In a national wide survey a researcher expects 30 percent of

Assignment Help Basic Statistics
Reference no: EM13241085

In a national wide survey a researcher expects 30 percent of the population will agree with an value statement. He wishes to have less than 2% error and 95% confident. What sample size is needed?

Reference no: EM13241085

Questions Cloud

A machine produces 3 inch nails. a sample of 100 nails is : A machine produces 3 inch nails. A sample of 100 nails is selected, and it is found that 25 are shorter than 3 inches. Find the 95% confidence interval on the proportion of all such nails that are shorter than 3 inches.
What sample size is necessary : Survey to determine what proportion of new car buyers continue to have their car serviced at the dealership after warranty ends. Estimates 30% of customer do so.
Pre-industrial or emerging countries : From your own readings, study, and personal experience, contrast the living conditions of people living in post-industrial countries (e.g., the United States) with those in pre-industrial or emerging countries.
A researcher expects the population proportion of the cubs : A researcher expects the population proportion of the Cubs Fans in Chicago to be 80%. Error of less than 5% confident of an estimate to be made from a mail survey. What is the sample size required?
In a national wide survey a researcher expects 30 percent of : In a national wide survey a researcher expects 30 percent of the population will agree with an value statement. He wishes to have less than 2% error and 95% confident. What sample size is needed?
Calculate a confidence level at 95% to get an interval : Calculate a confidence level at 95% to get an interval estimate for proportion?
How did the weaknesses of the roman economy : How did the weaknesses of the Roman economy in the Western Empire affect the Empire, and in what way did these weaknesses lead to the fall of Rome?
Suppose you are planning a sample of employees to determine : Suppose you are planning a sample of employees to determine the monthly average # of vacation days. Standards set: Confidence level of 99% and an error of less than 5 units. Standard deviation be 6 units. What would be the required sample size?
Choose a variable and collect data for at least three : Choose a variable and collect data for at least three different groups (samples). Compare the means of the three groups using the one-way ANOVA technique. Complete the following

Reviews

Write a Review

Basic Statistics Questions & Answers

  Test claim that at airport mean wait for takeoff is less

With a standard deviation of 9.87 minutes. At the 0.05 level of significance, test the claim that at this airport the mean wait for takeoff is less than the mean wait for baggage.

  Probablity that first claim under warranty is tenth car sold

Rrequired service under the warranty. consider a new dealer. what is the probablity that the first claim under this warranty is the tenth car sold?

  Including the number of retial outlets in the region stockin

Suppose that the sales manager of a large automotive parts distributor wants to estimate as early as April the total annual sales of a region. On the basis of regional sales, the total sales for the company can also be estimated.

  Computing the mean for the given data

Determine the mean number of times the machine was used per day.

  Find probability that in hundred births girls are more

If the probability of a newborn child being female is 0.5, find the probability that in 100 births, 55 or more will be female. Use the normal distribution to approximate the binomial distribution.

  Reject if z is lower critical value-upper critical value

Using = .05, what is the critical value for the test statistic? (+ or -). State the rejection rule: Reject H0 if z is the lower critical value or the upper critical value.

  Find the probability that at least one of them has disease

The proportion of the American population that has disease Z is p=0.02. If 60 people are randomly selected from the population, what is the probability that at least 1 of them has disease Z?

  How large sample check to confident the true proportion

How large a sample should she check in order to be 93 percent confident that the true proportion is estimated to within 0.014?

  Results of a regression analysis

A bank official reported the results of a regression analysis designed to predict the bank's charges (y), measured in dollars per month, for services rendered to local companies.

  Hypothesis testing-e-commerce website

The cost of an e-commerce website can vary a great deal. A market research team hypothesized that the cost of an average website is $3500.

  Research and statistics-t-test

A hypothesis states a difference exists between two populations. Sometimes this is an obvious conclusion because the means will be very different.

  Test the claim of the mean speed of all cars

What would be the correct null and alternative hypothesis for the following situation: The sample has a mean of 72.3 mph and a standard deviation of 7.4 mph. Use a 0.05 significance level to test the claim that the mean speed of all cars is greate..

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd