A psychologist wants to determine whether the prevalence of peer problems ofadolescents vary by gender and age. Devise a method of selecting a sample of600 adolescents and explain the merits of this sampling technique over othermethods.b. The actual mean mass of ball bearings is 10.8 grams with standard deviation 0.2grams. A random sample of size n is chosen from this population. Find n if theprobability that the sample mean exceeds 10.82 grams is 0.006.1. a.

Given that: Mean = 10.8 gm Standard deviation = 0.2 Px¯>10.82=0.006

Answered: 1. a. A psychologist wants to determine…

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

4. Sampling distribution of the mean: The concentration of NOx (a set of criteria pollutants) in Los Angeles County has the following characteristics: µ = 700 ppm, σ = 30 ppm. [8 pts total] a. If you take 30 additional air samples, what is the probability that your sample mean will be greater than 710 ppm? Report 2 significant figures. % b. Discuss how increasing the sample size from 30 to 50 would affect the probability of the sample mean exceeding 710 ppm. What implications does this have for the accuracy of environmental monitoring? The probability would: Implications for environmental monitoring: O Increase O Decrease
Suppose we want to know the mean number of shurikens thrown each night by ninjas in Konoha village. Getting this information from every ninja in the village would take forever. Instead, we randomly select 20 ninjas from the ninja school that is closest to us. a. Describe the statistic of interest in this survey b. The method used to obtain the sample of ninjas above is an example of which of the following (i) convenience sampling (ii) voluntary response sampling (iii) stratified random sample (iv) multi-stage sampling
An auditor, examining a total of 820 accounts receivable of a corporation, took a random sample of 90 of them. The sample mean was $126.99, and the sample standard deviation was $44.21. Complete parts a through e. a. Using an unbiased estimation procedure, find an estimate of the population mean. An estimate of the population mean is $126.99. (Round to the nearest cent as needed.) b. Using an unbiased estimation procedure, find an estimate of the variance of the sample mean. An estimate of the variance of the sample mean is 19.357. (Round to three decimal places as needed.) c. Find a 90% confidence interval for the population mean. $119.68 <<$ 134.30 (Round to the nearest cent as needed.) d. A statistician found, for the population mean, a confidence interval running from $116.99 to $136.99. What is the probability content of this interval? The probability content is (Round to four decimal places as needed.)
The distribution of income in some Third World countries is considered very right skewed (many very poor people, very few middle income people, and even fewer wealthy people). Suppose we pick a country with a severely right skewed distribution. Let the average salary be $2,000 per year with a standard deviation of $8,000. We randomly survey 1,000 residents of that country. a. What is the sampling distribution of the sample mean, including name of the distribution, its mean, error, and standard ?
1. Stephen would like to check if his claim is true upon knowing that the average grade in Mathematics of his class is at least 85%. He got a sample from his classmates listed as follows: 93, 88 , 90,95 , 83, 85, 77 , 78 , 90, 80 a. What statistical tool is suited to determine if his class is true? Why? b. Assume that the distribution is normal, what would Stephen's conclusion be if the level of significance is 5%?
Consider a population of 250with a mean of 60 and a standard deviation equal to 26. What is the probability of obtaining a sample mean of 61 or less from a sample of 35? Click here to view page 1 of the Cumulative Standardized Normal Table. LOADING... Click here to view page 2 of the Cumulative Standardized Normal Table. LOADING... Question content area bottom Part 1 What is the probability of obtaining a sample mean of 61 or less from a sample of 35? P(x≤61)=enter your response here (Round to four decimal places as needed.)
Reebok is analyzing all the data from different stores across the globe to shut down the stores which are not having profit.After a lot of analysis, the mean and standard deviations were found. What is the percentage of distribution which is expected within two standard deviations from the mean to each side? Choose : A) 68% B) 65% C) 99.7% D) it depends on how big the sample size is.
To estimate the proportion of teen traffic deaths in Texas last year that was caused by speeding, determine the necessary sample size for the estimate to be accurate to within .05 with probability .99. a. Suppose from a previous study, we expect the proportion to be about .30. b. suppose we do not have any prior knowledge about the true proportion.
Suppose I want to sample the household incomes for EBR parish. Let's say I start with a simple random sample of 100 residents and calculate the sample mean. How would the sampling distribution of change if I increase the sample size to 1,000 residents?
The distribution of income in some Third World countries is considered very right skewed (many very poor people, very few middle income people, and even fewer wealthy people). Suppose we pick a country with a severely right skewed distribution. Let the average salary be $2,000 per year with a standard deviation of $8,000. We randomly survey 1,000 residents of that country. a. What is the sampling distribution of the sample mean, including name of the distribution, its mean, error, and standard ?
Samuel F.B. Morse (1791-1872), the creator of the Morse Code, claimed that 12 % of all letters used in English language were "e"s. Suppose random samples of 196 letters are selected from a book. Use this information to answer question below.
A hospital has a main campus and three satellite locations. Management wants to reduce waiting time for ER cases. A random sample of 11 ER cases at each location was selected, and the waiting time was measured. Excel.) Complete parts (a) through (d) to determine if there is statistical evidence of a difference in the mean waiting times betweeen the four locations. a. State the two hypotheses. Choose the correct answer below. O B. Ho: H1 = H2 = ••• = H4 H;: 41 H2# • • • # µ4 O A. Ho: H1 =H2 = ••• = H4 H;: Not all H are equal (where j= 1,2,.4) OC. Họ: H1 = H2 = • •• = H1 H;: 41 # H2# • •• #H11 D. Ho: H1 = H2= • •• - H11 H;: Not all H; are equal (where j= 1,2,.,11) b. At the 0.05 level of significance, state the test statistic. (Round to two decimal places to the right of the decimal point as needed.) O A. FSTAT = 0.005 , from the first row of the ANOVA table O B. FSTAT = 4.91 , from the first row of the ANOVA table O C. FSTAT = 2.05 , from the first row of the ANOVA table O D. FSTAT =…

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