2% of the world population is naturally blond. In a random sample of 100 people, the proportion of natural blonds is found. The sampling distribution ofisO A. approximately normal because p is always approximately normalO B. not approximately normal because np < 5O C. approximately normal because the sample size is more than 30O D. normal because ,is always normalO E. approximately normal because n(1-p) > 5

Answered: 2% of the world population is naturally…

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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If you selected a sample of n = 35 from a population whose μ = 56 and σ= 12, what would you expect the sample mean to be?
K- If you want to be 99% confident of estimating the population proportion to within a sampling error of ±0.05, what sample size is needed? D A sample size of is needed (Round up to the nearest integer.)
The national distribution of fatal work injuries in a country is shown in the table to the right under National %. You believe that the distribution of fatal work injuries is different in the western part of the country and randomly select 6231 fatal work injuries occurring in that region. At alpha equals 0.10 can you conclude that the distribution of fatal work injuries in the west is different from the national distribution? Complete parts a through d below. Cause National % Western Frequency Transportation 42 % 2894 Equipment 17 % 1158 Assaults 15 % 805 Falls 14 % 751 Harmful fumes 9 % 535 Fires 3 % 88 a. State Upper H 0 and Upper H Subscript a and identify the claim. What is the null hypothesis, Upper H 0 ? A. The distribution of fatal work injuries in the west is 2894 transportation,…
PQ4
1. Of all customers purchasing automatic garage-door openers, 57% purchase a chain-driven model. Let X = the number among the next 15 purchasers who select the chain-driven model. a. Calculate P(X > 10). b. Calculate P(8
7. 40% of consumers believe that cash will be obsolete in the next 20 years based on a survey by J.P. Morgan Chase. Eight consumers are randomly selected and the number who believe cash will be obsolete is recorded. X 0 1 2 3 4 5 6 7 8 P(x) 0.017 0.090 0.209 0.124 0.041 0.008 0.001 Fill in the missing values from the table and identify each of the following characteristics used to construct the distribution: n= p= Discuss the three characteristics of the distribution. Shape: Center: Spread: Find the probability that exactly 4 people believe that cash will be obsolete. Find the probability that between 3 and 7 people believe that cash will be obsolete. Find the probability that at most 3 people believe that cash will be obsolete. x=
The scores on a standardized mathematics test for 8th-grade children in New York State form a normal distribution with a mean of m= 70 and a SD=10. a. What proportion of the students in the state have scores less than X=75? b. If samples of n=4 are selected from the population, what proportion of the samples will have means less than M=75? c. If samples of n=25 are selected from the population, what proportion of the samples will have means less than M=75?
The national distribution of fatal work injuries in a country is shown in the table to the right under National %. You believe that the distribution of fatal work injuries is different in the western part of the country and randomly select 6231 fatal work injuries occuring in that region. At a = 0.05 can you conclude that the distribution of fatal work injuries in the west is different from the national distribution? Complete parts a through d below. Equipment Cause National % 44% Western Frequency Transportation 2895 18% 1160 Assaults Falls Harmful fumes 14% 803 13% 754 9% 532 Fires 2% 87 O B. The distribution of fatal work injuries in the west is the same as the expected distribution. O C. The distribution of fatal work injuries in the west is 44% transportation, 18% equipment, 14% assaults, 13% falls, 9% harmful fumes, and 2% fires. Which hypothesis is the claim? O Ho V H. b. Determine the critical value, Yo. and the rejection region. Y = 11.071 (Round to three decimal places as…
The Census Bureau gives this distribution for the number of people in American households in 2016. Family size 1 2 4 6. 7 Proportion 0.28 0.35 0.15 0.13 0.06 0.02 0.01 Note: In this table, 7 actually represents households of size 7 or greater. But for purposes of this exercise, assume that it means only households of size exactly 7. Suppose you take a random sample of 4000 American households. About how many of these households will be of size 2? Sizes 3 to 7? The number of households of size 2 is about The number of households of size 3 to 7 is about
Three randomly selected children are surveyed. The ages of the children are 2, 3, and 10. Assume that samples of size n = 2 are randomly selected with replacement from the population of 2, 3, and 10. Listed below are the nine different samples. Complete parts (a) through (d). 2,2 2,3 2,10 3,2 3,3 3,10 10,2 10,3 10,10 a. Find the value of the population variance o². (Round to three decimal places as needed.)
Simple Random Sampling
A fair coin is tossed three times. Let X denote 0 or 1 according as a head or a Tail occurs onthe first toss, and let Y denote the number of heads which occur. Determine the following: a. the distribution of X and Y;b. E(X) and E(Y);c. Variance and SD of X; andd. Variance and SD of Y

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