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A professor hypothesizes that students who earn a C or better in her class spend more time outside of class studying than students who receive a D or F. She collects the following data from two samples of students. What does she conclude?
Number of hours studying per week for C or better students: 8, 4, 4, 2, 1, 5, 3, 2, 3
Number of hours studying per week for D or F students: 6, 2, 1, 0, 3, 2, 1
the life of a recirculating pump follows a weibull distribution with parameters beta 2 and delta 700 hours.a
1) What is the maximum number of students who play all the games? 2) What is minimum number of students who play all three games? 3) What is the maximum number of students who play at least one game?
When the data are consistent with the direction of the alternative hypothesis for a one-sided test, the p-value for the corresponding two-sided test is double.
Suppose that lifetimes of light bulbs produced by a certain company are normal random variables with mean 1000 hours and standard deviation 100 hours
the per-store daily customer count i.e. the mean number of customers in a store in one day for a nationwide
Random walk inside circles. Fix r > 0. Draw a circle centered at (0, 0) with radius r, Let (X1, Y1) be picked uniformly at random from the area inside.
A psychologist is interested in knowing whether adults who were bullied as children differ from the general population in terms of their empathy for others.
How would you develop the multiple regression equation using stepwise multiple regression?
An optical company uses a vacuum deposition method to apply a protective coating to certain lenses. The coating is built up one layer at a time.
if x1 and x2 are independent random variables x1 has a chi-square distribution with 3 degrees of freedom and x1 x2 has
A student survey. Tonya wants to estimate what proportion of the students in her dormitory like the dorm food. She interviews an SRS of 50 of the 175 students.
A particular type of electronic component for use in PCs is mass produced and subject to quality control checks since it is known that 2% of all components produced in this way are defective.
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