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What's the line? You use the same bar of soap to shower each morning. The bar weighs 80 grams when it is new. Its weight goes down by 5 grams per day on the average. What is the equation of the regression line for predicting weight from days of use?
What sample size would be required to obtain the error of ±10 square millimeters with 99 percent confidence?
If an employee is selected at random, what is the probability that the employee is female or works as a member of the administration?
The determinant coefficient (R2) and comment on the result. Predict the demand (y) when the budget for television advertising (x) equals 10.
Of the adult books, 70 are nonfiction while 60 of children's books are nonfiction. If the book is selected at random, determine the probability that is is?
Use the relative frequency approach to construct a probability distribution for the number of tests taken.
refer to the baseball dataset provided on the authors website. over the last 10 years the mean attendance per team
Interpret the correlation between each set of variables.
suppose the results of the analyses in problem 15-17 are reported and criticized because the participants were not
Find the standard score (z-score) for students who study the following hours in a particular week. Round Z to the nearest hundredth and interpret the meaning of each answer as it pertains to this problem.
a psychologist is conducting a study in which 30 students attend workshops by the speaking center for one hour per
A baseball player gets a hit in 30 out of 100 times at bat. What is the probability that he gets a hit in his next at bat?
Critically discuss some examples of descriptive statistics? Why are they used in research? What is a confidence interval?
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