Deviation 0.220 0.220 0.207 0.206 Level of Significance (alpha) 0.010 0.010 0.010 0.010 Critical Value (lower tail) -2.576 -2.576 -2.576 -2.576 Critical Value (upper tail) 2.576 2.576 2.576 2.576 Hypothesized value 12 12 12 12 Standard Error 0.040 0.040 0.038 0.038 Test Statistic -1.027 0.713 -2.935 2.161 p-value 0.304 0.476 0.003 0.031 Only sample 3 leads to the rejection of the hypothesis H0: µ = 12. Thus‚ corrective action is warranted for sample 3. The other samples indicate
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Our Research Proposal Topic:Newspaper reading habits 1) Problem Definition: -What is the purpose of the study? Our purpose is to find out the number of students who prefer newspapers in our college campus. -How much is already known? So far there is no data collected on this topic. But the reason behind choosing this topic is to know how many people prefer newspapers over any other source of news related information such as magazines‚ journals‚ internet
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control purposes. Class Interval = {u – [Z*Error]‚ u + [Z*Error]} = {12 – [2.58*0.038]‚ 12 + [2.58*0.038]} = {11.901‚ 12.098} Sample 1 Sample 2 Sample 3 Sample 4 SAMPLE MEAN 11.958 12.028 11.889 12.081 From the data it was found that the mean of sample 3 does not fall with class interval and therefore corrective action must be taken on it. 4) Discuss the implications of changing the level of significance to a larger value. What mistakes or error could increase if the level of significance
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results. In particular‚ the variance between individual results within the sample is a good indicator of variance in the overall population‚ which makes it relatively easy to estimate the accuracy of results. However‚ SRS can be vulnerable to sampling error because the randomness of the selection may result in a sample that doesn’t reflect the makeup of the population. For instance‚ a simple random sample of ten people from a given country will on average produce five men and five women‚ but any given
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The report is divided into several well-defined sections. Each section must be present in a complete report. To earn an outcome point for the laboratory report‚ a student must submit a formal lab report that earns a score of at least 90/100. Each error (factual‚ grammatical‚ typographical‚ spelling) results in a deduction of 5/100. Several opportunities will be offered through the second half of the semester for students to submit a successful report. Sub-par reports may not be resubmitted for regrading
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Chapter 1 Statistics is the science of: -Planning studies and experiments -Collecting data -Organizing‚ summarizing‚ and presenting -Analyzing -Drawing conclusions based on the data -Population: the complete collection of all measurements or data that are being considered. -Sample: sub collection of members selected from a population. -Census: collection of data from every member of a population. What does Statistics Do? -Collect data -Summarize the dataset collected -Make inferences
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1.Single random sampling : a. Definition: Simple random sampling is the basic sampling technique where we select a group of subjects (a sample) for study from a larger group (a population). Each individual is chosen entirely by chance and each member of the population has an equal chance of being included in the sample. Every possible sample of a given size has the same chance of selection; i.e. each member of the population is equally likely to be chosen at any stage in the sampling process.
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to discipline people for making mistakes. Moreover‚ some members of the professional staff still believed that many errors occurred due to incompetence rather than failed systems. They worried that blameless reporting might make it more difficult to identify poor performers in their units. 2) What barrier(s) did Morath face as she tried to encourage people to discuss medical errors more openly? How did she overcome those barriers? Answer: It is difficult to broach the topic of safety because most
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Question 1 2 out of 2 points If average forecast error is positive‚ it indicates that the forecast is biased high. Answer Selected Answer: False Correct Answer: False Question 2 2 out of 2 points A seasonal effect is one that repeats at fixed intervals of time‚ typically a year‚ month‚ week‚ or day. Answer Selected Answer: True Correct Answer: True Question 3 2 out of 2 points The Delphi method develops a consensus
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“margin of error‚” do we know we have trustworthy information before us? It certainly beats voluntary response‚ but not always by as much as we might hope. Sampling in the real world is more complex and less reliable than choosing a Simple Random Sample (SRS) from a list of names in an exercise. Confidence statements do not reflect all of the sources of error that are present in practical sampling. Most sample surveys are afflicted by errors other than random sampling errors. These errors can introduce
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