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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Twenty-six percent of all automobiles undergoing an emissions inspection at a certain inspection station fail the inspection. Suppose 20 randomly selected cars are tested. Round all answers three decimal places. 1)Find the mean number of cars which will fail the inspection.2) Find the standard deviation of the number of cars that will fail the inspection.
Help me to find the answer
ACT Scores Based on the Normal model (mean = 20.8 and standard deviation = 4.8), describing ACT scores for Kentucky high school seniors. a) what percent scores would you expect to be over 22 (minimum admission for most state schools except Kentucky State and Uni. of Kentucky)? Draw a picture. b) what percent of scores would you expect ot be below 17 (minimum for admission to the rest of the state schools not mentioned). Draw a picture 3) what act score represents the 90th percentile? Draw a picture.
25. The average amount of time men and women spend practicing meditation in Nepal resort each week is believed to be the same. A study is done and data are collected, resulting in the data in the table below. Each population has a normal distribution. Is there a difference in the mean amount of time men and women practice meditation every week? Test at the 5% level of significance.(populations standard deviations are assumed unegqual). Average Number of Hours Practicing Tmeditation Per week Sample Standard Deviation Sannie Size 0.866 Women Men p-value is p = 0.0054 the df-18.8466 p-value is p =0.05, the dfe 20.8466 O p-value is p= 0.02, the df= 18.8466 p-value is p= 0 001, the df= 12.8466
12.) The FAA has to periodically revise their rules regarding weight estimates. Airlines use anestimate for the weight of a passenger of 195 lbs. (an adult traveling in winter including 20 lbs.of baggage). According to your textbook, assume that men (not carrying baggage) have weightsthat are normally distributed with a mean of 188.6 lbs. and a standard deviation of 38.9 lbs.a.) If one adult male is randomly selected and is assumed to be carrying 20 lbs. carry-onbaggage, find the probability that the total weight is greater than 195 lbs.b.) What total weight would separate the lower 20% of men carrying 20 lbs. of baggage fromthe top 80%?
4
4. A medical statistician wants to estimate the average weight loss of people who are on a new diet plan. In a preliminary study, he guesses that the standard deviation of weight loss is about 10 pounds. How large a sample should he take to estimate the mean weight loss to within 2 pounds, with a 90% confidence.
3.) An insurance company is trying to estimate the number of sick days used yearly for high school teachers. A pilot study found the standard deviation to be 3.5 days. How large a sample must be selected if the company wants to be 95% confident, with a Margin of Error of 1 day. find the Point Estimate, z or t score and Margin of Error:
Dylan has collected 20 quarters and wants to compare the age of each coin to the age of all coins in the US. Select all the reasons why a z-test should not be used. Choose all that apply: 1. The sample standard deviation cannot be calculated 2. The sample size is >10 3. We do not have the population standard deviation 4. The sample size is <30 5. The population is <500
13)Many graduate schools require applicants to take the GRE for admission. The mean GRE score worldwide is 149.7 with a standard deviation of 8.2. The recommended overall GRE score for admission at UC Berkeley is 153 Q) If an applicant were to obtain a score of 123, how many standard deviations away is this score from the mean?
36. Packages of Lay's Potato Chips have a population standard deviation of 0.16 ounces. An SRS of 100 bags of Lay's Potato Chips have a sample mean of 18.024 ounces. What is the Standard Error for the average weight of the bags of Lay's Potato Chips ?
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 ___

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