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In one investigation, it was found that children age 12 learn better when allowed to discover rules whereas children age 6 learn better when taught didactically. Is that example of type II error or interaction?
For a fixed sample size, what is the value of the true population proportion p that maximizes the variance of the sample proportion P^?
Election-day polls are taken from voting precincts selected because they are believed to be representative of all voters.
Develop a scatter plot of the data with the dependent variable, cost, on the vertical axis and the independent variable, weight, on the horizontal axis.
On average, a National Express coach arrives every two hours. What is the probability that only one bus will arrive in a four hour period?
The random variable X has the cumulative distribution function F(x) whose value or derivative F(x) is shown below for various values of x.
Create a 90% confidence interval for the percentage of people the company contacts who may buy something. Explain what this interval means. Explain what "90% confidence" means.
Is this a one- or two-tailed test and conduct all 6 steps of the appropriate statistic. Be sure to label all six steps.
calculate the Pearson product-moment correlation coefficient and test for significance at the .01 level and calculate a t-test and test for significance at the .05 level, 2-tailed level of significance.
Assuming that the data is normally distributed and the sample size is greater than 30, calculate the critical values for a two tailed and a one-tailed test when alpha = 0.05
Wwhat can we say about the shape of the distribution of the sample mean? What is the standard error of the mean?
convert an area from one normal distribution to an equivalent area for a different normal distribution. show
By using the normal distribution to approximate the desired probability.
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