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Marketing companies have collected data implying that teenage girls use more ring tones on their cellular phones than teenage boys do. In one particular study of 40 randomly chosen teenage girls and boys (20 of each) with cellular phones, the mean number of ring tones for the girls was 3.2 with a standard deviation of 1.5. The mean for the boys was 1.7 with a standard deviation of 0.8. Conduct a hypothesis test to determine if the means are approximately the same or if the girls' mean is higher than the boys' mean.
In a certain country, the distribution of the number of cases of tetanus reported during a single month is Poisson with parameter lambda=6.5. If we are going to draw a sample of size 60 from this population and calculate the sample mean, what is t..
manufacture of a certain component requires three different machining operations. machining time for each operation has
Calculate the correlation coefficient for the given data? Interpretation of the correlation coefficient?
A computer password consists of four characters. The characters can be one of the 26 letters of the alphabet. Each character may be used more than once.
1. What are the uses of the multivariate normal distribution? Why is it needed? 2. How many discriminant functions may be found signi?cant in classifying an observation into one of four groups?
Let X be the number of successes at UZ. What is the distribution of X? What is the asymptotic distribution of your estimate from (d)?
The article "Fish Oil Staves Off Schizophrenia" (USA Today, February 2, 2010) describes a study in which 81 patients age 13 to 25 who were considered
A researcher wants to determine if different forms of regular exercise alter HDL levels in obese middle aged males between the ages of 35 and 45. What is the null hypothesis equation for this experiment
2005 was a record year for hurricane devastation in the United States (San Luis Obispo Tribune, November 30, 2005). Of the 26 tropical storms and hurricanes
Fifty-six percent of electronicgamers play games online, and sixty-four percent of thosegamers are female.
suppose a random variable x has density fx c x 3 if x equal or great than 10 else where c is a constant.a what is the
use inductive reasoning to answer. if you add two consecutive triangular numbers what kind of figurate number do you
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