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A philosophy professor has found a correlation of .80 between number of hours students study for exams and their exam performance. During the time he collected date students studied for an average of 10 hours with a standard deviationof 2.5 and scored an average of 80 points with a standard deviation of 7.5
A) create a linear model to estimate the number of points students will score on the next exam from the number of hours the student studies
B) If a student studies for 15 hours, what score should the student expect on the next exam?
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List one unclear concept regarding regression and provide an example from your personal or work life where regression could be used to show a relationship between two variables.
How many of these new cardholders would you expect to default? What is the standard deviation?
If and are the proportions of all college males and females correspondingly, who worked last summer, the z statistic (±0.01) for a test comparing the proportions of college men and women who worked last summer is??
Use Chebyshev's theorem to find what percent of the values will fall between 241 and 349 for a data set with a mean of 295 and standard deviation of 18.
Assuming that all other variables are held constant describe how value of z is influenced by each of the following: If alpha level is changed from a = .05 to a = .01. What occurs to boundaries for the critical regions?
What is the probability for the given frequency distribution?
One table has a standard deviation of $50 while the other has a standard deviation of $150. What conclusion can be drawn from the data?
A store manager wishes to find out whether there is a relationship between the age of her employees and the number of sick days they take each year. The data for the sample are shown below:
Given the following data, 1) how do you make Excel create a scatter diagram for you? 2) If you were to draw a line through the points, how straight would the line be?
Due to financial hardship, the Nyke shoe company feels they only need to make one size of shoes, regardless of gender or height. They have collected data on gender, shoe size, and height
Jill constructs a test to measure a personality state. The test consists of multiple items which sum up to indicate the degree of the trait that is present.
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