3. (*) Leah's Toys produces molded plastic baby rattles. Theserattles must be completely smooth. That is, there can beno rough edges where the molded halves fit together.Rattles are judged to be either acceptable or defective withregard to this requirement. Leah's has determined that thecurrent process has an underlying p value of 0.01, mean-ing that, on average, 1 out of 100 rattles is currently judgedto be defective. Calculate the standard deviation for theprocess and the resulting control limits for samples of 200rattles each.

Given 1 out of 100 rattles is currently judged to be defective on an average.

Answered: 3. (*) Leah's Toys produces molded…

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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6. A psychology professor of a large class became curious as to whether the students who turned in tests first scored differently from the overall mean on the test. The overall mean score on the test was 75 with a standard deviation of 10; the scores were approximately normally distributed. The mean score for the first 20 students to turn in tests was 78. Using the .05 significance level, was the average test score earned by the first 20 students to turn in their tests significantly different from the overall mean?
3. At a land farm, a farmer desired to test the effect of a given fertilizer on soybean production. He chose 24 plots of land of which are equal surface area. He treated 12 plots with the fertilizer and the others were untreated. Otherwise the conditions were the same. The treated plots produced soybean with mean yield 5.1 bushels and a standard deviation of 0.36 bushels, while the untreated plots had mean yield 4.8 bushels and a standard deviation of 0.40 bushels. (a) Can we conclude that there is a significant improvement in soybean production because of the fertilizer if a significance level of 1% is used? (b) What is the P-value of the test?
You are the manager of a restaurant that delivers pizza to college dormitory rooms. You have just changed your delivery process in an effort to reduce the mean time between the order and completion of delivery from the current 25 minutes. A sample of 36 orders using the new delivery process yields a sample mean of 22.4 minutes and a sample standard deviation of 6 minutes. Perform a hypothesis test to determine if there’s evidence that the population mean delivery time has been reduced below the previous population mean value of 25 minutes by answering the following questions: (a) What are the null and alternate hypotheses for this test? (b) What is the value of the test statistic for this test? (c) Using the critical value approach, at the 0.05 level of significance, what is the decision rule? (d) What is your conclusion in context of the problem? (Answer this question in a complete sentence(s) and include why, referring to the decision rule.) (e) Using the p-value approach, at the…
The Wind Mountain archaeological site is located in southwestern New Mexico. Wind Mountain was home to an ancient culture of prehistoric Native Americans called Anasazi. A random sample of excavations at Wind Mountain gave the following depths (in centimeters) from present-day surface grade to the location of significant archaeological artifacts†. 85 45 120 80 75 55 65 60 65 95 90 70 75 65 68 (a) Use a calculator with mean and sample standard deviation keys to find the sample mean x and sample standard deviation s. (Round your answers to four decimal places.) x = cm s = cm (b) Compute a 98% confidence interval for the mean depth ? at which archaeological artifacts from the Wind Mountain excavation site can be found. (Round your answers to one decimal place.) lower limit cm upper limit cm
1. According to the records of an auto insurance company, the average distance that their customers drive to work is 17.4 miles. You are a new agent, and you think this is too low. You do a random polling of 50 of the company's customers, and you find that the average is 18.5 miles with a standard deviation of 3.4 miles. Do these data provide enough evidence at the 0.05 level of significance to conclude that the average distance driven to work is actually more than 17.4 miles? A. State the null and alternative hypotheses B. State the p-value. C. What is your conclusion about the null hypothesis? D. What is your conclusion in context of this problem?
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1) A half-century ago, the mean height of women in a particular country in their 20s was 63.7 inches. Assume that the heights of today's women in their 20s are approximately normally distributed with a standard deviation of 2.31 inches. If the mean height today is the same as that of a half-century ago, what percentage of all samples of 26 of today's women in their 20s have mean heights of at least 65.04 inches?
You are a researcher assessing self-checkout lane violations at supermarkets in a town in the southern United States. The supermarket has five (5) self-checkout lanes. The violations by each lane are as follows: Lane A: 5 violations Lane B: 10 violations Lane C: 15 violations Lane D: 20 violations Lane E: 25 violations Please calculate the following (your standard deviation is 7.91): Mean: Standard Error of the Mean: Please interpret your Standard Error of the Mean.
We have the number of recorded children from 20 randomly selected barangays in the Philippines to help us estimate the number of Filipino children aged 12- 23 months who did not receive any vaccinations appropriate for their age. 16, 22, 26, 31, 45, 18, 24, 26, 34, 46, 19, 24, 27, 35, 55, 19, 25, 28, 37, 58 A. Can we compute for the population standard deviation? B. If yes, what is the population standard deviation? Use the computational formula. If no, why not? C. Can we compute for the sample standard deviation? D. If yes, what is the sample standard deviation? Use the computational formula. If no, why not?
A financial analyst wants to ascertain whether there is a disparity in the mean rate of return for 6 types of transactions. The analyst selected a sample of 198 and conducted an ANOVA test that is shown as follows Variation SS MS Betwsan (Tratment) 156 2. Within (Enar Total 574 The Frado s wusl o? Round answer to th decimal places ex.2.051)

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