a) What proportion of LSAT test takers have scores lower than 128? b) What proportion of applicants have exam scores lower than 50? **Placement Exam Analysis at Excellence Academy**All children who apply for admission to the Excellence Academy are given a placement exam. The distribution of placement exam scores is approximately normal with a mean of 65 and a standard deviation of 10.**Question:**What proportion of applicants have exam scores lower than 50?*Note: To find the proportion, consider using the properties of the normal distribution and the z-score formula to calculate the desired percentile.* The scores on the Law School Admissions Test (LSAT) are normally distributed with a mean of 150 and a standard deviation of 10.What proportion of LSAT test takers have scores lower than 128?

Given, μ=65σ=10x<50 To calculate proportion using z, z=x-μσ

Answered: All children who apply for admission to…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

1) In a survey of 1200 workers, 35% said they eat at home during a typical work week. A) What is the margin of error? B) Give an interval that is likely to contain the exact percent of all workers who eat at home. C) What number of workers responded that they eat at home during a typical work week?
You want to obtain a sample to estimate a percentage of Statistics students at ACM that get a grade of at least a C. You would like to be 90% confident that your estimate is within 1.5% of the true population proportion. a) You have no reasonable estimate for the population proportion. You do not know the number Statistics students at ACM. How large of a sample size is required? b) You estimate the population proportion to be 90 percent. You do not know the number Statistics students at ACM. How large of a sample size is required? c) You have no reasonable estimate for the population proportion. You know that there is a total of 800 Statistics students at ACM. How large of a sample size is required? d) You estimate the population proportion to be 90 percent. You know that there is a total of 800 Statistics students at ACM. How large of a sample size is required?
You want to obtain a sample to estimate a percentage of Statistics students at ACM that get a grade of at least a C. You would like to be 99.9% confident that your estimate is within 1% of the true population proportion. a) You have no reasonable estimate for the population proportion. You do not know the number Statistics students at ACM. How large of a sample size is required? b) You estimate the population proportion to be 77 percent. You do not know the number Statistics students at ACM. How large of a sample size is required? c) You have no reasonable estimate for the population proportion. You know that there is a total of 800 Statistics students at ACM. How large of a sample size is required? d) You estimate the population proportion to be 77 percent. You know that there is a total of 800 Statistics students at ACM. How large of a sample size is required?
A programmer plans to develop a new software system. In planning for the operating system that he will use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 99% confident that his estimate is in error by no more than five percentage points question mark a) Assume that nothing is known about the percentage of computers with new operating systems. (Round up to the nearest integer.) b) Assume that a recent survey suggests that about 92% of computers use a new operating system. (Round up to the nearest integer.)
1. Explain the difference between z-tests (which use categorical data), and t-tests (which use numerical data). 2. Conduct a t-test, both when given statistics, and when given data. 3. Conduct a t-test, 2-sample t-test, and paired t-test. 4. Differentiate between the five types of tests we have learned so far.
25.) 90% of all dogs have city licenses. If 7020 licenses have been issued, how many dogs are there in the city? 25.)
The mean age and median age of 5 people in a room is 40 years. A person whose age is 20 years leaves the room. a) If possible, determine the mean age of the remaining 4 people in the room. If it is not possible to find the mean age of the remaining 4 people, write "not possible" (without the quotes) as your answer. b) If possible, determine the median age of the remaining 4 people in the room. If it is not possible to find the median age of the remaining 4 people, write "not possible" (without the quotes) as your answer.
A programmer is planning to develop a new sohasem system in planning the operating system he will use to estimate the percentage of computers using the new operating system. How many computers need to be scanned in order to be 99% confident that his fate in Turbie is no more than three percentage points? b. Assume a recent survey indicates that about 87% of computers are in operating systems n. Rounding to the nearest whole number)
Regarding the context regarding the coronavirus pandemic, see the table below, which refers to 5 groups of people infected with the coronavirus and the number of deaths in each group. a) You, student, by observing the data tabulated in the table above, come to what conclusion about the absolute frequency of the second grade? b) João, a person observing the table, calculates and states that the relative frequency of the fourth class is 48.46% and informs that 48.46% of the number of deaths occurred in the group with the number greater than or equal to 70 and less than or equal to 80 infected. Do you agree with João's calculation and interpretation? If you agree or disagree, provide the calculation and interpretation that justifies your choice. c) Going deeper, Maria, another person who looks at the table, interprets that 16 deaths occurred in the group with a number greater than or equal to 40 and less than 70 infected people. When you see this interpretation that Maria made, do you…
Anna graduated as number 57 out of 362 students. Joshua graduated as number 29 out of 159 students. Use percentiles to determine which student has a higher position relative to their graduating class. a) What percentile is Anna in? (Enter your answer as a whole number). Answer b) What percentile is Joshua in? (Enter your answer as a whole number). Answer c) Answer has a higher position relative to their graduating class.
The drug Viagra became available in the U.S. in May 1988, in the wake of an advertising campaign that was unprecedented in scope and intensity. A Gallup poll found that by the end of the first week of May, 643 out of 1,005 adults were aware that Viagra was an impotency medication. a) What is the value of p̂? 1.56 0.36 0.6 0.64 b)What is the value of the standard error of p̂ for a confidence interval? 0.64 0.6 0.015 1.56
18. The governor of New York has banned selling or purchasing "large" soft drinks, where a "large" is defined as being more than 16 oz. Sonic, famous for its Route 44 drinks is interested in estimating the proportion of New Yorkers that favor this ban. From a random survey of 800 New Yorkers, 375 answered no to the question, “Do you favor the governor's ban on 'large' soft drinks?" a. Find a 97.5% confidence interval for the proportion of New Yorkers who favor the ban on "large" soft drinks. b. Interpret the confidence interval. c. Can you conclude with 97.5% confidence that a majority of New Yorkers favor the ban on "large" soft drinks? Why or why not. d. Without doing any other calculations, can you be 99% confident that a majority of New Yorkers favor the ban on “large" soft drinks?

SEE MORE QUESTIONS

Recommended textbooks for you

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

Elementary Statistics: Picturing the World (7th E…

Statistics

ISBN:

9780134683416

Author:

Ron Larson, Betsy Farber

Publisher:

PEARSON

The Basic Practice of Statistics

Statistics

ISBN:

9781319042578

Author:

David S. Moore, William I. Notz, Michael A. Fligner

Publisher:

W. H. Freeman

Introduction to the Practice of Statistics

Statistics

ISBN:

9781319013387

Author:

David S. Moore, George P. McCabe, Bruce A. Craig

Publisher:

W. H. Freeman

SEE MORE TEXTBOOKS

All children who apply for admission to the Excellence Academy are given a placement exam. The distribution of placement exam scores is approximately normal with a mean of 65 and a standard deviation of 10. What proportion of applicants have exam scores lower than 50?