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Twelve teachers attended a seminar on mathematical problem solving. Their attitudes were measured before and after the seminar. A positive number change attitude indicates that a teacher's attitude toward math became more positive. The twelve change scores are as follows: 3; 8; -1; 2; 0; 5; -3; 1; -1; 6; 5; -2
b. What is the standard deviation for this population?
c. What is the median change score?
d. Find the change score that is 2.2 standard deviations below the mean.
Compute expected frequencies for each of the cells in the table in part c). Do you feel that the exponential distribution provides an adequate description of these data?
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Suppose than an instructor want wants to investigate whether the font used on an exam affects student performance as measured by the final exam score. She uses four different fonts (time , courier, helvetica, comic sans ) and randomly assigns h..
Find an estimate of the probability distribution of x = this song's rating by a randomly selected listener who is familiar with the song.
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1. Find an article in the newspaper illustrating frequencies. Include a short summary of the article. Indicate the name of the newspaper, date, and name of the article. 2. Find an article in the newspaper illustrating mean, median, and mode. Includ..
The heights of 20 students are as follows (rounded to the nearest inch): 65, 68, 65, 70, 67, 67, 68, 66, 69, 70, 68, 67, 67, 65, 69, 65, 67, 66, 69, 69 Prepare a frequency distribution for this data.
Identify the type of study proposed and indicate its specific strengths and weaknesses
The mean sales per customer µ for all of the sales for your company last month is not known. Based on your past experience, you are willing to assume that the population standard deviation of sales, σ, is about $220. If you take a random sample of 10..
A sample of 10 executives indicated that they spent an average of $11.30 with a sample standard deviation of 0.56 on lunch. Let = 0.05. What are the critical values?
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