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tporter00
15.01.2020 •
Mathematics
Based upon extensive data from a national high school educational testing program, the standard deviation of national test scores for critical reading was found to be 115 points. if a sample of 500 students are given the test, what would be the standard error of the mean? (rounded to the nearest 100th)
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Ответ:
The standard error of the mean is 10.11 points
Step-by-step explanation:
Standard error of mean = t×sd/√n
sd = 115 points, n = 500, degree of freedom = n-1 = 500-1 = 499, assuming a 95% confidence level, t-value corresponding to 499 degrees of freedom and 95% confidence level is 1.96501
Standard error of mean = 1.96501×115/√500 = 10.11 points (to the nearest 100th)
Ответ:
4578.12 ft³
Step-by-step explanation:
Volume of a cylinder is: V = πr²h
Insert the information into the formula: V = (3.14)(81)(18) = 4578.12