11. Consider a hypothesis test with a two-sided alternative hypothesis (not equals). If a confidenceinterval is provided as evidence rather than a p-value, what is the assumed significance level wecan use for the hypothesis test conclusion if:The confidence level is 99%? α =The confidence level is 95%? α =The confidence level is 90%? α =

Answered: 11. Consider a hypothesis test with a…

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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An inspector inspects large truckloads of potatoes to determine the proportion with blemishes prior to using the potatoes to make potato chips. She intends to compute a 95% confidence interval for this proportion. To do so, she selects a simple random sample of 90 potatoes, and finds 12 with blemishes. The 95% confidence interval is (0.063, 0.204). What is the correct interpretation for this confidence interval? The inspector can be 95% confident that the proportion of potatoes with blemishes is 0.133. In 95% of samples taken, between 6.3% and 20.4% of the sampled potatoes would have blemishes. The inspector can be 95% confident that the interval from 0.063 to 0.204 captures the proportion of all potatoes on the truck with blemishes. There is a 5% probability that the proportion of all potatoes that have blemishes is either below 0.063 or above 0.204.
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Which of the following is not true when using the confidence interval method for testing a claim about u when a is unknown? Choose the correct answer below. OA. The P-value method, the traditional method, and the confidence interval method are equivalent and yield the same results. OB. For a one-tailed hypothesis test with a 0.05 significance level, one must construct a 90% confidence interval. OC. The P-value method and the classical method are not equivalent to the confidence interval method in that they may yield different results. OD. For a two-tailed hypothesis test with a 0.05 significance level, one must construct a 95% confidence interval.
Calculate the SEMean Construct a 98% confidence interval for the population scores of Mrs. Paul’s students. State the null and alternate hypothesis for this test.
Which of the following statement(s) about confidence intervals are correct? 1) There is no relationship between sample size and confidence interval's width 2) the smaller the sample size, the wider the confidence interval. 3) The higher the confidence level, The narrower the confidence interval. 4) The higher the confidence level, The wider the confidence interval. 5) The larger the sample size, The wider the confidence interval. 6) There is no relationship between confidence level and confidence interval's width.
Q3.In a sample of 200 residents of Georgetown country, 120 reported they believe that country real estate taxes were too high. Developed a 95% confidence interval that proportioned of residents who believe the tax rate is too high. Would it be reasonable to conclude that the majority of the taxpayers feel that the text says I too high.
45. Dr. Susan Benner is an industrial psychologist. She is currently studying stress among executives of Internet companies. She has developed a questionnaire that she believes measures stress. A score above 80 indicates stress at a dangerous level. A random sample of 15 executives revealed the following stress level scores. 94 78 83 90 78 99 97 90 97 90 93 94 100 75 84 Construct a 95% confidence level for the population mean. According to Dr. Benner's test, is it reasonable to conclude that the mean stress level of Internet executives is 80? Explain. a. b. C. d. X±Z p±z\ p(1-P) n x ±1 -3 n= Za e. None of these. Which formula? 106
If all the confidence intervals overlapped, does that imply that the mean must be in that overlap? I claim 49.5% of the study population is female. Conduct a hypothesis to test if I am wrong, to see if the population proportion is of female patients is not 49.5%. Use a 5% level of significance. State your conclusion to each hypothesis test. What is a Type I error? How many of your hypothesis tests agree? If different samples gave you different hypothesis test results (i.e. some rejected the null hypothesis and some did not) does that mean your sampling design for the incorrect hypothesis test(s) was faulty?
5.
Please help for the first one wrong, it wasn’t 4.49
11. In professional tennis for 2017 men challenged 2100 calls and 1105 of them were changed. While women challenged 1309 calls and 625 of them were changed. Find a 95% confidence interval for the difference in changed calls for men and women. 12. For problem # 11 conduct a hypothesis test to test the claim that men get more calls changed than women. Use a significance level of .05. 14. Find a 99% confidence interval for the difference in males and females BMI using the following sample data.Female BMI: n=70, mean=29.1, Sx=7.39.Male BMI: n=80, mean=28.38, Sx=5.37.
Here are summary statistics for randomly selected weights of newborn girls: n= 181, x = 31.8 hg, s = 7.7 hg. Construct a confidence interval estimate of the mean. Use a 90% confidence level. Are these results very different from the confidence interval 30.9 hg <µ< 33.5 hg with only 20 sample values, x 32.2 hg, and s =3.4 hg? What is the confidence interval for the population mean u? hg

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