9. The number of minutes that it takes for students to commute to class during the week follows anormal distribution with mean 20 and standard deviation 4. I go around the nation taking samples of100 people at a time and asking how long they take to get to class. For each group of 100 people, Itake the mean of the times I recorded. I do this until I feel confident that I can estimate the samplingdistribution of the mean amount of time it takes for people to get to class. Which graph below is thebest representation of what we would expect the sampling distribution of the sample mean to looklike?OO888.88a2g518.51019.01519.5Normal Density20yNormal Density20.0Y2520.53021.03521.5O2888.-1502-SO-100-50Normal Density050Normal Density100150

The given data is as follows:Population mean, Population standard deviation, Sample size,

Answered: 9. The number of minutes that it takes…

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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Any quantity that is computed from a sample is called
A research scientist wishes to test the claim that the mean number of children per classroom in California elementary school is less than 35. She selects a simple random sample of 29 California elementary school classrooms. She know nothing about the distribution of children in classrooms. Can she use the data to test her claim?
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Suppose that the average number of sick days that a person at the company takes per year is 3.2 with a standard deviation of .75. You select a sample of 125 employees. a. Is the sampling distribution for the mean of the sick days for 125 employees normally distributed? Explain how you know in complete sentences and be specific. b. What is the mean and standard deviation for the sampling distribution for the mean of 125 employees sick days? Show your work and calculations. c. Suppose that a group of 125 employees has a mean of 3.7 days. What is the probability that a group of 125 employees would take more sick days than them? You should use technology to find this value and write the probability notation. d. Suppose that a group of 35 employees has a mean of 3.5 days. Would that group have taken an unusual number of sick days?
To determine if their 1.50 inch steel handles are properly adjusted, Smith & Johnson Industries has decided to use an X-Chart which uses the range to estimate the variability in the sample. Step 1 of 7: What is the Center Line of the control chart? Round your answer to three decimal places. Table Period 1 2 Control Chart AnswerHow Select the Copy Table button to copy all values. To select an entire row or column, either click on the row or column header or use the Shi and arrow keys. To find the average of the selected cells, select the Average Values button. Copy Table 456789 Sample Mean Sample Range obs1 obs2 obs3 obs4 obs5 obs6 1.46 1.50 1.46 1.53 1.55 1.54 1.5067 1.54 1.45 1.49 1.4983 1.53 1.46 1.52 1.45 1.47 3 1.50 1.54 1.47 1.51 1.4900 1.53 1.47 1.50 1.53 1.5067 1.46 1.45 1.49 1.4850 1.51 1.5117 1.49 1.52 1.54 1.50 1.46 1.54 1.53 1.46 1.51 1.52 1.49 1.46 1.50 1.47 1.47 1.53 1.53 1.50 1.47 1.52 1.45 1.51 1.52 1.54 1.54 1.50 1.5050 1.5067 1.55 1.49 1.54 1.5083 1.51 1.54 1.5050 1.49…
F budy A consumer advocacy group is doing a large study on car rental practices. Among other things, the consumer group would like to do a statistical test regarding the mean monthly mileage, μ, of cars rented in the U.S. this year. The consumer group has good reason to believe that the mean monthly mileage of cars rented in the U.S. this year is greater than last year's mean, which was 2700 miles. The group plans to do a statistical test regarding the value of u. It chooses a random sample of monthly mileages and computes the mean of the sample to be 2800 miles and the standard deviation to be 750 miles. Based on this information, complete the parts below. (a) What are the null hypothesis Ho and the alternative hypothesis H₁ that should be used for the test? H₂ : Η H₁ :0 (b) Suppose that the group decides to reject the null hypothesis. What sort of error might it be making? (Choose one) ▼ (c) Suppose the true mean monthly mileage of cars rented in the U.S. this year is 2700. Fill in…
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According to the US Census Bureau. the number of people in a household has amean of 2.6 and a standard deviation of 1.5. Suppose the census bureauinstead had estimated this mean using a random sample of 225 homes and that sample had a mean of 2.4 and standar deviation of 1.4. Describe the center and spreadof the sample mean for 225 homes. What does the distribution describe?

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