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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
1. a study of commuting times reports the travel times to work of a random sample of 17 employed adults in new york
The sample mean is 4.1 and the sample standard deviation is 1.4. It can be assumed that the population is normally distributed. The degrees of freedom associated with this are?
(a) Let Ni be the number of consecutive days during which component I is responsible for the functioning of the system, for i = 1,2. What is the probability distribution of ?
an important application of regression analysis in accounting is in the estimation of cost. by collecting data on
Test the hypothesis that the Folgers filling machines are not exceeding the specified limit at a=0.1. Find the upper limit for the p-value.
Is 1 significantly low number of adults requiring eyesight? correction?
Compute a 90% confidence interval for the true percent of students who are against the new legislation, and interpret the confidence interval.
a researcher with ministry of transportation is commissioned to study the drive times to work one-way for u.s. cities.
A manufacturer of coil springs is interested in implementing a quality control system to monitor his production process. Construct a time series plot of the data
Inspection of student data generated during pre/post treatment surveys shows that among 10 subjects, 7 had higher scores after an experimental treatment
In a study of patient confidentiality, a large number of pediatricians was surveyed. Each pediatrician was given a "fable" about a female patient less than 18 years old.
A sample size of 50 is selected from a normal distribution having a mean of 95 and a standard deviation equal to 15. What is the probability of selecting a sample having a mean exceeding 100?
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