The standard deviation of the population is commonly used to estimate the standard deviation of the sample.
True
False
when The standard deviation of the population is unknown, then sample std dev is used to estimate the population std dev
so, answer is False
The standard deviation of the population is commonly used to estimate the standard deviation of the...
1.When using a sample standard deviation instead of a population standard deviation to estimate a population mean, more variability is introduced. True False 2.When writing the null hypothesis, an = must ALWAYS be used . True False
We use the sample standard deviation s to estimate for the population standard deviation \sigma. Then s is is properly called the Select one: a. margin of error b. critical value c. level of confidence d. estimator e. None of other answers is necessary true.
The approximate standard error of the difference between population proportions uses the sample proportions to estimate the values of the population proportions when determining the standard deviation. Select one: True False
The t test is used when the standard deviation of the population is known. True False
The sample variance or the sample standard deviation are good approximate of the population variance or standard deviation? True False
Question 1 The T distribution is used when you have the standard deviation of the population (σ). True False
QUESTION 1 In constructing a 95% confidence level estimate of the mean when the population standard deviation () is known what will be your score used in the formula? QUESTION 2 In constructing a 99% confidence level estimate of the mean when the population standard deviation (a) is known what will be your score used in the formula? HINT. Be sure to review page 236 "Finding Z scores from Known Areas - Special Cases and Tabel A-2. QUESTION 3 In...
A population is estimated to have a standard deviation of 12. We want to estimate the population mean within 2 with a 99 percent level of confidence. How large a sample is required?
If x represents a random variable with mean 100 and standard deviation 14, then the standard deviation of the sampling distribution of the means with sample size 49 is 2. true or false If the distribution of the population is bimodal, then the sampling distribution for the sample means for this population with sample size 50 will be unimodal. true of false If the sample size is 49 and the population standard deviation is 28, then the standard deviation of...
A population is estimated to have a standard deviation of 12. We want to estimate the population mean within 2, with a 95% level of confidence. How large a sample is required? (Round up your answer to the next whole number.)