residents. You obtain a sample of size 13 with a mean of 97.5 and a standard deviation of 10.5 from the Washington residents.
You’re interested in whether there is a difference in the number of recent stressful life events reported by students at UQ vs. QUT vs. Griffith. The outcome measure was skewed. Which statistical test is appropriate to analyse these data? Friedman’s rank test Kruskal-Wallis test Wilcoxon’s rank-sum test Wilcoxon’s signed-ranks test
If a treatment is expected to decrease scores on a variable for which the mean is expected to be µ = 50, what is the null hypothesis?
7. Consider the following ANOVA table for a multiple regression model: Source df SS MS F Regression 118.8475 59.42375 40.92168993 Residual 13.0692 1.452133333 Total 11 131.9167 a) Complete the remaining entries in the table. e) Test the significance of the overall regression model using a=0.05.
Test the claim that the mean GPA of night students is larger than 2.1 at the 0.05 significance level. The null and alternative hypothesis would be: Ho: 4 2.1 H1:p + 0.525 H1:p > 0.525 0.525 Ho:p 2.1 Ho:p > 0.525 Н:р + 2.1 Н:n < 2.1 Ні:р < 0.525 The test is: two-tailed right-tailed left-tailed Based on a sample of 55 people, the sample mean GPA was 2.14 with a standard deviation of 0.02 The p-value is: (to 2 decimals) Based on this we: Reject the null hypothesis Fail to reject the null hypothesis
To identify the correct Z(critical), it is important to determine whether the hypothesis test is one-tailed or two-tailed. The decision between a one- and two-tailed hypothesis is based on the researcher's expectations about the population from which the sample was selected. Many people believe that millennials are having more sex than people during the sexual revolution. You wonder whether the cohort currently in their twenties had sex at an earlier age than older generations. Assume that the the average age of first sexual intercourse is 17.4 years. You obtain a sample that yields a sample mean of X = 15.9 years. Let u denote the average age of first sexual intercourse. Formulate your null and research hypotheses by selecting the appropriate values in the dropdown menus that follow. Ho: (H₁: The test you conduct is test. Note: A one-tailed test is described as a lower-tailed test if the null hypothesis is rejected for values of the test statistic in the lower tail of its…
An automobile manufacturer claims that their van has a 50.5 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the MPG for this van. After testing 101 vans they found a mean MPG of 50.1 with a variance of 4 MPG. Is there sufficient evidence at the 0.1 level that the vans have an incorrect manufacturer's MPG rating? State the null and alternative hypotheses for the above scenario. Answer Ho H₂ Tables Keypad Keyboard Shortcuts
A study was conducted to determine whether magnets were effective in treating pain. The values represent measurements of pain using the visual analog scale. Assume that both samples are independent simple random samples from populations having normal distributions. Use a 0.05 significance level to test the claim that those given a sham treatment have pain reductions that vary more than the pain reductions for those treated with magnets. What are the null and alternative hypotheses? OA. Ho: 002 H₁:0² = 0²/2 OC. H₂:0²=0²2 H₁:0² > 0²/2 Identify the test statistic. F = (Round to two decimal places as needed.) Use technology to identify the P-value. The P-value is (Round to three decimal places as needed.) What is the conclusion for this hypothesis test? C OB. H₁: 0 = 0² H₁:0² +03 OD. H₂:0²=0²2 H₁:0² <0²/ O A. Reject Ho. There is sufficient evidence to support the claim that those given a sham treatment have pain reductions that vary more than those treated with magnets. O B. Fail to reject…
Suppose you needed to test the claim that the two samples described below come from populations with the same mean. Assume that the samples are independent simple random samples. Sample 1: n1 = 13, a1 = 24, s1 = 7.55 Sample 2: n2 = 3, x2 = 21.9, s2 = 8.92 Find: (a) The estimated degree of freedom is (b) The standardized test statistic is (use Sample 1 - Sample 2)
A health manager wants to assess the relationship between number of doctor visits and patient feedbacks.Patient feedbacks are categorized between 1= very bad and 5= very goodin a scale. The SPSS analysis is given below. Write down the hypothesis for this case and specify the test used and comment on the results. Patient Feedback Visit to Doctor 5.00 2.00 4.00 1.00 4.00 2.00 5.00 3.00 4.00 3.00 3.00 4.00 3.00 4.00 4.00 4.00 2.00 5.00 2.00 5.00 3.00 5.00 1.00 4.00 One-Sample Kolmogorov-Smirnov Test Kisisel Saglik Degerlendirmesi Gecen Yil Icindeki Hekim Ziyaret Sayisi N 12 12 Normal Parametersa,b Mean 3.3333 3.5000 Std. Deviation 1.23091 1.31426 Most Extreme Differences Absolute .206 .232 Positive .127 .127 Negative -.206 -.232 Kolmogorov-Smirnov Z .713 .802 Asymp. Sig. (2-tailed) .689 .541 a. Test…
ou wish to test the following claim (Ha) at a significance level of α=0.005. Ho:μ1=μ2 Ha:μ1≠μ2You believe both populations are normally distributed, but you do not know the standard deviations for either, and you have no reason to believe the variances of the two populations are equal. You obtain a sample of size n1=18 with a mean of M1=81.6 and a standard deviation of SD1=8.2 from the first population. You obtain a sample of size n2=23 with a mean of M2=88.9 and a standard deviation of SD2=5.8 from the second population. What is the test statistic for this sample? (Report answer accurate to two decimal places.) test statistic =

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