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The simplest useful numerical description of a distribution consists of measure of center and measure of spread. The p th percentile of a distribution is the value such that p percent of the observations fall at or below it. Example: The Median is the 50th percentile. Q: Why is not the Mean the 50th percentile?
A supplier of 3.5" disks clams that only 1% of the disks are defective. In a random sample of 600 disks, it is found that 3% are defective, but the supplier claims that this is simply a sample fluctuation. At the 0.01 level of significance, test t..
Rewrite the equation in slope-intercept form. Then identify the slope and the y-intercept of the line.
A rental agent claims that the mean monthly rent,u, for apartments on the east side of town is less than$725 . A random sample of 13 monthly rents for apartments on the east side has a mean of$714
Your high school graduating class had 564 members. Thirty-three percent of these are expected to attend college. The probability that less than 160 will attend college is
The National Survey of Student Engagement (NSSE) surveys freshmen and seniors about their level of engagement in campus and classroom activities that enhance learning.
The results of inspection of DNA samples taken over the past 10 days are given below. Sample size is 100.
Parameter of interest is mean score in this population. Sample is an SRS of size n = 4 drawn from population. Determine the mean of 10 scores in the population.
Ffind the mean, variance and standard deviation of binomial distribution? what valuses of the random variable X would you consider unusual?
Place the steps below in the correct order for the construction of a control chart.
Ace Machine Works estimates that the probability its lathe tool is properly adjusted is 0.8. When the lathe is properly adjusted, there is a 0.9 probability that the parts produced pass inspection.
Test the claim by random sampling 60 hgh school boys. Researcher found 54 boys have a cell phone at a = 0.01. Should the claim be rejected?
According to the U.S National Center for Health Statistics, the mean height for adult American males is mu = 65.5 inches. Assume the heights are normally distributed with standard deviation of sigma = 3.2.
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