Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the criticalvalue ta/2, (b) find the critical value za/2, or (c) state that neither the normal distribution nor the t distributionapplies.30어20어The confidence level is 99%, o is not known, and the histogram of 66 player salaries (in thousands of dollars) offootball players on a team is as shown.10-4000 8000 12000 16000 20000Salary (thousands of dollars)Frequency

Solution: n= 66 Sample size of football player. C=99%= 0.99 confidence level α=1-C=0.01 Level of…

Answered: Assume that we want to construct 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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A particular fruit's weights are normally distributed, with a mean of 492 grams and a standard deviation of 14 grams. If you pick one fruit at random, what is the probability that it will weigh between 479 grams and 511 grams
QUESTION 3 A wholesaler must decide how many computers to purchase before they know how many they will be able to sell to local retailers. The wholesaler purchases the computers for S300 each and sells them to retailers for $350 each. If the wholesaler is not able to sell them to a retailer then the wholesaler can return them to the manufacturer (for a refund of the S300 cost), but the wholesaler must pay $40 per computer that it returns to the manufacturer (in shipping, handling, and insurance costs). The following probability distribution describes the number of computers the wholesaler may possibly sell to local retailers: there is a 21% chance that they will sell 900 computers, a 56% chance that they will sell 1200 computers; otherwise, they will sell 1500 computers. What is the expected number of computers the wholesaler will sell? (please round your answer to 1 decimal place)
Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made during the week. A sample of 85 weekly reports showed a sample mean of 17.5 customer contacts per week. The sample standard deviation was 5.4 . Provide 90 % and 95 % confidence intervals for the population mean number of weekly customer contacts for the sales personnel. 90% confidence interval, to 2 decimals: ( , ) 95% confidence interval, to 2 decimals: ( , )
Ch6. "A carpet manufacturing company is comparing the tensile strengths of two different types of synthetic fiber. Synthetic fiber A used in manufacturing carpet has tensile strength that is normally distributed with mean 75 psi and standard deviation 12 psi, and synthetic fiber B has tensile strength that is 70 psi and standard deviation 12 psi. Random sample of nA = 16 and nB = 9 of fiber specimens are selected. Find the probability that the sample mean of fiber specimen A exceeds the sample mean of fiber specimen B by 4."
A chemical engineer for a tire manufacturer is investigating tire life for a new rubber compound and has built 15 tires and tested them to end-of-life in a road test. The sample mean and standard deviation are i = 60,139.7 ands = 3645.94 kilometers. Find a 99% confidence interval on the mean tire life. Which t-distribution curve applies on the 99% confidence interval? Include your solution. O a. 57,336 sH S 62,914 O d. 57,337 Su S 62,942 t-2.947 O b. NONE O. 57,337 sH S 62,94
An SRS of 350 high school seniors gained an average of ?⎯⎯⎯=45points in their second attempt at the SAT Mathematics exam. Assume that the change in score has a Normal distribution with standard deviation ?=26.deviation Find a 90% confidence interval for ?� based on this sample. Give your answers to three decimal places. What is the lower bound? What is the upper bound ?
Milan n.n
A sample of 100 students was taken from the introductory statistics classes. This group averaged 74.5 on the final exam with a sample standard deviation of 3.2. Assuming that this group is a random sample of all students who have taken statistics and the scores in the final exam for all students are approximately normally distributed, what is the approximately 95% confidence interval for the true population mean of all statistics students?
Suppose a new standardized test is given to 97 randomly selected third-grade students in New Jersey. The sample average score Y on the test is 62 points, and the sample standard deviation, sy, is 10 points. The authors plan to administer the test to all third-grade students in New Jersey. The 95% confidence interval for the mean score of all New Jersey third graders is (60.01, 63.99). (Round your responses to two decimal places.) Suppose the same test is given to 194 randomly selected third graders from lowa, producing a sample average of 66 points and sample standard deviation of 13 points. The 90% confidence interval for the difference in mean scores between lowa and New Jersey is (-6.26 -1.74). (Round your responses to two decimal places.) The p-value of the test of no difference in means versus some difference is (Round your response to four decimal places.)

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