Suppose data shows that only 50% of breast cancer patients can survivemore than 5 years. You suspect the claimed survival rate is too low, so you'dlike to conduct a study to examine this situation. What is the null andalternative hypothesis in this situation? Let p represent the true percentageof breast cancer patients who survive more than 5 years.Ho p=0.5 v.s. Ha p > 0.5Ho p=0.5 v.s. Ha : p < 0.5O Hop = 0.5 v.s. Ha : p > 0.5

The objective of this question is to identify the correct null and alternative hypotheses for a…

Answered: Suppose data shows that only 50% of…

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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Life rating in Greece - Greece faced a severe economic crisis since the end of 2009. Suppose a Gallup poll surveyed 1010 randomly sampled Greeks in 2011 and found that 273 of them said they would rate their lives poorly enough to be considered "suffering." Round all answers to four decimal places. 1. What is the population parameter of interest? A. The 273 Greeks in the sample who believed they were suffering. B. The actual proportion of Greeks who said they were suffering in 2011. C. All the people who lived in Greece in 2011. D. The score on the survey that corresponds to suffering. 2. What is the value of the point estimate of this parameter? 3. Use the sample information from 2011 to construct a 95% confidence interval for the proportion of Greeks in 2011 who said they were "suffering."
2. When you performed null hypothesis tests using a z-test for one sample proportion, what kinds of inferences can you draw about a past population's growth rate if you rejected the null hypothesis that the population proportion was 0.16?
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In a Gallup poll of 1040 randomly selected adults, 49% answered "yes" when asked "Do you have a gun in your home?" Identify the sample Identify the population Is the value of 49% a statistics or a parameter? Are the numbers of subjects in such surveys discrete or continuous? The responses are “yes,” “no,” “not sure,” ”refused to answer.” Are these answers quantitative data or categorical data? Also, determine whether the sample is likely to be representative of the population.
Cardiovascular Disease Suppose the incidence rate of myocardial infarction (MI) was 5 per 1000 among 45- to 54-year-old men in 2000. To look at changes in incidence over time, 5000 men in this age group were followed for 1 year starting in 2010. Fifteen new cases of MI were found. Suppose that 25% of patients with Mi in 2000 died within 24 hours. This propartion is called the 24-hour case-fatality rate. Of the 15 new MI cases in the preceding study. 5 died within 24 hours. Test whether the 24-hour case- fatality rate changed from 2000 to 2010.
suppose the mean is 8 and 1/3 and the population variance is 6 and 8/9 and a>9 x 5 9 a frequency 3 f 2 a=? f=?
A poll found that 80% of American adults believed that there was a conspiracy in the death of President Kennedy. A later poll asked 1097 American adults if they believe there was a conspiracy in the assassination, and found that 834 believe there was a conspiracy. Do the data show that the proportion of Americans who believe in this conspiracy has decreased? Test at the 1% level. State the hypotheses. Họ: P ?v H,: P ?v Calculate the test statistic. Round to four decimal places. p = Calculate the standardized test statistic. Round to three decimal places. Z = Find the p-value. Round to four decimal places. p-value = State your decision. O Since the p-value is greater than .01, fail to reject Ho. O Since the p-value is less than .01, fail to reject Ho. O Since the p-value is less than .01, reject Họ- O Since the p-value is greater than .01, reject Ho. Interpret the results. O At the 1% level of significance, there is not enough evidence to show that the proportion of American adults who…
2 proportion z-test 3. In a study done in Michigan, it was determined 38 (out of 62) poor children who attended pre-school needed social services later in life compared to 49 (out of 61) poor children who did not attend preschool. Does this study provide significant evidence that preschool reduces the need for social services later in life?
S K The concerns about the impact of technology on our lives are growing. There have been recent research reports about the negative impact of digital technology usage on stress, work productivity, happiness, and overall well-being. In light of these concems, a polling organization asked technology experts about their opinion on our digital life and found that 28% of the experts believe that in the future our lives will be more harmed than helped by their digital environment. In an effort to confirm these results, a local tech company decides to ask 210 randomly selected customers their opinions about their digital life. Answer parts a through c below. a. What is the probability that 35 or more people from this sample are concerned about the digital environment? The probability is 1. (Round to four decimal places as needed.) b. What is the probability that 45 or more people from this sample are concerned about the digital environment? 0. (Round to four decimal places as needed.) The…
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What is the base rate(or prevalence in medical literature) and sensitivity(the percentage of individuals with a disease who are correctly classified as having the disease?)
For example before the pandemic, students from the 7:00am class reported that they sleep on average 6 hours. However, report shows that it is uncertain whether students sleep longer than six hours or less than 6 hours. Someone consulted you on how to provide statistical evidence whether the students sleep less than 6 hours or more than 6 hours. what test will you use to investigate the problem above?

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