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The paper "Answer Changing on Multiple-Choice Tests" (Journal of Experimental Education [1980]: 18-21) reported that for a group of 162 college students, the average number of responses changed from the correct answer to an incorrect answer on a test containing 80 multiplechoice items was 1.4. The corresponding standard deviation was reported to be 1.5. Based on this mean and standard deviation, what can you tell about the shape of the distribution of the variable number of answers changed from right to wrong? What can you say about the number of students who changed at least six answers from correct to incorrect?
A director of an agency is hiring temporary help. In making plans, he has to know whether there isi any difference in the use of the agency at different seasons of the year.
Problem: Three sets of measurement are in the table below.
Discuss how the statistical application of Pearson r is used for hypothesis testing. Through application of the Spearman Correlation discuss what type of data the Pearson formula can be used for.
The probability that her ?rst ?ight leaves on time is 0.15. If the ?ight is on time, the probability that her luggage will make the connecting ?ight in Montreal is 0.95, but if the ?rst ?ight is delayed, the probability that the luggage will make ..
a random sample of 36 radio stations is selected in order to estimate the avaerage charge for the same fixed-length
Construct a frequency distribution (class, tally and frequency) for the data set using the indicated number of classes. In the table, include the midpoint, relative frequencies and cumulative frequencies.
Let's suppose that we have 2 variables year and age.. I use STATA to make them into dummy variables as follows:
21 percent of the employees in a company have managerial positions, and 31 percent of the employees in the company have MBA degrees. Also, 66 percent of the managers have MBA degrees. Using the probability formulas, find the proportion of employee..
Four students riding to school together offer a the excuse of a flat tire on their car for missing a test. On the makeup test, the professor asks the students to each identify the tire that went flat.
The rise of gasoline prices along with record profits at Exxon-Mobile produced stories of corporate greed. How could you use a statistical model to explain the rise of prices at the pump?
elongation measurements are made on 10 pieces of steel five of which were treated with method a aluminum plus calcium
Suppose that a malfunction was reported and it was found to be caused by other human errors. What is the probability that it came from station C?
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