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You may have heard the old adage, "Stay with your first answer on a multiple-choice test." Is changing answers more likely to be helpful or harmful? To examine this, Best (1979) studied the responses of 261 students in an introductory psychology course. He recorded the number of right-to-wrong, wrong-toright, and wrong-to-wrong answer changes for each student. More wrong-to-right changes than right-to-wrong changes were made by 195 of the students, who were thus "helped" by changing answers; 27 students made more right-to-wrong changes than wrong-to-right changes and thus "hurt" themselves.
(a) For these 222 students, conduct a X2 test of the hypothesis that the population proportions of right-to-wrong and wrong-to-right changes are equal. Your conclusions?
(b) What is the effect size?
The following table gives in-state tuition costs (in dollars) for 15 randomly selected colleges taken from a list of the 100 best values in public colleges (source: Kiplinger's Magazine, October 2000).
a farmer was interested in determining how many grasshoppers were in his field. he knows that the distribution of
If a student is selected at random from a list of all the students in the school, what is the probability that he will be in grade 3?
A software company wants to determine whether there is a relationship between their three sales offices and the sales of their software products. The actual sales results are
The results, in tons of force required for breakage, are as follows: Determine the mean, median, range, and midrange. Calculate the mean absolute deviation (MAD).
A manager of a supermarket estimated that 87% of customers use coupons in their grocery purchases. How large a sample is required to estimate the true proportion to within 0.01 with 98% confidence?
Can I get some help for me to understand what is the difference between an equation and an expression? Can you solve for a variable in an expression? Could you explain.
Next, identify a data set that can be used for your process. The data set must consist of at least 25 data points. If your article does not contain a data set, then you may use the data set from Unit 1. Include the data set in your summary.
Quarterbacks. Table gives the total passing yards for National Football League starting quarterbacks during the 2007 season.
Build a Linear Regression Model - Analyze the dataset you created in Project 2.1 and look at the distribution of your data. You can create histograms to look at each of your continuous and categorical data to determine the nature of the data you'r..
How many Corolla buyers must be surveyed if we want to be 95% confident that the sample percentage is within four percentage points of the true percent all Corolla buyers?
Provide and analyze the regression results terms of the funds' performance "returns";does these funds generate returns that are distinctly superior or inferior on a risk-adjusted basis?
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