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A construction company is designing the world's highest commercial building at the Michigan Avenue in Chicago. In order to support the gigantic structure, its civil engineering team needs to develop strong concrete foundation. The team recently synthesized a new concrete mixture which compressive strength is normally distributed with mu=30000psi and sigma=6000psi. Find the probability that a random sample of n=20 specimens will have a sample mean compressive strength that falls in the interval from 27000 to 31500 psi.
let x1 and x2 be two independent random variables each representing the number of heads in two flips of a fair coin.
a normally distributed random variable x has the expectation x -15 and standard deviation 10. compute the table for
A correlation coefficient computed for n=18 and a=0.10 is r=0.692. . Using the t -test for the correlation coefficient, what are the critical values?
question a study is conducted to determine if time of day has any effect on test grades. an introductory psychology
We are asked to test for independence between age (i.e., adult and teen) and drink preferences.
Use the following data to write the normal equations of the linear regression between Y and X, and find the least squares regression.
The p-value of the test is closest to:
According to a recent survey, Americans get a mean of 7 hours of sleep per night. A random sample of 50 students at West Virginia University revealed the mean number of hours slept last night was 6 hours and 48 minutes
a study is made of residents in phoenix and its suburbs concerning the proportion of residents who subscribe to
you take a trip by air that involves three independent flights. if there is an 82 percent chance each specific leg of
You obtain the data shown below for 30 girls with anorexia who were treated with psychodynamic therapy. Using the data below and the data above compare the outcomes for CBT and psychodynamic therapy.
any conclusion drawn for the t-test statistical process is only as good as the research question asked and the null
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