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Comparing the answers to (a) and (b), for what range of values of t statistics would the hypothesis test conclusion differ between using the t or normal critical values? How practically important does this difference appear to be? Explain.
Given that n=60, H0: mean=0, HA: mean>0, level of significance=0.05 and:
(a) Using t distribution in excel, critical value=1.671
(b) Using the table(since the df>30, so we use df=infinity), critical value=1.645
Suppose that on a certain examination in advanced mathematics, students from university A achieve scores which are normally distributed with a mean
Describe a situation in which correlation analysis or regression analysis can be (or was) misused to explain cause and effect relationship in a case of fortuitous correlation.
The procedure square-list takes a list of numbers as argument and returns a list of the squares of those numbers. (square-list (list 1 2 3 4)) (1 4 9 16) Here are two different definitions of square-list. Complete both of them by filling in the mi..
the time it takes a cell to divide called mitosis is normally distributed with an average time of one hour and a
the average salary of a male full professor at a public four-year institution offering classes at the doctoral level is
The researchers blinded both the dog handlers and the experimental observers to the identity of the breath samples.
Evaluate each expression-Diameter of a circle. If the diameter of a circle is 1.3 * 10^-12 meters, then what is the radius?
If at least 11 questions must be answered correctly to pass the test, what is the probability that the student passes the test by purely guessing?
1. The refrigerators in seven households need repair, and each owner calls the town handyman on a randomly chosen day of the week. What is the prob- ability that the handyman gets at least one day of the week off?
suppose a manufacturing company makes a certain item. the time to produce each item is normally distributed around a
suppose you are interested in an investment with an uncertain return. you think that the return could be modeled as a
the time in minutes between telephone calls at an insurance claims office has the expo- nential probability
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