Devan XO Mail xG Gran XHorn XGrad xzy Secti xMUh-c Xb Ansv XCom, XACTs.com/zybook/QNT_375T 55007971/chapter/5/section/5> QNT/375T: Business Data Analytics home >thesis test for a population meanE zyBooks catalog9846.1423376.gx3zayJump to level 1A auto maker is interested in information about how long transmissions last. A sample of transmissions are runconstantly and the number of miles before the transmission fails is recorded. The auto maker claims that thetransmissions can run constantly for over 150,000 miles before failure. The results of the sample are given below.Miles (1000s of miles)Mean151.2Variance17.22Observations44Hypothesized Mean150df43t StatP(T<=t) one-tail1.889p= Ex: 1.2340.033t Critical one-tail1.681-2-1P(T<=t) two-tallt Critical two-tail0.066t = Ex: 1.2342.017Confidence Level(95.0%) 1.129What condition is met for the use of a t-distribution? Pickn = Ex: 5元=Ex12Degrees of freedom = Ex: 5s = Ex: 1.234F11pausebreakprtsyF7F8F9F10F12F4F5F6&8.

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Answered: 16. 1423376.qxszay Jump to level 1 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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QUESTION 2 A minimum mileage guarantee on the tires of a tire manufacturing company is being considered to be set. When the company conducted many tire tests, it revealed that the mean mileage has a normal distribution with mean 2,752 and standard deviation 119. The tire manufacturer wants to set the minimum guaranteed mileage so that no more than 2.5 percent of tires will have to be exchanged. Calculate the Lower limit of guaranteed mileage? (Round answer to two decimal places ex. 2.09)
2. A pet association claims that the mean annual costs of food for dogs and cats are the same. The results for samples of the two types of pets are shown in the following table. On wished to test the claim. Assume both populations follow normal distributions Dogs Cats 21 - 16 T1= 239 n2 = 18 Iz= 203 S1 = 32 82 =28 with equal variances. Which of the following formula should be used to calculate the standardized test statistic? (a) Z = (21-32)- Do lu A n2 = (E1-2)-Do (b) Z V n1+2 (c) T (1-2)-Do (21-1)a7+(n2-1)s I1 11+11タ-3 V 1'n2 (d) T = d- Do sp/Vn (e) Z
4. QUESTION A precision instrument is guaranteed to be accurate within 2 units. A sample of four instrument readings on the same object yielded the measurements 353 351 351 355. 4.1 Construct a 95% confidence interval for the variance of the instrument's precision readings 4.2 It is believed that the variation in the instrument's precision readings is equal to 0.5. From your confidence interval, is there sufficient evidence to conclude that the variance differs from 0.5? Explain your answer
3.18. A manufacturer of television sets is interested in the effect on tube conductivity of four different types of coating for color picture tubes. A completely randomized experiment is conducted and the following conductivity data are obtained: Coating Type 1 234 2 4 143 152 134 129 Conductivity 150 137 132 132 141 149 136 127 146 143 127 129 (a) Is there a difference in conductivity due to coating type? Use a = 0.05. (b) Estimate the overall mean and the treatment effects. (c) Compute a 95 percent confidence interval estimate of the mean of coating type 4. Compute a 99 percent confidence interval estimate of the mean difference between coating types 1 and 4.
5.2° A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service for the fleet of cars is bell-shaped and has a mean of 51 months and a standard deviation of 9 months. Using the empirical rule (as presented in the book), what is the approximate percentage of cars that remain in service between 24 and 42 months? Do not enter the percent symbol. ans = Question Help: Video Submit Question 0 % a $ || hp
5. We don't want predictor variables that are too highly correlated with each other or they are redundant (say ≥±.70) or multicollinear (2±.90), which means the variables are measuring pretty much the same thing so why have them all in the equation. What was the finding for redundancy between SPI Scientist and SPI Practitioner? a. No issue with redundancy since the shared variance between the two variables was only 4% (r2 = .04). b. There was an issue with redundancy between the two variables shared 62% of the variance in the relationship.
3.8 14.44 Talal 62 43,32 -23.2 25K 08 The mean for thus data is 23,2 -4,963076923 52 The standard deviation is (variance) 4.963076923-2.2 EXAMPLE 4 (by using a calcalator) The standard deviation can be easily caleulated by using a calculator. Refer to your calculator's manmul for the details on how to do this or discuss this with your eacher EXERCISE 3 Classwork 06/09/2021 The number of points scored by four cyclists over a namber of races are gren below 6. 8. 2. 6. 8. 10 10 10 10 10 8. 10 CI D 2 4. 6. 6. 8. 8. 10 4. 8. 10 10 10 Calculate the mean and standard deviation for cach cyclist without ting a calculator Now calcuiate the standard deviation for cach cyclist by using your calculator Dascuss the performance of each cyclist by referning to the standard deviation for each cyclist (a) The following table contains the number of learners who obtained certain marks on a Biology class test our of 30. 27 28 29 24 7. 25 10 26 13 20 21 22 23 Marks No of learners 2. 3. Calculate the tandard…
9. You are an agricultural consultant researching the effect of different ground surfaces for dairy cattle. On a particular farm, the cow stalls are covered with straw, and the farm produces an average of 750 gallons of milk per day. The farmer is interested in knowing whether he can increase his milk yield by swapping out the straw for cow waterbeds. After making the switch, the farmer measures his yield on 18 days, finding a sample mean of 810 gallons and a sample standard deviation of 80 gallons. a) Carry out a hypothesis test to ask whether the mean yield from cows on waterbeds is greater than the mean yield for cows on straw, using a = 0.01. Be sure to carry out all of the steps of a hypothesis test, and phrase your conclusion in a way that will be useful to the farmer.
Question [2] A manager at a power company monitored the employee time required to process high efficiency lamp bulb rebates. A random sample of 49 applications gave a sample mean time of 4.0 minutes and a standard deviation of 1.0 minute. Construct a point estimate for the population mean time u to process mean u, and give its 80% error margin.
3/10 Question 5 of 10, Step 1 of 1 Correct A manufacturer of banana chips would like to know whether its bag filling machine works correctly at the 413.0 gram setting. It is believed that the machine is underfilling the bags. A 41 bag sample had a mean of 412.0 grams. A level of significance of 0.05 will be used. Determine the decision rule. Assume the variance is known to be 625.00. Enter the decision rule, Answer E Tables E Keypad How to enter your answer Keyboard Shortcuts Reject Ho if z <
QUESTION 15 A minimum mileage guarantee on the tires of a tire manufacturing company is being considered to be set. When the cormpany conducted many tire tests, it revealed that the mean miksage has a normal distribution with mean 4,743 and standard deviation 60 The tire manufacturer wants to set the minimum guaranteed mileage so that no more than 2.5 percent of tires will have to be exchanged. Calculate the Lower limit of guaranteed mikeage? (Round answer to lwo decimal places ex. 2.09)
16.

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