ll Verizon3:28 PM© 56%Chapter 8 Assign...Chapters 8 Assignment1. A random sample of 100 households in Whatcom County yielded an average household incomeof $86,000, with a sample standard deviation of $3,600. Assume the distribution of householdincome is Normal,a. Use this information to compute a 95% confidence interval for the population meanhousehold income in Whatcom County. Please clearly show that you checked to make surethe data meet all necessary conditions for inference.b. Interpret the meaning of the confidence interval you found in part a in the context of thisapplication.00000DashboardCalendarTo DoNotificationsInbox因

Given Data : Sample Size, n = 100.0 Sample Mean, x̄ = 86000.0 standard…

Answered: 1. A random sample of 100 households in…

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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In a survey, 28 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $30 and standard deviation of $3. Find the margin of error at a 98% confidence level. Give your answer to two decimal places. ch daurfT d.bLoA
Solve the following. Show your complete solution. The in-city gasoline mileage per gallon was computed for two economy automobiles, each for 40 tanks of gasoline. The mean and standard deviation of the mile per gallon readings were given in the following table. Find a 90% confidence interval for the difference in mean miles per gallon for the two automobiles. Interpret your result.
Title a. A random sample of 25 was drawn from a normal distribution with a standard deviation of 5. The... Description a. A random sample of 25 was drawn from a normal distribution with a standard deviation of 5. The sample mean is 80. Determine the 95% confidence interval estimate of the population mean. b. Repeat part (a) with a sample size of 100. c. Repeat part (a) with a sample size of 400. d. Describe what happens to the confidence interval estimate when the sample size increases.
Read and answer the following questions. Write your answers on a sheet of paper. 1. The mean and standard deviation of n measurements randomly sampled from a normally distributed population are 33 and 4, respectively. Construct a 95% confidence interval for the population mean for each given n. b. n-15 C. n 20 a. were
can you find two tailed test p value for given data sample size 14 test statistics -2.23
A. You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. If convenient, use technology to construct the confidence intervals. A random sample of 40 home theater systems has a mean price of $127.00. Assume the population standard deviation is $19.30. Construct a 90% confidence interval for the population mean. The 90% confidence interval is B. A study of lobster trap placement used a 95% confidence interval to estimate the mean trap spacing (in meters) for the population of red spiny lobster fishermen fishing in the west coast. How many teams of fisherman would need to be sampled in order to reduce the width of the confidence interval to 6 meters? Assume prior knowledge indicates that the trap spacing readings for the population of red spiny lobster taken during a day are approximately…
We wish to construct a 90% confidence interval for the population mean weight of newborn elephant calves. A sample of forty-nine weights of newborn elephants are collected. The sample mean is 254.148 pounds and a sample standard deviation of 13.265 pounds. a. Complete the following for the necessary statistics. i. How many places are your statistics rounded to? ? ✓ ii. Fill in the blank for the following statistics and s= iii. Which of the following statsitcs listed is the point estimate? v b. Verify the requirements for the confidence interval i. Which test should be used to verify the requirements? Select an answer ii. Has the requirements for the test met?? n = c. What is the sampling distribution Select an answer d. What are the two critical values? Round your answer to at least four decimal places right = e. What is the margin of error? Enter N/A if the margin of error does not exist. left = E= f. What is the confidence interval for the population parameter? Upper bound: g. State…
A. Find the sample meanB. Find the sample standard deviation C. Construct a 98% confidence interval for the population mean(please show what numbers you are putting into the formula for part b)
9 The standard error of the mean is, a 0.881 b 0.735 c 0.612 d 0.510
A fitness center is interested in finding a 95% confidence interval for the mean number of days per week that Americans who are members of a fitness club go to their fitness center. Records of 271 members were looked at and their mean number of visits per week was 2.3 and the standard deviation was 1.6. a. To compute the confidence interval use a ? distribution. b. With 95% confidence the population mean number of visits per week is between visits. and c. If many groups of 271 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population mean number of visits per week and about percent will not contain the true population mean number of visits per week.
1. Find the sample standard deviation from the following data. 1420,1223,988,694,730,836,721,742,541,623,1449,950 2., Construct a 99%confidence interval for the population mean μ.
A. You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. From a random sample of 40 business days, the mean closing price of a certain stock was $107.60.Assume the population standard deviation is $10.03. The 90% confidence interval is B. A study on the personality characteristics of drug dealers sampled 100 convicted drug dealers and scored them each on the Wanting Recognition (WR) Scale, which provides a quantitative measure of a person's need for approval and sensitivity to social situations. (Higher scores indicate a greater need for approval.) The sample of drug dealers had a mean WR score of 44, with a standard deviation of 6. Use this information to find an interval estimate of the mean WR score for all convicted drug dealers. Use a confidence level of 99%. Interpret the result.…

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