Answered: Use then given information to find the…

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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A psychologist believes that youths identified as lesbian, gay, or bisexual already know their sexual orientation before they turned 18. To verify this, she took a random sample of 654 young adults that identified as lesbian, gay, or bisexual and asked them the age when they first realized their sexual orientation. It is known that the mean age when a young adult first realized they might be lesbian, gay, or bisexual is normally distributed. R COMMANDER OUTPUT sd se (mean) mean n 14.72199 14.9814 0.57568 654 95 percent confidence interval: 13.572 15.872
Think about doing a One-sample t-test. Think about doing step two, looking up the t-critical. Which option below contains only things that are correctly matched for looking up a t-critical? A. One tail, predicted decrease, a=.05, n=60, t-critical= -1.671 B. Two tails, a=.01, n=20, t-critical=+/- 2.539 C. Two tails, a=.05, n=30, t-critical= +/- 2.042 D. One tail, predicted increase, a=.01, n=60, t-critical +/- 2.423
Use the data on student load. to test the claim that mean student load is more than 6.5 units. Use α = 0.10. Assume all requirements have been met. Student Unit Load 3, 12, 6, 9, 6, 12, 15, 12, 7, 9, 3 Test the claim that mean student load is more than 6.5 units. Use α = 0.10. Assume all requirements have been met.
A consumer advocacy group tests the mean vitamin C content of 50 different brands of bottled juices using, in each case, a t-test of significance in which the null hypothesis is the mean a mount of vitamin C that is on the nutrition facts label for that brand of juice. They find that two of the 50 juice brands have statistically significantly lower Vitamin C than claimed at the 0.05 level. Is this an important discovery? Explain.
Test the claim that for the population of statistics final exams, the mean score is 79 using alternative hypothesis that the mean score is different from 79. Sample statistics include ?=17, x¯=80, and ?=16.s=16. Use a significance level of ?=0.01.. (Assume normally distributed population.)The test statistic is
USE 3 DECIMAL A producer claims that his potato chips weight has a normal distribution at least 150 grams. The manager tries to test day shift production weight is heavier that night shift. Because of the complaints of the customers, quality control department select randomly 19 bags from the day shift and find the mean as 146 grams and variance 9 grams and randomly selected 21 bags from the night shift and find the mean as 148 grams and variance 8 grams. If manager want to test the claim as night shift mean weight of the product is greater than that of day shift at 1% level of significance. Calculate the test statistics. (H1: m night shift > m day shift).
Use the data below to test the claim that the weight loss was greater with the low fat diet compared to the low carbohydrate diet. Use a 5% level of significance. Low Fat Low Carbohydrate X = 4.71b X = 3.51b S1 = 7.21b "ị = 77 S1 = 6.91b n = 52 1. Identify the tail of the test. [ Select] 2. What is the P-value? [ Select] 3. Will the null hypothesis be rejected? [Select ] 4. Is the initial claim supported? [ Select]
A null hypothesis states that p=.7, the observed sample proportion is p=.653 with a sample size of n=90. Determine the z-score. -0.97 O 0.92 -1.48 O 1.35
A test of the claim that the proportion of residents with that least two jobs is more than 53% produces the test statistic z = 1.68 Find the P-value.
Español A coin-operated coffee machine made by BIG Corporation was designed to discharge a mean of 7.2 ounces of coffee per cup. BIG has good reason to believe that the mean amount of coffee dispensed by the machine, u, is greater than 7.2 ounces, and plans to do a statistical test of the claim that the machine is working as designed. Technicians gather a random sample of fill amounts and find that the mean of the sample is 7.6 ounces and that the standard deviation is 0.5 ounces. Based on this information, complete the parts below. (a) What are the null hypothesis H. and the alternative hypothesis H, that should be used for the test? Ho :0 O
Justin wants to know whether a commonly prescribed drug does improve the attention span of students with attention deficit disorder (ADD). He knows that the mean attention span for students with ADD who are not taking the drug is 2.3 minutes long. His sample of 12 students taking the drug yielded a mean of 4.6 minutes. Justin can find no information regarding σx , so he calculated s2x =1.96. a. Identify the independent and dependent variables. b. In a sentence, state the null hypothesis being tested. c. Using symbols, state the null and alternative hypotheses. d. Determine the critical region using a one-tailed test with alpha = .05. e .Conduct the hypothesis test (Do the math and compare the t-critical and t-obtained values). f. State your conclusions in terms of H0 (Should you reject the H0 or fail to reject/accept the H0). g. Based on your analysis, is there a relationship between the drug and attention span?
2. (MMC 6.43). The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures the motivation, attitude toward school, and study habits of students. Each score ranges from 0 to 200. The mean attitude score for U.S. college students is about 110, and the standard deviation is about 25. A teacher who suspects that older students have better attitudes toward school gives the SSHA to 25 students who are at least 30 years of age. Their mean score is = 118.3. a. Assuming that o = 25 for the population of older students, carry out a test of Họ: H = Ha:u > 110 Report the P-value of your test and state your conclusion clearly. = 110 b. What are the required assumptions in part (a)?

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Use then given information to find the P-value. The test statistic in a left-tailed test is z = -1.83. Show work.