6. Professor Y conducted a periodic examination to all his students enrolled in Mathematics 11. The scoresare normally distributed with a population standard deviation of 10. Professor Y randomly selected 125students and obtained a mean score of 60.a) What is the point estimate of population mean?b) At 95% confidence level, what is the margin of error?c) Find 95% confidence interval for the population mean.

Given that, Professor Y conducted a periodic examination to all his students enrolled in Mathematics…

Answered: 6. Professor Y conducted a periodic…

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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Use the confidence level and sample data to find a confidence interval for estimating the population μ. Round your answer to two decimals. 13) A random sample of 100 individuals, their blood glucose level has been measured, obtaining a mean of 120 mg/dl and a standard deviation of 30 mg/dl. a) What is the best point estimate of the population mean? b) Construct a 95% confidence interval for the mean blood glucose level of all individuals in this population.
11. In order to estimate the mean amount of time computer users spend on the internet 10 each month, how many computer users must be surveyed in order to be 95% confident that your sample mean is within 11 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the internet is 201 min. The minimum sample size required is computer users. What is a major obstacle to getting a good estimate of the population mean? O A. There may not be 1,283 computer users to survey. O B. It is difficult to precisely measure the amount of time spent on the internet, invalidating some data values. O C. The data does not provide information on what the computer users did while on the internet. O D. There are no obstacles to getting a good estimate of the population mean.
27. In a random sample of six mobile devices, the mean repair cost was $65.00 and the standard deviation was $14.00. Assume the population is normally distributed and use a t-distribution to find the margin of error and construct a 90% confidence interval for the population mean. Interpret the results.
14.) A researcher would like to estimate the mean weight of all adult female American alligators in the Everglades. The mean weight of a random sample of 146 adult female American alligators from the Everglades was found to be 217 pounds. The standard deviation of the weights of all adult female American alligators in the Everglades is known to be 16 pounds.Using a 96% confidence level, determine the margin of error, EE, and a confidence interval for the mean weight of all adult female American alligators in the Everglades. Report the confidence interval using interval notation. Round solutions to two decimal places, if necessary.The margin of error is given by E= ___A 96% confidence interval is given by ___
1- A researcher makes a research about the life time of batteries which have a normal distribution. In order to understand the life time of batteries s/he randomly selected 49 batteries and calculate the sample mean as 48 hours and standard deviation of 5 hours. Construct 90 % confidence interval for the true population mean of life time of batteries.
1. The number of motorcycles sold manually by salesperson is normally distributed with a standard deviation of 15. A random sample of 300 salesperson taken and the mean number of motorcycles sold manually was found to be 75. Find the 99% confidence interval estimate of the population mean. Answer: 73-77 Just show solution on how to get that answer.
13) In a class of 20 students, the heights of the students have a mean of 67.4 inches and a standard deviation of 3.0 inches. The tallest student in class, a hopeful member of the basketball team, claims to be 79.8 inches tall. Is he significantly tall in his class? Work:
6. In Roosevelt National Forest, the rangers took random samples of live a) aspen trees and measured the base circumference of each tree. A sample of 36 trees had a mean circumference of 15.71 inches and a population standard deviation of 4.63 inches. Find a 98% confidence interval for the mean circumference of all aspen trees in Roosevelt National Forest from this data. b) 16.475) inches. What confidence level was used to produce this interval? Suppose a confidence interval constructed from this data was (14.945,
The lengths of pregnancies in a small rural village are normally distributed with a mean of 269 days and a standard deviation of 16 days. a) In what range would you expect to find the middle 68% of most pregnancies? Between and b) If you were to draw samples of size 38 from this population, in what range would you expect to find the middle 68% of most averages for the lengths of pregnancies in the sample? Between and Enter your answers as numbers. Your answers should be accurate to one decimal places. Submit Question ロI & #3 2$ 6 7 8. 2 3 4 y e d f h づ
8
Suppose that we have a set of 1000 values with average 4, and standard deviation 3. (This is population data). a) The sum of the values of this set is b) The sum of squares of deviations from the average of the values is c) The sum of squares of the values is d) If the data has an empirical histogram, 7 is approximately the integer as the answer). th percentile (Give an The 97.5th percentile is approximately (Give an integer as the answer). e) If the histogram of the data is unknown, the (100 * ) th percentile is at most
3. a researcher sampled 50 doctors to obtain a mean of 145,580 pesos, and standard deviation of 13,200 pesos. Construct a 95% confidence interval to estimate the yearly average income of doctors.

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