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A dependent samples t test is typically more powerful than an independent samples t test because ?
a. reduces participant/subject variability between groups.b. has much higher degree of freedomc. uses twice as many scores in all calulations.d. has more participants in the study.
A sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of $2.78.
A random sample of 20 single men was asked if they would welcome a woman taking the initiative in asking for a date. What is the probability that
The manufacturer of an airport baggage scanning machine claims it can handle an average of 530 bags per hour.
Locate value of the population mean in your sketch and make an estimate of the standard deviation
A journal polled its readers to determine the proportion of wives who, if given a second chance, would marry their husband again.
The number of viewers of American Idol has a mean of 29 million with a standard deviation of 5 million. Assume this distribution follows a normal distribution.
A state survey investigates either the proportion of 8percent for employees who commute by car to work is higher than it was five years ago.
How to explain the influences on z-scores with constant variables in hypothesis tests with
Is there a statistically significant difference between the bowling averages of male nurses and those of businessmen, if last year's league play produced the following data
Test the hypothesis that the annual income of teachers in areas of more than 500,000 is significantly more than those in areas of less than 100,000. Use the 5% level of risk.
The following ANOVA summary data are the result of a regression with sales per year (dependent variable) as a function of promotion expenditures per year (independent variable) for a toy company.
Constructing a scatter plot and determining correlation. a. display the data in a scatter plot, b. calculate the correlation coefficient f, and c. make a conclusion about the type of correlation.
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