A custodian wishes to compare two competing floor waxes to decide which one is best. He believes that themean of WaxWin is less than the mean of WaxCo.In a random sample of 60 floors of WaxWin and 33 of WaxCo. WaxWin had a mean lifetime of 20.5 andWaxCo had a mean lifetime of 20.6.The population standard deviation for WaxWin is assumed to be 10.3 and the population standard deviationfor WaxCo is assumed to be 8.4.Perform a hypothesis test using a significance level of 0.10 to help him decide.Let WaxWin be sample 1 and WaxCo be sample 2.The correct hypotheses are:Ο Ηο: μι < μεHA: M1 M₂(claim)Ο Ηο: με 2 μεHA1₂(claim)O Ho: ₁ = 2HA: M12(claim)Since the level of significance is 0.10 the critical value is -1.282(round to 3 places)The test statistic is:The p-value is:(round to 3 places)

Answered: A custodian wishes to compare two…

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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Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 2500 grams and a standard deviation of 600 grams while babies born after a gestation period of 40 weeks have a mean weight of 3100 grams and a standard deviation of 510 grams. If a 35-week gestation period baby weighs 2900 grams and a 41-week gestation period baby weighs 3500 grams, find the corresponding z-scores. Which baby weighs more relative to the gestation period? ..... Find the corresponding z-scores. Which baby weighs relatively more? Select the correct choice below and fill in the answer boxes to complete your choice. (Round to two decimal places as needed.) O A. The baby born in week 41 weighs relatively more since its Z-score, is smaller than the z-score of for the baby born in week 35. B. The baby born in week 35 weighs relatively more since its z-score, is smaller than the z-score of for the baby born in week 41. O C. The baby born in week 35 weighs relatively more since its z-score, is…
Suppose a shopkeeper is making bags of 2 pounds of flour with a large quantity of flour bought in bulk. The shopkeeper keeps adding flour to a bag till the weighing scale reads 2 pounds and seals the bag. The weighing scale the shopkeeper uses has an error. Hence when the scale reads 2 pounds, the true weight is distributed normally with a mean of 2 pounds and a standard deviation of 0.08 pounds. What proportion of the bags have less than 1.9 pounds of flour? Answer correct to 3 decimal places. (Standard Normal Table)
The difference in the Organic Chemistry final exam scores between last semester and three years ago will be analyzed by the dean. Although the standard deviations of these populations are unknown, the dean has evidence that they are equal. A sample of 41 of these scores from last semester had a mean of 63.7 and standard deviation of 4.6, and a sample of 37 scores from three years ago had a mean of 64.7 and standard deviation of 5. A claim is made that the mean final exam score from last semester ( 1) is less than the mean final exam score from three years ago (2). For each part below, enter only a numeric value in the answer box. For example, do not type "z =" or "t=" before your answers. Round each of your answers to 3 places after the decimal point. 1 (a) Calculate the value of the test statistic used in this test. Test statistic's value= (b) Use your calculator to find the P-value of this test. P-value = 0.180 F3 Submit Question 4 R F4 H % 5 T Q F5 A 6 Y F6 & 7 U F7 * PrtScn 8 F8…
12) If the standard deviation of a data set is (17.2); the variance will be (295.84). Select one: True False
Birth weights in the US are normally distributed with a mean of 3420 g and a Standard deviation of 495 g. If a hopsital plans to set up special observation conditions for the lightest 3% of babies, what weight is used for the cut-off separating the lightest 3% from others?
Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 3000 grams and a standard deviation of 700 grams while babies born after a gestation period of 40 weeks have a mean weight of 3400 grams and a standard deviation of 560 grams. If a 35-week gestation period baby weighs 2600 grams and a 41-week gestation period baby weighs 3000 grams, find the corresponding z-scores. Which baby weighs less relative to the gestation period? Find the corresponding z-scores. Which baby weighs relatively less? Select the correct choice below and fill in the answer boxes to complete your choice. (Round to two decimal places as needed.) O A. The baby born in week 41 weighs relatively less since its z-score, is larger than the z-score of for the baby born in week 35. O B. The baby born in week 41 weighs relatively less since its z-score, , is smaller than the z-score of for the baby born in week 35. O C. The baby born in week 35 weighs relatively less since its z-score, , is…
An advertising agency is interested in learning how to fit its commercials to the interests and needs of the viewing audience. It asked samples of 41 men and 41 women to report the average amount of television watched daily. The men reported a mean television time of 1.70 hours per day with a standard deviation of .70. The women reported a mean of 2.05 hours per day with a standard deviation of .80. Use these data to test the manager's claim that there is a significant gender difference in television viewing at 0.05 level. Let Xm be the group of men and Xw be the group of women. What is the critical value of the study? Show solution a. ±1.66b. ±1.99c. ±2.64d. ±2.37
The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million and a standard deviation of $2 million. The salaries of professional football players are also heavily skewed right with a mean of $1.9 million and a standard deviation of $1.5 million. A random sample of 40 baseball players’ salaries and 35 football players’ salaries is selected. The mean salary is determined for both samples. Let represent the difference in the mean salaries for baseball and football players. Which of the following represents the standard deviation of the sampling distribution for ? A) 0.41 million B) 0.57 million C) 2.5 million D) 3.5 million
A cohort of patients have lost on average 23 pounds and the standard deviation of the sample is 1.2 ounces. You subsequently discover that the scale used to measure all patients overestimates the weight by 3 pounds. What is the true mean of the sample weights (in pounds)? And if, A cohort of patients have lost on average 23 pounds and the standard deviation of the sample is 1.2 ounces. You subsequently discover that the scale used to measure all patients underestimate the weight by 3 pounds. What is the true standard deviation (in ounces) of the sample weights?
Give two situations in which comparing two population standard deviations would be important
A certain type of battery supercharger was found to take a mean of 12.3 minutes to charge a standard electric vehicle (EV) battery. A firmware update for this type of supercharger was recently released, but the update has received negative reviews from users. A researcher suspects the mean time the updated superchargers take to charge a standard EV battery is greater than 12.3 minutes. To test his claim, he chooses 21 of the updated superchargers at random and measures the time it takes each one to charge a standard EV battery. He finds that the superchargers take a sample mean of 12.9 minutes to charge a standard EV battery, with a sample standard deviation of 1.3 minutes. Assume that the population of amounts of time to charge a standard EV battery using the updated superchargers is approximately normally distributed. Complete the parts below to perform a hypothesis test to see if there is enough evidence, at the 0.05 level of significance, to support the claim that u, the mean time…
The blue, red, and yellow curves all have a mean of 0, while the green curve has a mean of -2. The blue curve has a standard deviation of 0.2, the red curve 1.0, the yellow curve has a standard deviation of 5.0, and the green curve has a has a standard deviation standard deviation of 0.5. Suppose a dataset is normally distributed (i.e. its frequency distribution looks like a normal curve). Would you expect the mean, median, and mode of the dataset to be significantly different? If not, which is the least, and which is the greatest? Explain your answer and use the curves in the graph above to give concrete examples to support your answer. < O O

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