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1. What is a confidence interval, and why is it useful? What is a confidence level?
2. Explain why in classical statistics describing a confidence interval in terms of probability makes no sense.
3. Explain how the postsampling confidence level is derived from a presampling probability.
an investor is considering purchasing a small business. he knows that in case of a good market the business will yield
Nationwide, GMAT scores in a particular year had an average of 528 with an SD of 112 and the scores roughly followed a normal curve. If a student scored 600 on the exam, approximately what percentage of test-takers scored below this student?
perform exploratory data analysis on all variables in the data set. because you are going to focus on extroversion and
the results of a recent poll on the preference of voters regarding the presidential candidates are shown below. voters
researchers at the university of california-berkeley have designed built and tested a switched-capacitor circuit for
Use the Welch t -tools to find a two-sided p-value and confidence inter- val for the effect of treatment on lifetimes of guinea pigs in Chapter 2, Exercise 11. Does the additive treatment effect seem like a sensible model for these data?
first graders who misbehave in school may be more likely to be regular smokers as young adults according to a new study
Analyze the data and explain which one would be the better medication for both a sore throat and a fever. If damage to the fuselage was far more common, explain why he made this recommendation.
a dividend is a payment from a publicly traded company to its shareholders. the dividend yield of a stock is determined
find the probabability a value will be less than 1.65 standard deviations above the
Test the claim by random sampling 60 hgh school boys. Researcher found 54 boys have a cell phone at a = 0.01. Should the claim be rejected?
in answering a question on a multiple-choice test a student either knows the answer or guesses. let p be the
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