Study Giude for Business Statistics

1. As the degrees of freedom increase, the t distribution approaches the b. normal distribution 2. If the margin of error in an interval estimate of μ is 4.6, the interval estimate equals b. [pic] 3. The t distribution is a family of similar probability distributions, with each individual distribution depending on a parameter known as the c. degrees of freedom 4. The probability that the interval estimation procedure will generate an interval that does not contain the actual value of the population parameter being estimated is the a. level of significance 5. To compute the minimum sample size for an interval estimate of μ, we must first determine all of the following except d. degrees of freedom 6. The use of the normal probability distribution as an approximation of the sampling distribution of [pic] is based on the condition that both np and n(1 – p) equal or exceed b. 5 7. The sample size that guarantees all estimates of proportions will meet the margin of error requirements is computed using a planning value of p equal to b. .50 8. We can reduce the margin of error in an interval estimate of p by doing any of the following except b. increasing the planning value p* to .5 9. In determining an interval estimate of a population mean when σ is unknown, we use a t distribution with c. n − 1 degrees of freedom
10. The expression used to compute an interval estimate of μ may depend on any of the following factors except d. whether there is sampling error
11. The mean of the t distribution is a. 0
12. An interval estimate is used to estimate d. a population parameter
13. An estimate of a population parameter that provides an interval believed to contain the value of the parameter is known as the. b. interval estimate
14. As the sample size increases, the margin of error b. decreases
15. The