ceway is normally distributed with mean 70 mph and a standard deviation of 8a. What percentage of vehicles have speed between 60 mph and 82 mph?b. Police decide to issue tickets to top 1% speeders. What the maximum speed one can drive to avoidreceiving a ticket.8. In a random sample of 400 Lyon county residents, only 80 support a property tax increase.a. Find the 95% confidence interval for the proportion of residents who support property tax increase.Interpret the interval.b. County official thinks the margin of error is too large, Estimate the sample size needed so thatmargin of error does not exceed 1%.

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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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1. According to one study, the average hours of sleep on a weeknight for men was 6.9 hours with a standard deviation of 1.5 hours. a. Find the proportion of men who sleep for more than 8 hours per night. b. Find the proportion of men who sleep for less than 6 hours per night. c. Find the proportion of men who sleep between 6-8 hours per night. d. Find the number of hours that represents the 90th percentile.
Consider the following sample: 1, 4, 7, 2, 6. How does the standard deviation change when the 7 is replaced with a 12? Answer intuitively first, and then check your answers numerically.
If the mean speed for a major league fast ball is 90 miles per hour and the standard deviation is 5 miles per hour, what would the standardized score be for a pitch that is 97 miles per hour? O 0.4 4.0 1.4 O 1.0
1. The EPA fuel economy estimates for automobile models tested recently predicted a mean of 24.8 mpg and a standard deviation of 6.2 mpg for highway driving. a. About what percent of cars get less than 31 mpg? b. What percent of cars get more than 20 mpg? c. What percent of cars get between 22 and 30 mpg? d. What gas mileage represents the 75th percentile? e. What gas mileages separate the bottom 3% and top 3% of cars? X
Define measure of dispersion and their types. Find the Absolute Quartile Deviation for the following data. 024, 384, 591, 407, 672, 522, 777, 733, 1490, 2488
Review(19a): The mean of a distribution is 35. The median is 30. The mode is 25. The distribution is (a) negatively skewed (b) positively skewed (c) symmetric (d) both b anc c (e) There is two little information given to determine the shape of the distribution.
Consider the following data of 10 exams scores: 28, 57, 58, 64, 69, 74, 79, 80, 83, 85 1. The the mean, median, and mode 2. find the standard deviation without a graphing calculator. Show all your computations
MC Qu. 10-64 Sales at a fast-food restaurant average... Sales at a fast-food restaurant average $6,000 per day. The restaurant decided to introduce an advertising campaign to Increase daily sales. In order to determine the effectiveness of the advertising campaign, a sample of 49 day's sales were taken. The sample showed average daily sales of $6,300. From past history, the restaurant knew that its population standard deviation is about $1,000. If the level of significance is 0.01, have sales increased as a result of the advertising campaign? Multiple Choice Fail to reject the null hypothesis. Reject the null hypothesis and conclude the mean is higher than $6,000 per day. Reject the null hypothesis and conclude the mean is lower than $6,000 per day. Reject the null hypothesis and conclude that mean equal to $6,000 per day.
A. Create a Histogram B. What is the sample mean of the data C. What is the sample standard deviation of the data
Given the set of data: {77, X, 75, 79, 79, X, 76, 75, X, 76}. If the unknown data X is the mode and the mean of the data set is 77.10. Determine the: (a) Mode (b) Median (c) Standard Deviation.
Which is cheaper: eating out or dining in? The mean cost of a flank steak, broccoli, and rice bought at the grocery store is $13.04 (Money.msn website, November 7, 2012). A sample of 100 neighborhood restaurants showed a mean price of $12.75 and a standard deviation of $2 for a comparable restaurant meal. Answer questions 4-7.
Imagine the mean women’s foot size is a 7.5 with standard deviations of 1.5. a. What percentage of women have a foot size larger than 10? b. If you select 30 people at random is it likely that any of them will have a foot size larger than 10? If so, how many?

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