请在下方输入要搜索的题目：

A sample of 20 observations has a standard deviation of 3. The sum of the squared deviations from the sample mean is:
选项：

A:20.
B:23.
C:29.
D:60.
E:171.

发布时间：2024-06-06 08:59:54

推荐参考答案 ( 由搜题小帮手官方老师解答 )

联系客服

答案：

以下文字与答案无关

提示：有些试题内容显示不完整,文字错误或者答案显示错误等问题，这是由于我们在扫描录入过程中机器识别错误导致,人工逐条矫正总有遗漏，所以恳请广大网友理解。

相关试题

1.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
2.The standard deviation is 选项： A、Based on squared deviations from the mean. B、In the same units as the mean. C、Uses all the observations in its calculation. D、All of the above.
3.A population distribution is normal with a mean of 18 and standard deviation of 4. A sample of 16 observations is selected and a sample mean computed. What is the probability that the sample mean is more than 18?? 0.0180.51.0
4.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.
5.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
6.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.
7.Which of the following is required to compute the standard error of a sample meanusing the bootstrap resampling method? 选项： A:The mean of each resample B:The mean of the original sample C:The standard deviation of the original sample
8.The standard error of the meanA.is never larger than the standard deviation of the population.B.decreases as the sample size increases.C.measures the variability of the mean from sample to sample.D.All of the above.
9.The standard error of the mean is:选项： A:the standard deviation of the sampling distribution of sample means.; B:always normally distributed.; C:sometimes less than 0.; D:the variance squared.
10.Suppose a sample of n = 50 items is drawn from a population of manufactured products and the weight, X, of each item is recorded. Prior experience has shown that the weight has a probability distribution with mean 6 ounces and standard deviation 2.5 ounces. Which of the following is true about the sampling distribution of the sample mean if a sample of size 15 is selected？选项： A:The mean of the sampling distribution is 6 ounces.; B:The standard deviation of the sampling distribution is 2.5 ounces.; C:The shape of the sample distribution is approximately normal.; D:None.
11.The Central Limit Theorem concerns the sampling distribution of the: 选项： A: sample standard deviation. B: population mean. C: sample mean.
12. 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.
13.A population has a known mean of 100. Suppose 36 samples are randomly drawn from this population with replacement. The observed mean is 97.8 and the standard deviation is 10. The standard error of the sample mean is closest to: 选项： A: 0.8165. B: 1.667. C: 1.8165.
14.The variance of a stock's returns can be calculated as the: 选项： A、average value of deviations from the mean. B、average value of squared deviations from the mean. C、square root of average value of deviations from the mean. D、sum of the deviations from the mean.
15.We wish to develop a confidence interval for the population mean. The population follows the normal distribution. We collect a random sample of 10 observations and the sample standard deviation is 3. We decide to use the 95 percent level of confidence. The margin of error for the confidence interval is:选项： A:± 2.146.; B:± 1.859.; C:± 1.960.; D:± 2.262.
16.We wish to develop a confidence interval for the population mean. The population follows the normal distribution. We collect a random sample of 10 observations and the sample standard deviation is 3. We decide to use the 95 percent level of confidence. The margin of error for the confidence interval is:选项： A:± 1.859.; B:± 1.960.; C:± 2.262.; D:± 2.146.
17.If all possible samples of size n are drawn from an infinite population with a mean of 60 and a standard deviation of 8, then the standard error of the sample mean equals 1.0 only for samples of size 64.选项： A:对 B:错
18.When sampling from a population of measurement data. If the sample size is increased, there will be （）选项： A:increase in standard deviation B:decrease in standard deviation C:increase of standard error D:decrease of standard error
19.Which of the following statements about the arithmetic mean is not always correct?选项： A:The sum of the deviations from the mean is zero. B:Half of the observations are on either side of the mean. C:The mean is a measure of the middle (centre) of a distribution. D:The value of the mean times the number of observations equals the sum of all of the observations.
20. At a computer manufacturing company, the actual size of computer chips is normally distributed with a mean of 1 centimeter and a standard deviation of 0.1 centimeter. A random sample of 12 computer chips is taken. What is the standard error for the sample mean? 选项： A、0.029 B、0.050 C、0.091 D、0.120
21.The wildlife department has been feeding a special food to rainbow trout fingerlings in a pond. Based on a large number of observations, the distribution of trout weights is normally distributed with a mean of 402.7 grams and a standard deviation of 8.8 grams. What is the probability that the mean weight for a sample of 40 trout exceeds 405.5 grams? 选项： A:0.0222 B:1.0 C: 0.5 D: 0.3782
22.The amount of time a bank teller spends with each customer has a population mean of 3.1 minutes and standard deviation of 0.4 minute. If you select a random sample of 16 customers,A) What the probability that the mean time spent per customer is at least 3 minutes?B) There is an 85% chance that the sample mean is less than how many minutes?C) What assumption must you in order to solve a) and b)?D) If you select a random sample of 64 customers, there is an 85% chance that the sample mean is less than how many minutes?
23.We wish to develop a confidence interval for the population mean. The population standard deviation is known. We have a sample of 40 observations. We decide to use the 92 percent level of confidence. The appropriate value ofzis:? 2.58.1.75.1.65.1.96.
24.The smaller the Standard error of sample mean is, （）选项： A:the smaller the variation of the observed individual B:the larger the variation of the observed individual C:the greater the sampling error is D:the greater the reliability of estimating the population mean from the sample mean

没有账号？点我注册

分理处来此好人好事长大成人亮点有报酬外洋公平竞争军机首发

立即注册

已购买搜题包，但忘记账号密码？

登录即同意《服务协议》及《隐私政策》

立即登录

登录即同意《服务协议》及《隐私政策》

A sample of 20 observations has a standard deviation of 3. The sum of the squared deviations from the sample mean is:选项： A:20. B:23. C:29. D:60. E:171.

A sample of 20 observations has a standard deviation of 3. The sum of the squared deviations from the sample mean is:
选项：

A:20.
B:23.
C:29.
D:60.
E:171.