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Question: The ‘‘name game.'' Check the assumptions for the completely randomized design ANOVA in Exercise.
Exercise: The ‘‘name game.'' Psychologists at Lancaster University (United Kingdom) evaluated three methods of name retrieval in a controlled setting (Journal of Experimental Psychology-Applied, June 2000). A sample of 139 students was randomly divided into three groups, and each group of students used a different method to learn the names of the other students in the group. Group 1 used the ‘‘simple name game,'' where the first
student states his/her full name, the second student announces his/her name and the name of the first student, the third student says his/her name and the names of the first two students, etc. Group 2 used the ‘‘elaborate name game,'' a modification of the simple name game where the students not only state their names but also their favorite activity (e.g., sports). Group 3 used ‘‘pairwise introductions,'' where students are divided into pairs and each student must introduce the other member of the pair. One year later, all subjects were sent pictures of the students in their group and asked to state the full name of each. The researchers measured the percentage of names recalled for each student respondent. The data (simulated based on summary statistics provided in the research article) are shown in the accompanying table. Conduct an analysis of variance to determine whether the mean percentages of names recalled differ for the three name retrieval methods. Use α = .05.
A 99% confidence interval for the actual mean noise level in hospitals is(______db , ______db), We can be 90% confident that the actual mean noise level in hospitals is______db with a margin of error of______db
A factory finds,on average, 20% of the widgets produced by a given machine will be defective for certain specified requirements.
What is the probability that six randomly sampled sections of size 400 square feet will each have 7 or fewer blemishes?
A company that manufactures precision special-alloy steel shafts claims that the variance in the diameters of shafts is no more than 0.0003. A random sample of 10 shafts gave a sample variance of 0.00027. At the 5% level of signi?cance, test wheth..
what is the value of sp for the following set of data? explain answer and show work please.x y1 53 38
A polling company wants to know how many people over the age of 18 in the United States are unemployed. They take a simple random sample of 500 from the United States to find the percentage.
in an experiment conducted by the mining engineering department at virginia tech to study a particular filtering
More sales and profits. Consider again the relationship between the sales and profits of Fortune 500 companies that you analyzed in Exercise.
Suppose you toss ten coins and count the number of heads. What is the probability that the number of heads you count will lie within two standard deviations of the mean?
Determine if the distribution of the number of FasTrak users could be described as a binomial distribution with a population proportion equal to 0.50.
Draw the histogram for these data using an initial class boundary of and a class width of . Note that you can add or remove classes.
The distribution of hits/9-innings is approximately normal with mean 8.72 and standard deviation 1.10. Demonstrate, statistically, why a no-hitter is considered an extremely rare occurrence in MLB.
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