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The term critical value is often used to refer to the value of a test statistic that determines statistical significance at some fixed α level for a test. For example, +1.96 are the critical values for a two-tailed z-test at α = 0.05. In performing a t-test based on 21 observations, what are the critical values for a one-tailed test when α = 0.05? That is, what values of the tstat will give a one-sided p-value that is less than or equal to 0.05? What are the critical values for a two-tailed test at α = 0.05?
Given the following hypotheses: the true mean equals 100 (the null) and the true mean does not equal 100 (the alternate), a random sample of six resulted in the following values:
Consider the following simple regression model for which ∈i ∼ N(0, σ), Write the above model in matrix form. Find the least squares estimates using vectors and matrices
the width of a slot of a duralumin forging is in inches normally distributed with micro 0.9000 and ? 0.0030. the
You are reading an article detailing a study designed to compare the average body mass index among hypertensive individuals (persons with high blood pressure) to normotensive individuals. The study was conducted using participants in a health pla..
discuss the various sampling methods we might use in determining which items to include in a
in a study subjects are randomly assigned to one of three groups control experimental a or experimental b. after
Tthe sticks in the shipment fail to meet specifications. What is the probability that no more than 3 will be defective? What is the probably that more than 5 will be defective?
Will the distribution of x bar always be approximately normally distributed, or does it depend on the distribution of the population?
the average life expectancy in the united states l has been rising steadily over the past few decades as shown in the
Marketing estimates the probability of low demand as 35% with a probability of 65% that demand will be high. As the Business Intelligence Analyst what is your estimate of the overall return and best course of action?
Twenty five young people were sampled in a survey to be used in determining the average expenditures (in dollars) for an evening of dining out.Create a cumulative relative frequency Ogive chart.
What are the key conceptual differences between these 3 methods? In other words, under what conditions do we choose each method for our analysis, and why?
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