6. What termused to identify the mean of the distribution of sample means?a. expected value of meanb. standard error of meanc. sample meand. central limit mean7. A sample of n=25 scores is selected from a population with u = 100 with o =average, how much error would be expected between the sample mean and the population20. Onmean?25 pointsb. 20 points4 pointsd. 0.8 pointsa.C.8. A random sample of n = 4 scores is selected from a population. Which of the followingdistributions definitely will be normal?The scores in the sample will form a normal distribution.b. The scores in the population will form a normal distribution.The distribution of sample means will form a normal distribution.d. Neither the sample, the population, nor the distribution of sample means will benormal.a.C.9. What happens to the expected value of the standard error of the mean as sample sizeincreases?It also increases.b. It also decreases.a.It stays constant.d. Need more information.C.10. If a sample of n=4 scores is obtained from a population with mean of 70 and a standarddeviation of 12, then what is the z-score corresponding to a sample mean of 76?a. z=0.25b. z=0.50C. z=1.00d. z=2.00

Answered: Image /qna-images/answer/fa6a70fe-6b28-4de7-bb52-3c553b6a5f56.jpg

Answered: 6. What term used to identify the mean…

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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1. According to a website the mean number of apps on a smartphone in the United States is 90. Assume the number of apps is normally distributed with a mean 90 and standard deviation 25. On the axis above, do parts A-F. A. Sketch a normal curve. (3 pt) B. Label the axis with correct letter (z, x or x) to represent a normal distribution. (3pts) C. Label the axis with the mean value (given in the problem). (2pts) D. Label the axis with the other 6 values (the values that represent 1,2, and 3 standard deviations away from the mean). (6pts) E. Mark the value of 85 on the axis and write 85 under the axis. (2pts) F. Shade the area under the curve that corresponds to "less than 85". (2pts) G. Find the probability that a randomly selected smartphone will have less than 85 apps on it. Round to 4 decimal places. Show your work or what you enter into a calculator. (8 pts)
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. Find the mean, median and mode. b. If the value 15.75 was incorrectly written as 45.75, what measure of central tendency will be affected? Support your answer. c. Compute for the semi-interquartile range,absolute deviation, variance and standard deviation of test.
39
7. Calculate -scores for the following raw scores taken from a population with a mean of 100 and standard deviation of 16: 112, 109, 56, 88, 135, 99 Answer: 2 = 0.75, 0.56, -2.75, -0.75, 2.19, -0.06 show work for these please
The distribution of the number of motor vehicles per household in the United States (the population) and sampling distributions of the mean for samples of size 4 and 10 are shown in below. A.Which distribution is which? Make a rough estimate of the mean and standard deviation of each distribution. Explain the reasons of your choices.b. The mean of the population is about 1.7. Theoretically, what is the mean of the sampling distribution for samples of size 4? Of size 10? Are these computed means consistent with your estimates of the means in the histograms? Briefly explain.c. The standard deviation of the population is about 1. Theoretically, what is the Standard Error (SE) of the sampling distribution for samples of size 4? Of size 10? Are these computed SEs consistent with your estimates of the SEs in the histograms? Briefly explain.d. Compare the shapes of the three distributions. Are the shapes consistent with the Central Limit Theorem? Briefly explain.
1. The mean age for licensed physicians in the United States is 51.5 years. A government officialrandomly selects 700 licensed physicians and computes their mean age to be 50.9 years.a. Which value is the parameter and which the statistic? b. Is it unreasonable that the mean of the 700 physicians is different than 51.5? Explain.
Mr 8. The results for an IQ quiz taken by 8 students from Ze Class A and Class B are shown below. The fal maximum score for the quiz is 25. we Class A: 4, 6, 6, 7, 8, 10, 11, 12 Class B: 0, 1, 1, 2, 3, 14, 17, 25 (i) Calculate the mean and standard deviation for Class A and Class B. Show your working clearly.
2???
38. Pregnancy Lengths. Lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. a. What percentage of pregnancies last less than 250 days? b. What percentage of pregmancies last more than 300 days? (continued)
42. The speeds of vehicles on a certain part of a highway are normally distributed with a mean of 60 mph and a standard deviation of 6 mph. Use the Empirical Rule to answer the following questions. a. Approximately what percentage of vehicles travel at a speed between 54 mph and 66 mph? b. Approximately what percentage of vehicles travel at a speed greater than 72 mph? c. Approximately what percentage of vehicles travel at a speed not greater than 78 mph?

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