Consider a normal population distribution with the value of a known.(a) What is the confidence level for the interval x + 2.880/ √n? (Round your answer to one decimal place.)%USE SALT(b) What is the confidence level for the interval x ± 1.470/ √n? (Round your answer to one decimal place.)%za/2(c) What value of Za/2 in the CI formula below results in a confidence level of 99.7%? (Round your answer to two decimalplaces.)(x-²α/2"(d) Answer the question posed in part (c) for a confidence level of 70%. (Round your answer to two decimal places.)za/2You may need to use the appropriate table in the Appendix of Tables to answer this question.Need Help? Read ItWatch ItMaster It

It is required to identify the confidence levels for given critical values, and the critical values…

Answered: Consider a normal population…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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A statistics class is estimating the mean height of all female students at their college. They collect a random sample of 42 female students and measure their heights. The mean of the sample is 65.3 inches and the sample standard deviation is 5.4 inches. Find the 90% confidence interval for the mean height of all female students in their school? Assume that the distribution of individual female heights at this school is approximately normal. 1. The t value is 1.3025 2. The standard error has a value of -- 3. The margin of error has a value of 4. Find the 90% confidence interval for the mean height of all female students in their school
Construct the indicated confidence interval for the population mean u using the t-distribution. Assume the population is normally distributed. c= 0.90, x= 13.6, s=3.0, n= 10 (Round to one decimal place as needed.)
es A sample of 12 fossil skeletons of an extinct species of bird has been collected. The mean length of the skulls in this sample is 5.29 cm and the standard deviation of the sample is 0.21 cm. Assuming that such measurements are normally distributed, find a 90% confidence interval for the population mean length of the skulls of this species of bird. You may want to use one of these: qt (p-0.10, df-11, lower. tail-FALSE)=1.36343 qt(p-0.05, df-11, lower.tail-FALSE) =1.795885 qnorm(0.10, mean-0, sd-1, lower.tail-FALSE)=1.281552 qnorm(0.05, mean-0, sd-1, lower.tail=FALSE)=1.644854 O (4.945, 5.635) O (4.913, 5.667) O (5.021, 5.559) O (5.181, 5.399)
Construct the indicated confidence interval for the population mean u using the t-distribution. Assume the population is normally distributed. C = 0.99, x= 12.3, s=0.75, n= 13 ..... (Round to one decimal place as needed.)
You measure 38 textbooks' weights, and find they have a mean weight of 64 ounces. Assume the population standard deviation is 14.3 ounces. Based on this, construct a 80% confidence interval for the true population mean textbook weight.Report your answers to three decimal places.Confidence Interval= ( , ) Hint: Did you see that you are given the population standard deviation? This means the z-distribution is appropriate here instead of the t-distribution.
Construct a confidence interval of the population proportion at the given level of confidence. x equalsx=540540, n equalsn=11001100, 9595% confidence Click here to view the standard normal distribution table (page 1). LOADING... Click here to view the standard normal distribution table (page 2). LOADING... The lower bound of the confidence interval is nothing . (Round to three decimal places as needed.) The upper bound of the confidence interval is nothing . (Round to three decimal places as needed.) Enter your answer in each of the answer boxes.
SAT scores are distributed with a mean of 1,500 and a standard deviation of 303. You are interested in estimating the average SAT score of first year students at your college. If you would like to limit the margin of error of your confidence interval to 40 points with 90 percent confidence, how many students should you sample? (Round up to a whole number of students.)
Researchers studied the mean egg length (in millimeters) for a bird population. After taking a random sample of eggs, they obtained a 95% confidence interval of (45,60). What is the value of the margin of error? Choose the correct answer below. A. 15 mm B. 52.5 mm O c. 7.5 mm O D. 1.96
Construct the indicated confidence interval for the population mean u using the t-distribution. Assume the population is normally distributed. c = 0.95, x = 14.8, s= 0.69, n= 13 (Round to one decimal place as needed.)
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