A confidence interval utilizes the ___ of a sample as a ____ estimate of the pop

Question

A confidence interval utilizes the ___ of a sample as a ____ estimate of the population mean. Standard deviation; point mean; point Standard deviation; interval mean; interval average; confidence a confidence interval constructed with a confidence level of 95% means that _______ of possible mean values will not be included in the estimated interval. top 2.5% and bottom 2.5% only top 5% only bottom 5% top 5% and bottom 5% 95% when constructing a confidence interval, if the population standard deviation is known, one would use ______. a z value a t value an f value a chi-square value a 95% confidence level when constructing a confidence interval, if the population standard deviation is not known, one would use ____. a z value a t value an f value a chi-square value a 5% significance level the ____ a confidence level and a significance level should be ________. sum of zero difference between zero sum of zero difference between zero product of one approximately 66% of observations in a normal distribution fall within an interval between ______ above and below the mean. one(1) standard deviation two(2) standard deviations three(3) standard deviations one(1) inter-quartile two(2) inter-quartiles As a new human resources(HR) director, you found from a random sample of 16 people who left your firm that they had an average stay of 5 years at your firm with a population standard deviation of 2 years. if you are to construct a 95% confidence interval for an average job length for your employees, it is best for you to use ____ and ____ years. a z value; a standard deviation of 2 a t value; a standard deviation of 2 a z value; a standard error of 0.125 a t value; a standard error of 0.125 a z value; a standard error of 0.5 As a new human resources(HR) director, you found from a random sample of 25 people who left your firm that they had an average stay of 5 years at your firm with a sample standard deviation of 3.3 years. if you are to construct a 95% confidence interval for an average job length for your employees, it is best for you to use ____ and ____ years. a z value; a standard deviation of 3.3 a t value; a standard deviation of 3.3 a z value; a standard error of 0.66 a t value; a standard error of 0.66 a z value; a standard error of 0.132

Explanation / Answer

2. In order to compute the confidence interval for true population mean, the sample mean is computed inorder to estimate the population mean. Therefore, sample mean, xbar is used as point estimate of population mean, mu.

Ans>b

3. The 95% confidence interval means that on repeated calculations of confidence interval for samples drawn from same population, the interval will capture the true population mean in 95% of the cases. A confidence for 1-alpha is the inverse of significance level alpha.

Ans>e

4. For known population standard deviation, z critical value is used, fr computing confidence interval.

Ans>a

5. For unknown population standard deviation, a t critical value is used to compute the confidence interval.

Ans>b

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.