4.A 95% confidence inter val for a population mean µ, based on a sample of size 49, is (12.5,20.1).(a) The sample mean, , is(i) 3.8.(ii) 16.3.(iii) 7.6.(iv) 32.6.(v) 1.96.(b) The maximum error for this confidence interval, E, is(i) 3.8.(ii) 16.3.(iii) 7.6.(iv) 32.6.(v) 1.96.(c) Compared to the 95% confidence interval, (12.5, 20.1), a 90% confidence interval based on the samesample will be(i) wider.(ii) narrower.(iii) of the same width.

The 95% confidence interval is given by (12.5, 20.1). Let M be the sample mean and E be the margin…

Answered: A 95% confidence inter val for a…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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#1) Flying time on an old route between 2 cities has a mean value of µ =5.25 hours with standard deviation is o =0.6 hours. There are 36 flights on a new route where the mean is x = 4.90 hours. Does this indicate that the average flying time for the new route is less than 5.25 hours? Use a 5% level of significance.
mean of the process is the estimate developed in part (a). Twenty-five samples of 100 items each were inspected when a process was considered to be operating satisfactorily. In the 25 samples, a total of 135 items were found to be defective. What is an estimate of the proportion defective when the process is in control? b. a. What is the standard error of the proportion if samples of size 100 will be used for statistical process control? Compute the upper and lower control limits for the control chart. C.
A random sample of 82 eighth grade students' scores on a national mathematics assessment test has a mean score of 286. This test result prompts a state school administrator to declare that the mean score for the state's eighth graders on this exam is more than 280. Assume that the population standard deviation is 38. At α = 0.05, is there enough evidence to support the administrator's claim? Complete parts (a) through (e). (a) Write the claim mathematically and identify Ho and H₂. Choose the correct answer below. O A. Ho: ≤280 (claim) H₂:μ>280 O D. Ho: μ≤280 Ha: μ> 280 (claim) B. Ho: μ280 OF. Ho: μ = 280 H₂: µ>280 (claim)
Score: 90/260 • Question 11 Suppose your manager indicates that for a normally distributed data set you are analyzing, your company wants data points between z = -1.6 and z = 1.6 standard deviations of the mean (or within 1,6 standard deviations of the mean). What percent of the data points will fall in that range? Answer: percent (Enter a number between 0 and 100, not 0 and 1 and round to 2 decimal places)
# 12 of 12 3 Consider the probability distribution of X, where X is the number of job applications completed by a college senior through the Career Center before getting a job. X 0 1 P(X) 0.002 0.011 0.877 O 0.123 WWhat is the probability that a randomly selected college senior who uses the career center completed at most three job applications? O 0.872 F3 0.251 20 80 OCT 4 31 $ F4 4 2 0.115 12 3 0.123 tv♫ 4 5 6 7 0.144 0.189 0.238 0.178 F5 2 I JI ZA MacBook Air c F6 % 188888 5 6 & ♡ 7 F7 B DII F8 W X ( 9 F9 ) 0
A set of 11 data pairs (x.y) were collected and were found to have a linear relationship given by: y = 3.04 x + 0.99 The Standard Error of the Fit for this equation is 0.755 and the confidence interval, CI, is written as: y = ax + b+ (e) Provide the value of the margin of error, e, at a confidence level of 95%. (Use 3 decimal places to express your answer).
Weights of female cats of a certain breed are normally distributed with mean 4.1 kg and standard deviation 0.6 kg. (i). What proportion of female cats have weights between 3.7 and 4.4 kg? . (ii). A certain female cat has a weight that is 0.5 standard deviations above the mean. What proportion of female cats are heavier than this one?. (iii). How heavy is a female cat whose weight is on the 80th percentile?. (iv). A female cat is chosen at random. What is the probability that she weighs more than 4.5 kg? . (v). Five female cats are chosen at random. What is the probability that exactly one of them weighs more than 4.5 kg? .
Suppose that the distribution of scores on an exam can be described by a normal curve with mean 110. The 16th percentile of this distribution is 80. (Use the Empirical Rule.) (a) What is the 84th percentile? (b) What is the approximate value of the standard deviation of exam scores? (c) What z score is associated with an exam score of 125? (d) What percentile corresponds to an exam score of 170? (e) Do you think there were many scores below 20? Explain. A score of 20 is? standard deviations below the mean, and so the percentage of scores below 20 would be approximately ... how many percentage

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