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1. Understanding Standard Deviation A sample consists of 10 test scores that fall between 70 and 100 inclusive. What is the largest possible standard deviation?
2. Phony Data? For any data set of n values with standard deviation s, every value must be within s 2n 2 1 of the mean. A statistics teacher reports that the test scores in her class of 17 students had a mean of 75.0 and a standard deviation of 5.0. Kelly, the class's self-proclaimed best student, claims that she received a grade of 97. Could Kelly be telling the truth?
Ran parts and found 1% defective(1 out of 100). Made a change to the process and want to rerun parts. How many parts do we need to check (and find 0% defective) for a 90% confidence factor
Southeastern Bell stocks a certain switch box at its central warehouse for supplying field service offices. The yearly demand for these connectors is 15,000 units.
The 50 members of the placebo group had blood pressure lowered by an average of 15 points with standard deviation 8 points. To analyze this information we will use a, When testing whether or not the increases in spending are different, the test is ..
For each of the following problems, assume that the homogeneity of variance assumption has not been met and that you will need to use the adjusted Welch statistic.
last school year the student body of a local university consisted of 30 freshmen 24 sophomores 26 juniors and 20
A manufacturing process produces on the average two defective items per hour. What is the probability that after a defective item: One hour will pass before the next defective item and One-half hour will pass?
Use α = 0.10 and assume that the population is normally distributed. Write a paragraph that interprets the test's decision.
Get a test statistic and p -value. Interpret results at α = .01.
Let the random variable X denote the number of emergency calls received by the campus police office each day. The probability mass function of X is given by:
The following data represent 25 successive subgroup averages and moving averages of span size 5 of these subgroup averages. The data are generated by a process that, when in control, produces normally distributed items having mean 30 and vari..
Determining the probability that the two choose the same number?
what are the appropriate h0 and ha for each of the following research studies? in addition note whether the hypothesis
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