In a memory test, the test subjects are shown 400 objects and are asked after two hours to name the objects. The historical records show that test subjectsremember 80% of the objects after two hours.Answer the following. (If necessary, consult a list of formulas.)(a) Find the mean of p, where p is the proportion of objects that are remembered by a test subject.?(b) Find the standard deviation of p.(c) Compute an approximation for P(p <0.81), which is the probability that fewer than 81% of the objects areremembered by a test subject. Round your answer to four decimal places.

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Answered: In a memory test, the test subjects are…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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The mean for statistics test scores is 61 and the standard deviation is 6.0. For the biology test scores, the mean is 22 and the standard devaton is 3.7. The tent scores of stutent who took boh tests are ven belw A student gets a 74 on the statistics test and a 24 on the biology test. (a) Tranaform each test score to a z-Bcore. (b) Determine on which test the student had a better score (a) Transform the statistios test soore to a z-acore. (Type an integer or decimal rounded to the nearest hundredth as needed.)
For a sample with a standard deviation of s = 12, a score of X = 42 corresponds to z = –0.50. The mean for the sample is M = ___. a. 48 b. 45 c. 40 d. 36
PS. 4 DECIMAL PLACES IF THE ANSWER HAVE A DECIMAL MORE THAN 4, THANK YOU!
A researcher wants to investigate the effects of environmental factors on IQ scores. For an initial study, she takes a sample of 400 people who grew up as the only child. She finds that 51.5% of them have an IQ score over 100. It is known that 50% of the general population has an IQ score exceeding 100. Answer the following. (If necessary, consult a list of formulas.) (a) Find the mean of p, where p is the proportion of people with IQ scores over 100 in a random sample of 400 people. (b) Find the standard deviation of p. (c) Compute an approximation for P(p 20.515), which is the probability that there will be 51.5% or more individuals with IQ scores over 100 in a random sample of 400. Round your answer to four decimal places.
One of the z-score formulas will help on this question. Scores on the SAT test are normally distributed with a mean of 500 and standard deviation of 100 points. Pretend someone scored 400 on the math portion of the SAT test. What would be the z-score cut off for this score? A. 1.0 B. -1.0 C. 0 D. 2.0
Find the indicated IQ score. The graph to the right depicts IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15. The indicated IQ score is (Round to the nearest whole number as needed.) si 0.2525 Q
A researcher wants to investigate the effects of environmental factors on IQ scores. For an initial study, she takes a sample of 400 people who grew up as the only child. She finds that 49.5% of them have an IQ score over 100. It is known that 50% of the general population has an IQ score exceeding 100. Answer the following. (If necessary, consult a list of formulas.) (a) Find the mean of p, where p is the proportion of people with IQ scores over 100 in a random sample of 400 people. (b) Find the standard deviation of p. |(c) Compute an approximation for P(p 20.495), which is the probability that there will be 49.5% or more individuals with IQ scores over 100 in a random sample of 400. Round your answer to four decimal places.
Find the indicated IQ score. The graph to the right depicts IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15. Click to view page 1 of the table. Click to view page 2of tihe fable 0.9 The indicated IQ score, x, is (Round to one decimal place as needed.)
A researcher wants to investigate the effects of environmental factors on IQ scores. For an initial study, she takes a sample of 400 people who grew up as the only child. She finds that 51.5% of them have an IQ score over 100. It is known that 50% of the general population has an IQ score exceeding 100. Answer the following. (If necessary, consult a list of formulas.) (a)Find the mean of p, where p is the proportion of people with IQ scores over 100 in a random sample of 400 people. (b)Find the standard deviation of p. (c)Compute an approximation for P≥p0.515, which is the probability that there will be 51.5% or more individuals with IQ scores over 100 in a random sample of 400. Round your answer to four decimal places.
find the standard deviation based on the following given where you have three states: good, average and poor where Ps are 30%,50% and 20% and Rs are 20%, 15% and -4% respectively-? a. 0.0074 b. 0.0278 c. 0.127 d. 0.167
By studying the standard deviation fomula, given below, explain why the standard deviation of a set of data will always be greater than or equal to 0. E(x-x)? n-1 O A. The mean, x, will always be greater than or equal to 0. O B. The values of x will always be greater than or equal to 0. OC. The values of x-x will always be greater than or equal to 0.

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