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 theonly child. She finds that 53% 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, wherep is the proportion of people with IQ scores over 100 in a random ample of 400 people.(b) Find the standard deviation of p.(c) Compute an approximation for P(p 20.53), which is the probability that there will be 53% or more individuals withIQ scores over 100 in a random sample of 400. Round your answer to four decimal places.

Answered: Image /qna-images/answer/8c179632-c3b6-415c-99f1-1e6b3057a9ff.jpg

Answered: A researcher wants to investigate the…

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 results above were obtained because the sample means are close together. To construct the data set below, the same scores from above were used, then the size of the mean differences were increased. In particular, the first treatment scores were lowered by 2 points, and the third treatment scores were raised by 2 points. As a result, the three sample means are now much more spread out. Before you begin the calculation, predict how the changes in the data should influence the outcome of the analysis. That is, how will the F-ratio for these data compare with the F-ratio from above? TTT Treatment A Treatment B Treatment C 10 13 17 14 15 16 10 17 20 14 15 19 F-ratio = p-value Conclusion: O There is a significant difference between treatments O These data do not provide evidence of a difference between the treatments Submit Question Ce
For each problem, you must state the hypotheses, calculate the test statistic, and explain your decision. A sample of 25 cities have been classified as high or low on their homicide rates and on the number of handguns sold within the city limits: a. The table is constructed assuming that homicide rate is the independent variable. Please add %s in the appropriate position (columns or rows) to describe the pattern of the relationship. b. Is there a statistically significant relationship between these variables?
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A sample of n = 11 scores has a mean of M = 55. One new score is added to the sample and the new mean is computed to be M = 53. What is the value of the score that was added to the sample?
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Español Ten percent of the world's population is left-handed. A researcher claims that left-handed individuals are more creative than those who aren't left-handed. In order to support his claim, he takes a sample of 900 artists and finds that 11 % of them are left-handed. Answer the following. (If necessary, consult a list of formulas.) (a) Find the mean of p, where p is the proportion of left-handed individuals in a random sample of 圖 900. 0.10 (b) Find the standard deviation of p. 0.01 Aa (c) Compute an approximation for P(p<0.11 ), which is the probability that there will be 11 % or fewer left-handed people in a random sample of 900. Round your answer to four decimal places. AM svg Explanation Check © 2022 McGraw Hill LLC. AlI Rights Reserved. Terms of Use | Privacy Center| Accessibility **** . ... MacBook Air DII 80 F9 F10 F11 F4 FS F6 F1 F2 F3 @ 23 $ & 4 7 Q E R T Y P

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