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standard deviation
发布时间:
2024-04-24 14:24:38
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相关试题
1.
Suppose that the distribution of a set of scores has a mean of 47 and a standard deviation of 14. If 4 is added to each score, what will be the mean and the standard deviation of the distribution of new scores? 选项: A: mean 51 Standard Deviation 14; B: mean 51 Standard Deviation 18; C: mean47 Standard Deviation 14; D: mean47 Standard Deviation16
2.
There are two series A and B, if the range of A is larger than that of B, then (d) 选项: A、The standard deviation of A must be greater than that of B B、The standard deviation of A must be less than that of B C、The standard deviation of A must be equal to that of B D、There is no relationship between the range and the standard deviation
3.
The value of the standard deviation of all possible sample means, called the ( ). 选项: A、standard erro B、standard error of the mean C、standard error of the standard deviation D、variation
4.
root-mean-square deviation, standard deviation
5.
standard deviation
6.
In finding a confidence interval for the population mean, the population standard deviation should be used if it is known. If the population standard deviation is not known, then it should be estimated with _______.选项: A:the sample variance B:the sample standard deviation C:the range D:the mean
7.
Coefficient of variation= Standard deviation /
8.
Standard deviation and beta both measure risk, but they are different in that beta measures ( ) 选项: A、both systematic and unsystematic risk. B、only systematic risk while standard deviation is a measure of total risk. C、only unsystematic risk while standard deviation is a measure of total risk. D、both systematic and unsystematic risk while standard deviation measures only systematic risk.
9.
Assuming the annual standard deviation of market returns is 14.5%, the two-year standard deviation is ___.选项: A:53.85%; B: 20.51% ; C:29%; D:76.26%
10.
An analyst stated that the mean of the standard normal distribution always has a value of zero but that the standard deviation of the standard normal distribution can take on a value from 0 to 1. 0. Is the analyst correct with respect to the value of the standard normal distribution’s: mean Standard deviation ① 选项: A、No No ② B、No Yes ③ C、Yes No A.① D、② E、③
11.
A sample of size n is selected at random from an infinite population. As n increases, which of the following statements is true?选项: A:The population standard deviation decreases. B:The standard error of the sample mean decreases. C:The population standard deviation increases. D:The standard error of the sample mean increases.
12.
Consider an infinite population with a mean of 100 and a standard deviation of 20. A random sample of size 64 is taken from this population. The standard deviation of the sample mean equals 2.5.选项: A:对 B:错
13.
The numerical value of the standard deviation can never be negative.
14.
Consider an infinite population with a mean of 100 and a standard deviation of 20. A random sample of size 64 is taken from this population. The standard deviation of the sample mean equals 2.5. 选项: A:对 B:错
15.
The descriptive measure of dispersion that is based on the Concept of a deviation about the mean is( ) 选项: A:the range B:the interquartile range C:the absolute value of the range D:the standard deviation
16.
Given the following information: Standard deviation = 8 Coefficient of variation = 64% The mean would then be
17.
The standard error of the mean is:? the standard deviation of the sampling distribution of sample means.the variance squared.always normally distributed.sometimes less than 0.
18.
The standard recommends that the arithmetic mean deviation Ra of the contour be preferred because of its simple measurement method.
19.
As the size of the sample is increased, the standard deviation of the sampling distribution of the sample mean for a normally distributed population will stay the same.
20.
If the standard deviation of annual returns is 19.8 percent and the number of years of observation is 107, what is the standard error?选项: A:4.23 percent; B:1.91 percent; C:0.47 percent; D:19.8 percent
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