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Why do we need hypotheses tests?
What is the difference between the null hypothesis and the alternative hypothesis?
Why do we need a null hypothesis?
What is the difference between statistical significance and practical significance?
Why do we need to look at a scatterplot when assessing correlations (see the below figure for ideas)
At the 0.10 level of significance, could the population slope and the population coefficient of cor- relation be zero? Determine the 90% confidence interval for the population slope.
b) What's the probability that any given driver will be detained? What's the probability that a driver who is detained has actually been drinking?
What is the probability that at least one of them will have a defective part?
The following data resulted from an experiment to assess the potential of unburnt colliery spoil as a medium for plant growth. The variables are x = acid extractable cations and y = exchangeable acidity/total cation exchange capacity ("Exchangeabl..
Draw a histogram of TPCP. Estimate by eye the lowest and the highest data values from the graph (do not calculate; instead, estimate from your graph). Are there any outliers
Suppose you want to decrease your margin of error by a factor of 6. By what factor do you need to increase your sample size? In other words, if you want to decrease your margin of error from 54% to 9%, by what factor do you need to increase your..
question 1 if an unbiased coin is flipped 3 times what is the probability of getting exactly two heads?question 2 what
What are the mean and standard deviation of the number of twin births we might expect?- Can we use a Normal model in this situation? Explain.
In a gallop poll of 1000 adults, 930 said that restaurants and bars should refuse service to patrons who had too much to drink. Find a 90% confidence interval.
The topic for discussion in the Forum of Unit 6 are mathematical models and how good they should fit reality. In this Forum we would like to return to the same.
Based on these findings, can we reject the company's claim that the drug is equally effective for men and women? Use a 0.05 level of significance.
Suppose that the load on an airplane wing is a random variable X obeying a normal probability law with mean 1000 and variance 14,400, whereas
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