Number of accidents daily (x).            P(x=xi) o.                                                               0.10 1.                                                                0.20 2                                                                0.45 3                                                                0.15 4                                                                0.05 5                                                                0.05  compute the standard deviation

A random sample of size n = 670 from a population whose parameter is p 0.71. = a. What is the mean of the distribution of sample proportions? Round the answer accurate to 2 decimal places. b. What is the standard deviation of the distribution of sample proportions? Round the answer accurate to 2 decimal places. σ

ats 2. In the mid-19th century, Sir Francis Galton demonstrated, through extensive data collection, that many human characteristics such as height and IQ are distributed throughout the entire population in accordance with the normal distribution. Galton recorded the heights of 8585 men in Great Britain. This forms a normal distribution with a mean of 67 inches and standard deviation of 2.5 inches. (a) Graph this normal distribution and label the x-axis. (b) What proportion of these men were between 66 and 68 inches tall? belool vin (c) What fraction of the adult male population in Great Britain was within one standard deviation of the mean height? [Use the normal distribution function in Excel, not the Empirical Rule] (d) What height corresponds to the 95th percentile in the Galton study?

Testing:H0:μ=4.98H1:μ>4.98Your sample consists of 35 subjects, with a mean of 7 and standard deviation of 4.44.Calculate the test statistic, rounded to 2 decimal places. t=

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This Is A REVIEW! Please help and show work on paper

A randomly selected sample of n = 55 individuals over 65 years old takes a test of memorization skills. The sample mean is x = 53, and the standard deviation is s = 6.9. Give the numerical value of the standard error of the mean, s.e. (Round your answer to two decimal places.) s.e.(x) =

nts The level of nitrogen oxides (NOX) in the exhaust of a particular car model varies with mean 0.7 grams per mile and standard deviation 0.17 grams per mile. (a) What sample size is needed so that the standard deviation of the sampling distribution is 0.01 grams per mile? Hint You already have an equation that gives a relationship between the population standard deviation, the sampling distribution's standard deviation, and the sample size. Do a little algebra to solve that equation for the sample size. ANSWER: (b) If a larger sample is considered, the standard deviation for æ would be (NOTE: Enter "SMALLER","LARGER" or "THE SAME without the quotes.)

A B. The mean blood cholesterol level for all men aged 20 to 34 years is p = 188 mg/dl with a standard devlation of a = 41 mg/dl. We suspect that the mean for cross-country runners is lower. A random sample of 20 cross-country runners yielded a mean level of 172 mg/di. SHOW YOUR FORMULAS AND ALL WORK ON THIS PAGE What is the standard deviation of the mean length X? Standard Deviation 41.0000

To estimate the mean score ?μ of those who took the Medical College Admission Test on your campus, you will obtain the scores of an SRS of students. From published information you know that the scores are approximately Normal with standard deviation about 6.6.6.6. You want your sample mean ?⎯⎯⎯x¯ to estimate ?μ with an error of no more than 0.8 points0.8 points in either direction.   What standard deviation must x¯ have so that 99.7% of all samples give an x¯ within 0.8 points of μ? Use the 68-95-99.7 rule. Give your answer to four decimal places. standard deviation of x¯:   How large an SRS do you need in order to reduce the standard deviation of x¯ to the value you found? Give your answer rounded up to the nearest whole number. SRS size: