QUESTION 2Samuel Morse determined that the percentage of "t's" in the English language in 1836 was 10%. A researcher interested in testing whether the percentage has changed since 1836 took a randomsample of 750 letters from the 4/5/20 issue of the New York Times, finding it contained 90 "t's."Which of the equations below is the proper way to calculate the test statistic?O A.0.10 0.12O B.OC.O D."000.12(1-0.12)7500.12 -0.100.10(10.10)7500.10 0.120.12(1-0.12)900.12 -0.100.10(10.10)90

Population proportion of letter t in English P=10%=0.10 Sample of size n=750 in which number of t's…

Answered: Samuel Morse determined that 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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A standardized math test of fifth grade students produces a mean ?μ = 100 with a ?σ = 18. A sample of n = 36 students participated in "boost" training for their math skills. The sample M = 104 with S = 24. Did this "boost" training significantly improve students' math performance? Use ?α = .01.
Given the ?????????? ???? = 100 ??? ???????? ????????? = 10 in The College of Maasin entrance examination, find the corresponding z-value of the scores gained by the following students. a. ? = 98b. ? = 120
13
Consider the data from the Anthropology 105 class. The mean for women is 64.33 in and the standard deviation is 2.64 in. The average height of men in the US is approximately 5ft 10in. What proportion of women represented here are shorter than the average man?
Note: For this problem, your answer should be rounded to two decimal places. In a particular municipality, it is believed that 25 percent of homes are not properly insulated. In order to test ?0:?=.25 vs. ??:?≠.25 (where ? is the population proportion of homes that are not properly insulated) a random sample of 300 homes was selected. In the sample, it was found that 108 homes were not properly insulated. If the null hypothesis is true, then the z-score for the sample proportion is:
QUESTION 11 The Inspector at a manufacturing company claims that more than 2% of the produced smoke delectors are defective. A random sample of 255 smoke detectors is selected of which 10 are defective. Find the p-value of the test. (Round your answer to three decimal places).
QUESTION 3 Based on the Normal model, with a mean of 100 and a standard deviation of 16 describing IQ scores, what percent of people's IQs would you expect to be: a. Over 80? b. Under 90? c. Between 112 and 132?
Question 10 The empirical rule states that 99% of the population is within [A] standard deviation(s). Answer in number format
QUESTION 10 Solve the problem. Find the standardized test statistic t for a sample with n = 12, x = 20.6, s = 2.1, and a = 0.01 if Ha: H 21.1. Round your answer to three decimal places. O a. -0.825 O b. -0.037 OC. -0.381 O d.-0.008
QUESTION 8 A random sample of 25 children is selected and each is given several pieces of Yummy Gummy candy Twenty-two of the children indicated they like the candy ASsuming 95% Jevel of confidence, what is the approximate margin of error in estimating the true proportion of children that like Yummy Gummy candy? O a. 0.004 O b.0.06 OC0 13 O d.0.64
QUESTION 7 A random sample of 1000 college applications showed that 747 (of those applications were submitted online. Compute the test statistic used to test the claim that among all college applications the percentage submitted online is equal to 75%. Round your answer to three decimal places.
Question 3 Assume that s = 15 for the IQ scores. Find the sample size needed to estimate the mean IQ of a group of students, given that we want 98% confidence that the sample mean is within 3 IQ points of the population mean.

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