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Let x denote the time (in minutes) that it takes a fifth-grade student to read a certain passage. Suppose that the mean value and standard deviation of x are m = 2 minutes and s = 0.8 minute, respectively.
a. If x is the sample mean time for a random sample of n = 9 students, where is the x distribution centered, and how much does it spread out about the center (as described by its standard deviation)?
b. Repeat Part (a) for a sample of size of n = 20 and again for a sample of size n = 100. How do the centers and spreads of the three x distributions compare to one another? Which sample size would be most likely to result in an x value close to m, and why?
Find the probability of randomly selecting 2 mathematics books and 3 physics books from a box containing 4 mathematics books and 8 physics books. Show your method and your answer.
according to government data 25 of employed women have never been married.a if 10 employed women are selected at
For problems 1 - 2 determine whether the given values are from discrete or continuous data set. 1. A statistics professor counts 3 absent students. Discrete Continuous
a) What is the mean number of stops per hour? b) What is the standard deviation of stops per hour?
suppose a linear programming maximization problem has been solved and the optimal value of the objective function is
Use these data to create a data-based CDF for the distribution of weights for lab animals. Estimate the probability that an animal's weight will be less than 9.5 grams.
The sensitivity of a test is the probability that a person having the disease will test positive (indicating the person has the disease, i.e., it's the probability the test will pick up the fact that a person has the disease).
distracted driving such as texting while driving can increase the chance of a motor vehicle crash. a new report states
If you plan to reject the first card offered, and to then accept the second card if and only if its value is greater than the value of the first card, what is the probability that you will accept the highest valued card?
Briefly identify and contrast the methods used by the psychoanalytic perspective, the humanistic perspective, and the trait perspective to assess personality.
Standard deviation 13. in a random sample of 32 womrn aged 18-24, find the probability that the average systolic blood pressure is between 110 and 120 mm hg.
find an equation of the tangent plane and find symmetric equations of the normal line to the surface zxy at the point
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