A)Find the sample standard deviationB)construct a 95% confidence interval The state test scores for 12 randomly selected high school seniorsare shown on the right. Complete parts (a) through (c) below.Assume the population is normally distributed.142369772262012247307411443988839549946

The provided information is as follows:The total number of state test scores for randomly selected…

Answered: The state test scores for 12 randomly…

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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The Highway Safety Department wants to study the driving habits of individuals. A sample of 81 cars traveling on the highway revealed an average speed of 67 miles per hour with a standard deviation of 9 miles per hour. a. Compute the standard error of the mean. b. Determine a 99% confidence interval estimate for the speed of all cars.
An emergency planning administrator needs an estimate of the mean weight of relief vehicles when fully loaded. She selects a random sample of 500 trucks and finds a mean of 12.2 tons with a sample standard deviation of 2.9 tons. The width of the 95 percent confidence interval for the population mean is (enter the correct answer rounding to two significant digits (e.g. 3.14)) ?
Suppose a study was conducted of community colleges in California to determine the average cost of tuition for in-state students. The study consisted of 45 community colleges from California. Based on the sample data, the average tuition was $1,440 and the standard deviation was $267. Use this information to construct and interpret a 92% confidence interval for the true average tuition of all California community colleges. Make sure to check any relevant assumptions and state how you determined whether or not they were satisfied (Be as specific as possible). Make sure to type your confidence interval in an interval format with each bound rounded to 3 decimal places [i.e. (12.345, 45.678)]
The average annual cost of books for a random sample of 20 college students in both public and private schools was $1114. Assuming that the population standard deviation is $186 and the distribution is approximately normal, construct a 92% confidence interval for the mean annual cost of books for both public and private schools. The average annual cost of books for a random sample of 20 college students in both public and private schools was $1114. Assuming that the population standard deviation is $186 and the distribution is approximately normal, construct a 92% confidence interval for the mean annual cost of books for both public and private schools. (1041.2, 1186.8) (1045.6, 1182.4) (1032.5, 1195.5) (1037.1, 1190.9) (1026.9, 1201.1)
College tuition: A simple random sample of 40 colleges and universities in New York State has a mean tuition of $30,503 with a standard deviation of $6,372. Construct an 80% confidence interval for the mean tuition for all colleges and universities in New York State. An 80% confidence interval for the mean tuition for all colleges and universities is
Calculate the 95% confidence interval and record the upper and lower limits with the following information. Interpret confidence interval Mean=15.83 Standard deviation= 7.83 Sample size= 10
The instructorTanner is concerned about the amount of time teachers spend each week doing schoolwork at home. A simple random sample of 56 teachers had a mean of 8.0 hours per week working at home after school. Construct and interpret a 95% confidence interval for the mean number of hours per week a teacher spends working at home. Assume that the population standard deviation is 1.5 hours per week.
A. Find the sample meanB. Find the sample standard deviation C. Construct a 98% confidence interval for the population mean(please show what numbers you are putting into the formula for part b)
Calculate the 95% confidence interval and record the lower and upper limits from the following: Mean= 24.74 Standard Deviation= 14.37 Sample Size= 8
1. At the 95% confidence what is the margin of error? 2. Determine a 95% confidence interval estimate for the mean weight of the carry on luggage
Calculate a 90% lower confidence bound for the population mean using the following sample statistics: x=118.7 , s= 136.0 , n=37. Use one-decimal place accuracy.

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The state test scores for 12 randomly selected high school seniors are shown on the right. Complete parts (a) through (c) below. Assume the population is normally distributed. 1423 697 722 620 1224 730 741 1443 988 839 549 946 0