e. What conditions are required for the test results to be valid? Select all that apply.A. The sample was selected from a population with a distribution that is highly skewed.B. The population standard deviation is known.C. The sample was random.D. The sample was selected from a population with a distribution that is approximately normal.E. No assumptions are required for this test. In a study published in a journal, occupational accidents at three construction sites in a country were monitored.The total numbers of accidents at the three randomly selected sites were 52, 105, and 38. Summary statistics forthese three sites are: x = 65 and s= 35.3. Suppose an occupational safety inspector claims that the averagenumber of occupational accidents at all of the country's construction sites is less than 71.

Sample mean, x¯=65 Sample sd, s=35.3

Answered: e. What conditions are required for the…

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) Which of these variables is least likely to have a Normal distribution? A. Income per person for 150 different countries. B. Heights of 100 white pine trees in a forest. C. Lengths of 50 newly hatched pythons. D. None of the above.(B) To completely specify the shape of a Normal distribution, you must give A. the median and the standard deviation. B. the five-number summary. C. the mean and the standard deviation. D. the mean and the median. E. All of the above (c) The scores of adults on an IQ test is approximately Normal with mean 100 and standard deviation 15. Corinne scores 118 on such test. Her z-score is about A. 1.2 B. 0.67 C. 18 D. 7.87 E. None of the above.
Determine the sample standard deviation,s, for the following set of sample data. Hint: =23 x (x- ) (x- )2 19 20 23 30
Consider two populations in the same state. Both populations are the same size (22,000). Population 1 consists of all students at the State university. Population 2 consists of all residents in a small town. Consider the variable Age. Which population would most likely have the largest standard deviation? They would likely have the same standard deviation(SD) for age because they have the same population size. O Population 2 would more likely have a higher standard deviation (SD) than Population 1. Population 1 would more likely have a higher standard deviation(SD) than Population 2 There is not enough information to tell.
The University of Montana admission standards require students to have an ACT score of at least 22. We know that Montana ACT scores are normally distributed with a mean of 20.1 and a standard deviation of 4. A: Students in Oregon have a mean ACT score of 21.1 with a standard deviation of 2.8. If we chose one student each at random from Oregon and from Montana, which student would be more likely to meet the ACT requirements of the University of Montana? Explain your answer using the appropriate statistics and a correctly labeled and shaded normal distribution. B: We know that the Montana ACT scores are normally distributed with a mean of 20.1 and a standard deviation of 4. Assume that the top 2% of individuals in the state are eligible for a state-funded scholarship. What score does an individual need on the ACT to be eligible? Explain your answer using the appropriate statistics and a correctly labeled and shaded normal distribution
A primary measure of dispersion for sample data is the sample standard deviation, s. Choose the best option to explain what the meaning of the sample standard deviation is, in general. A. The distance between one observation and the mean. B. The average distance of an observation from the middle of the distribution. C. The average distance between observations in the sample. D. The distance between the third and first quartiles.
A certain species of tree has an average height of 22 ft with a standard deviation of 3 ft. Which of the following is more likely to exceed 24 ft? A. The average height of a sample of 33 trees B. Not enough information given to compare the choices C. The height of a single tree D. The average height of a sample of 12 trees
A brand of corn flakes come in a box that says it holds 28 ounces of cereal. The manufacturer says that the weights of corn flakes have a normal distribution with a standard deviation of 0.13 ounces. Use the Cumulative Z-Score Table to answer the following questions. The Z-Score Table can be found below by selecting "Read". Round all answers to the nearest box. If the manufacturer ships 730,000 boxes thèn... boxes ...how many boxes weigh less than 27.9025 ounces? boxes ...how many boxes weigh more than 27.9025 ounces? boxes ...how many boxes weigh less than 27.636 ounces? boxes ..how many boxes weight more than 27.636 ounces? boxes ...how many boxes weigh between 27.636 and 27.9025 ounces? Z-Score Table. Question Help: Video Submit Question 9:40 AM
five samples of 15 minerals are taken from a population. The sample means for hardness of the minerals are 6.5, seven, seven, 6.5, and six. The standard deviation for the mineral is .745. Find the meaning of the sample means and the standard deviation of the sample means for the hardness
4. The lowest and the highest data value of a data set are 12 and 28 respectively, then the approximate standard deviation is:
Consider the data set 1, 2, 3, 4, 5, 6, 7, 8, 9. a. Use the defining formula to obtain the sample standard deviation.b. Replace the 9 in the data set by 99, and again use the dening formula to compute the sample standard deviation.c. Compare your answers in parts (a) and (b). The lack of what property of the standard deviation accounts for its extreme sensitivity to the change of 9 to 99?
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The systolic blood pressure of adults in the USA is nearly normally distributed with a mean of 121 and standard deviation of 16 .Someone qualifies as having Stage 2 high blood pressure if their systolic blood pressure is 160 or higher.c. Stage 1 high BP is specified as systolic BP between 140 and 160. What percentage of adults in the US qualify for stage 1?____%d. Your doctor tells you you are in the 30th percentile for blood pressure among US adults. What is your systolic BP? Round to 2 decimal places.____lbs

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