а a y = 1.20 (+0.02) x Absolute standard deviation = Coefficient of variation = Result = 10-8-3.60(+0.2) x× 10-⁹ % H
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- From generation to generation, the mean age when smokers first start to smoke varies. However, the standard deviation of that age remains constant at around 2.1 years. A survey of 38 smokers of this generation was done to see if the mean starting age is at least 19. The sample mean was 18.1 with a sample standard deviation of 1.3. Do the data support the claim at the 5% level? (i) Alpha (Enter an exact number as an integer, fraction, or decimal.)? =A variable of two populations has a mean of 45 and a standard deviation of 24 for one of the populations and a mean of 45 and a standard deviation of 40 for the other population. Moreover, the variable is normally distributed on each of the two populations. Complete parts (a) through (c). a. For independent samples of size 16 and 25, respectively, determine the mean and standard deviation of x1−x2. The mean of x1−x2 is __________ (Type an integer or a decimal. Do not round.) The standard deviation of x1−x2 is ____________ (Round to four decimal places as needed. b. Can you conclude that the variable x1−x2 is normally distributed? Explain your answer. Choose the correct answer below. A. Yes, since the variable is normally distributed on each of the two populations, x1−x2 is normally distributed. B. No, since x1−x2 must be greater than or equal to 0, the distribution is right skewed, so cannot be normally distributed. C. Yes, x1−x2 is always normally…A variable of two populations has a mean of 20and a standard deviation of 18 for one of the populations and a mean of 20 and a standard deviation of 40 for the other population. a. For independent samples of size 9 and 25, respectively, find the mean and standard deviation of x1−x2. (Assume that the sampling is done with replacement or that the population is large enough.) The mean of x1−x2 is 0 (Type an integer or a decimal. Do not round.) The standard deviation of x1−x2 is ___________. (Round to four decimal places as needed.)
- Suppose X is Normally distributed with mean 25 and standard deviation 4. Suppose Y is Normally distributed with mean 30 and standard deviation 5. The standard deviation of 0.25X - Y isThe regression line for Y vs X is given by Y = 0.82X + 59.1. The standard deviations for X and Y are 1.5 and 2.2 respectively. Suppose now we construct a regression line that uses Y to predict X. The predicted average increase of X when Y is increased by 1 unit is ______________. (Give your answer correct to 2 decimal places.)X is normally distributed with mean 4 and standard deviation 1. Y is independent and normally distributed with mean 3 and standard deviation 3. What is P(Y + X > 8)?
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- Suppose the mean monthly return on a T-Bill is 0.5% with a standard deviation of 0.58%. Sup-pose we have another investment Y with a 1.5% mean monthly return and standard deviationof 6%. Which of the two investments o ers less risk in terms of investment.Having the variation data regression line r=0.931 and the calculated coefficient of determination of 0.867.. And explained variation of the data of 86.7%.. About the unexplained variation? [ ] % of the variation is unexplained and is due to other factors or to sampling error. (Round to one decimal place as needed.)Mean of x And standard deviation of x