A sample of 100 cars driving on a freeway during a morning commute was drawn, and thenumber of occupants in each car was recorded. The results were as follows:Occupants 1 2 3 4 5Number of Cars 70 15 10 3 2Find the sample mean number of occupants.Find the sample standard deviation of the number of occupants.Find the sample median number of occupants.a.b.C.d.Compute the first and third quartiles of the number of occupants.What proportion of cars had more than the mean number of occupants?For what proportion of cars was the number of occupants more than one standarddeviation greater than the mean?For what proportion of cars was the number of occupants within one standarde.f.g.deviation of the mean?

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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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You and your two friends paid the following amounts for a new MP3 player: $165, $210, and $225. A. What is the mean and standard deviation of the population of you and your friends? Mean (round to the nearest penny): u = $200 Standard Deviation (round to the penny): o = $31.22 B. Complete the table using the sample size of two prices, with replacement. x1, x2 Ex 165, 330 165 165 165, 375 187.5 210 165, 390 195 225 210, 187.5 375 165 210, 210 420 210 210, 435 217.5 225 225, 390 195 165 225, 435 217.5 210 225, 450 225
Consider a sample with data values of 27, 25, 20, 15, 30, 34, 28, and 25. Compute the 20th, 25th, 60th, and 70th percentiles. If needed, round your answers to two decimal digits.
Consider the following sample data: 6, 10, 4, 3, 7, 9, 21, and 14. What is the variance? Select one: a. 34.79 b. 33.56 c. 34.21 d. 34.02
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.
Find the mean and standard deviation of the following sample: 7.2 7.4 7.5 7.2 7.1 6.9 7.7 7.4
The average speed of 1500 vehicles traveled on a stretch of highway that day is 67 miles per hour with a standard deviation of 3.5 miles per hour. If 100 vehicles are randomly selected as samples, what would be the standard error of the resulting sampling distribution of sample means? 0.34 0.25 0.43 O 0.52
A developmental psychologist is interested in studying how long babies gaze at a photograph of a human face. To test this question, she shows a picture to a sample of six babies and records the length of their gaze in seconds. The data are as follows: 12, 17, 18, 20, 20, 29. Calculate the mean, median, mode, range, variance and standard deviation for the sample.
Given the data set below find the following; 45, 34, 65, 20, 15, 25 a. Compute the sample mean b. Compute the sample standard deviation c. Compute the standard error of the mean.
Consider a sample with data values of 57,45,50,39,50,59,60, and 48. Compute the following values a. Mode b. 40th percentile c. Variance d. Standard deviation e. Coefficient of variation
Suppose six pet food stores in the area were surveyed, and the following data shows how many types of pet food each of them carries. 7,7,9, 9, 11, 11 Calculate the sample mean and the sample standard deviation. Round your answers to three decimal places. T = Number Number S=
In Country A, the population mean height for 3-year-old boys is 37 inches. Suppose a random sample of 15 3-year-old boys from Country B showed a sample mean of 36.8 inches with a standard deviation of 2 inches. The boys were independently sampled. Assume that heights are Normally distributed in the population. Complete parts a through c below. a. Determine whether the population mean for Country B boys is significantly different from the Country A mean. Use a significance level of 0.05. Which of the following correctly states Ho and Ha? Ho: µ#37 O A. Ho: μz37 Oc. H3i µ 37 OB. Hai H=37 Hai us37 Ho: H = 37 Ha:µ 37 Ho: µ= 37 Ha: H#37 Find the test statistic. t= -0.39 (Type an integer or decimal rounded to two decimal places as needed.) Find the p-value. p (Type an integer or decimal rounded to three decimal places as needed.)
Find the sample mean x̄, median, variance s2, and standard deviation s of the following data: 15 10 25 12 40

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