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A group of students at a school takes a history test. The distribution is normal with a mean of 25, and a standard deviation of 4.
(a) Everyone who scores in the top 30% of the distribution gets a certificate. What is the lowest score someone can get and still earn a certificate?
(b) The top 5% of the scores get to compete in a statewide history contest. What is the lowest score someone can get and still go onto compete with the rest of the state?
Teenage pregnancies. The U.S. National Center for Health Statistics reports for 2006 the distribution of teenage pregnancies by age range and ethnicity of the mother.
the central limit theorem helps researchers answer questions abouta. sample means for small sample sizes.b. sample
HEIGHTS OF WOMEN The heights of 4000 women who participated in a survey were found to be normally distributed with a mean of 64.5 in. and a standard deviation.
a gymnast m 70 kg is stationary in the inverted iron cross position. his arms are at 20 degrees from horizontal with
explain what is wrong with each of the followinga. you can use a significance test to evaluate the hypothesis hophat0.6
Consider that you are a line manager in your current Corporation. There is a 0.50 probability that you will be promoted this year. There is a 0.65 probability that you will get a promotion or a raise. The probability of getting a promotion and a r..
A coin is tossed 100 times. The difference "number of heads - number of tails" is like the sum of 100 draws from one of the following boxes. which one, and why?
Determine a value of c such that the random variable cY win have a X2 distribution. ]0. If a random variable X has a X l distribution with " degrees of freedom
Use the argument forms presented in this section to structure the selections as specifically named arguments.If the death penalty deters one person from becoming a murderer, it is effective.
Fit the first-order model to the data.- Calculate the residuals and construct a residual plot versus y^.- What does the plot from part b suggest about the variance of y?
Use a significance level of 0.05. Comment on your conclusion: Are you saying that the percentage of dangerous fish is definitely 20%? Explain.
There is an advantage in stating the hypothesis both in the null and in the alternative; it adds clarity to our thinking of what we are testing. Explain.
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