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A reasearcher is running a chi-sq test. She would like to test her hypothesis at the alpha=.05 and finds that her research situation has 5 degrees of freedom. What is value for the chi-sq critical?
The Motion Picture Associa- tion of America studies the ethnicity of moviegoers to understand changes in the demographics of moviegoers over time. Here are the numbers of moviegoers (in millions) classified as to whether they were Hispanic, Africa..
The U.S. Department of Transportation defines an airline flight as being "on-time" if it landed less than 15 minutes after the scheduled time shown in the carrier's Computerized Reservation System.
Suggest one psychological research question that could be answered by each of the following types of statistical test:
You then sort by the random numbers in ascending order. Finally, you take the first 50 sorted employees as your sample. Does this approach constitute a statistical or a nonstatistical sample?
This set of height measurements are recorded in centimeters. Answer the following questions using the Histogram Applet.
(a) What is the average cost per hour if Mary is hired? If Alice is hired? (b) Find C if the average cost per hour is the same for Mary and Alice.
i what is the sampling distribution of a sampe mean for a normally distributed random variable.ii if a variable iq is
What is the probability that between 10:00 and 10:30 the switchboard will receive more than 9 calls but fewer than 15 calls?
Assuming that the variability is unchanged (i.e., σ = 6), is there sufficient evidence to suggest that the strength of the product has increased at the 1% level of significance?
A coin is to be flipped three times. List the possible outcomes in the form (result on toss 1, result on toss 2, result on toss 3). Compute the probability of the complement of event A, event B, and event C.
a particular investment fund is comprised of more than 1000 companies world-wide that are considered to be socially
In a class of 40, 16 driver a car made outside the United States. What is the confidence interval for the total population of students at the 95% level?
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