a.b.In a normal distribution, a = -2, z = 6. This tellsyou(right or left) of the mean.O A. leftOB. right67Uthat x = -2 isstandard deviations to the

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Answered: a. In a normal distribution, 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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Which of the following are true when calculating z-scores for a distribution of numbers? Select all that apply. a. A z-score of 1 is 0.5 standard deviations from the mean b. A z-score of 1 is 1 standard deviation from the mean c. The mean of z-scores is equal to 0 d. The sum of z-scores is equal to 0 e. The mean of z-scores is equal to 1 f. The sum of z-scores is equal to 1
Find the area of the shaded region. The graph to the right depicts IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15. Click to view page 1 of the table. Click to view page 2 of the table. 70 115 The area of the shaded region is 0.8185. (Round to four decimal places as needed.) (1,1) More Enter your answer in the answer box.
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dy The historical reports from two major networks showed that the mean number of commercials aired during prime time was equal for both networks last year. In order to find out whether they still air the same number of commercials on average or not, random and independent samples of 100 recent prime time airings from both networks have been considered. The first network aired a mean of 109.5 commercials during prime time with a standard deviation of 5.2. The second network aired a mean of 110.5 commercials during prime time with a standard deviation of 5.3. Since the sample sizes are quite large, assume that the population standard deviations can be estimated to be equal to the sample standard deviations, 5.2 and 5.3. At the 0.10 level of significance, is there sufficient evidence to support the claim that the mean number, μ₁, of commercials aired during prime time by the first station is not equal to the mean number, μ₂, of commercials aired during prime time by the second station?…
f Suppose that you take an exam with 391 possible points and are told that that mean score is 270 and that the standard deviation is 22. You are also told that you got 346. Did you do well on the exam? Explain your answer. Determine the z-score and interpret this score. A score of 346 has a z-score of. This is standard deviations the mean for this exam. The this score is the mean, this is a score. (Round to two decimal places as needed.) standard deviations states that approximately 99.7% of the observations lie within standard deviations of the mean. Sine
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If your score on your next statistics test is converted to a z score, which of these z scores would you prefer: - 2.00, - 1.00, 0, 1.00, 2.00? Why? OA The z score of 1.00 is most preferable because it is 1.00 standard deviation above the mean and would correspond to an above average test score. O B. The z score of 0 is most preferable because it corresponds to a test score equal to the mean. OC. The z score of - 1.00 is most preferable because it is 1.00 standard deviation below the mean and would correspond to an above average test score. OD. The z score of 2.00 is most preferable because it is 2.00 standard deviations above the mean and would correspond to the highest of the five different possible test scores. O E. The z score of -2.00 is most preferable because it is 2.00 standard deviations below the mean and would correspond to the highest of the five different possible test scores. O Time MacBook PrO -> G Search or type URL esc ! @ #3 2$ % 2 4 6. 7 8 R Y P Q tab A S F G K caps…
Which of the following are true about the Z-score? Two answers correct. All or nothing credit. 1. It provides a sense of how far an observation is from the mean in terms of the magnitude of the standard deviation. 2. If an observation in a data set has a Z-score of 1.5, the observation is 1.5 standard deviation greater than the mean of the data set. 3. A Z-score of -1 tells us that the average value of the data set is one standard deviation below the mean. 4. The Z-score measures where the observations in a data set are scattered around.
4. Which proportion of a normal distribution is located between the mean and z = +1.40? 5. A vertical line drawn through a normal distribution at z = +2.11 separates the distribution into two sections, the body and the tail. Which proportion of the distribution is in the tail?
5. The You have a score of X = 75 on a statistics exam. The mean score for the class on the exam is µ = 70. Which of the following values for the standard deviation would give you the highest position within the class? a. o=5,b. o = 1, c. o = 10, d. o = 12 %3D
Calculate the standard deviation of the heart rates for the group of students by using the formula and table below to assist you. Refer to the mean x that you found in question #2. Round all values in the table (if applicable) and your final answer to three decimal places. 66 67 69 70 71 Mean: (66+67+70+71+69)/5 = 343/5 = 68.6 Median: middle # Mode: no # is repeated Midrange: (71+66)/2 =137/2 = 68.5

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a. In a normal distribution, a = - (right or left) of the mean. b. -2, z = 6. This tells you that x = -2 is O A. left O B. right standard deviations to the