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...
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 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?
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.)
A population is estimated to have a standard deviation of 10. We want to estimate the population mean within 2, with a 95% level of confidence. How large a sample is required? a. 98 b. 97 c. 96 d. 95
A population has a mean of 200 and a standard deviation of 50. A sample of size 100 will be taken and the sample mean will be used to estimate the a. What is the expected value of x? b. What is the standard deviation of x? c. 18. population mean Show the sampling distribution of x What does the sampling distribution of i show?
To estimate the mean of a normal population whose standard deviation is 36, with a margin of error equal to 3 and confidence level 95% requires a sample size of at least (report your answer in integers)