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1.
An investigator wants to test if there is a difference in endotoxin levels in children who are exposed to endotoxin as a function of their proximity to operating farms.
The following are endotoxin levels in units per milligram of dust sampled from children's mattresses, organized by children's proximity to farms.
he next 20%, a B; the next 40%, a C; the next 21%, a D; and the bottom 10%, an F. What average must you exceed to receive a grade of C or better?
It is estimated that 2% of the athletes competing in a large tournament are users of an illegal drug to enhance performance. The test for this drug is 95% accurate. What is the probability that an athlete who tests positive is actually a user?
Describe the sample distribution of p-hat, the sample proportion of college students with cell phones who send or receive text messages with their phones.
A radio station that plays classical music has a "By Request" program each Saturday night. The percentage of requests for composers on a particular night are listed below:
What symbol is used to represent the mean of the sampling distribution of y-(ybar)? Explain and what symbol is used to represent one value from the sampling distribution of y-(ybar)? Explain
Using ANOVA, determine if there is a significant difference in the six year graduation rate by type.
The probability distribution of the daily demand for a product is shown below. What is the expected number of units demanded per day? Determine the variance and the standard deviation.
The calculated Z test statistic is a positive value that leads to a p-value of .045 for the test. If the significance level (α) is .01, the null hypothesis would be rejected.
A computer diskette manufacturer is concerned that some diskettes have bad sectors that would cause a diskette to hold less information than it was intended to hold.
The response variable is the change in cholesterol level after two months of treatment. An analysis of variance will be used to compare the three treatments. What null hypothesis is tested by this ANOVA F-test?
2 prizes of $1250, and 1 prize of 3000. Assume that 22,000 lottery tickets are issues and sold for $1. What is the lottery's expected profit per ticket?
test the hypothesis that the intake of linoleic acid in this group is lower than that of the general population. Also, compute a p-value for the hypothesis test.
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