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A researcher had the idea that background music might enhance performance on a math test and that the effect of music might depend on whether an individual is a music lover or not. She selected 50 music lovers and 50 control participants who did not listen to music on a regular basis. Half of the participants from each group took the math test with background music and the remaining participants took the test without background music. The mean scores were, 62 (SS=25000) for the control participants without music, 53 (SS=23000) for the control participants with music, 48 (SS=22000) for the music lovers without music, and 77 (SS=26000) for the music lovers with music. Conduct an appropriate statistical anaylsis using alpha=0.05.
Note: SS means sum squared.
Do you view a chocolate bar as delicious or as fattening? Your attitude may depend on your gender. In a study of American college students, Rozin, Bauer and Catanese (2003) examined the importance of food as a source of pleasure versus concerns ab..
A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 99% confident that her estimate is correct.
The following table is from the Social Security Actuarial Tables. For each age, it gives the probability of death within one year, the number of living out of an original 100,000 and the additional life expectancy for a person of that age.
Dan Thompson, the president of CEO Airlines, recently noted an increase in the number of no-shows for flights out of Atlanta.
Find the critical value for t and determine the null and alternate hypothesis.
As a result of an increase in demand for a town's parking facilities, the owners of a car park are reviewing their business operations. A decision has to be made to choose one of the following options:
The 97.5% CI for mean changes in Group B minus mean change in Group A is (-4.7 to -0.9). Suppose we want to compute a two-sided p-value to compare the two groups.
The sample mean of the accounts is found to be y-bar = $94.22, and the sample variance is equal to $455.21. Estimate mu and place a bound on the error of estimation.
Determine the mean and standard error of the x - bar distribution.
MATH1550H: Assignment: Question: A word is selected at random from the following poem of Persian poet and mathematician Omar Khayyam (1048-1131), translated by English poet Edward Fitzgerald (1808-1883). Find the expected value of the length of th..
State the decision rule using the .01 significance level. Compute the value of chi-square. What is your decision regarding H0?
A university has found that 20% of its students withdraw without completing the introductory statistics course. Assume that 20 students have registered for the course this semester.
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