The head librarian has asked her assistant for an interval estimate of the mean
ID: 3206313 • Letter: T
Question
The head librarian has asked her assistant for an interval estimate of the mean number of books check out each day. The assistant provides the following interval estimate: from 740 to 920 books per day. What is an unbiased point estimate of the number of books checked out exacta day? Suppose a 95% confidence interval for the population mean has be constructed. If it is decided to take a larger sample and to increase the confidence level of the interval. then the resulting interval width would Be larger than the current interval width Be narrower than the current interval width Be the same as the current interval width Be unknown until actual sample size and reliability levels are determined. A 95% confidence interval estimate can be interpreted to mean that: If all possible samples of size n are taken and confidence interval estimate are developed. 95% of them would include the true population mean somewhere in their interval We have 95% confidence that we have selected a sample whose interval does include the population mean Both of the above None of the above If you construct a 99% confidence interval of the population mean based on a sample of n = 25. where the standard deviation of the sample S = 0, 05 the critical value of t will be 2.797 2.787 2.492 2.485 A university dean is interested in determining the proportion of students who receive some sort of financial aid. He selects 200 students and finds that 118 of them are receiving financial aid. Use a 90% confidence interval to estimate the true proportion of students who receive financial aid.Explanation / Answer
1.The correct option is B
Explanation:
740+920/2 =830
2.The correct option is B
Be narrower than the current interval width
3. The correct option is C
c.Both the above
4. The correct option is A
a. 2.797
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.