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You are a travel agent and wish to estimate, with 95% confidence, the proportion of vacationers who plan to travel outside the United States in the next 12
As a condition of employment, Fashion Industries applicants must pass a drug test. Of the last 220 applicants 14 failed the test
An election poll reported that a candidate had an approval rating of 30% with a margin of error E of 4%. Construct a confidence interval for the proportion
In a random sample of six microwave ovens, the mean repair cost was $90.00 and the standard deviation was $11.00. Assume the variable is normally distributed
Find the indicated probability or percentage for the normally distributed variable.
An experimental egg farm is raising chickens to produce low cholesterol eggs. A lab tested 16 randomly selected egg
The new Twinkle bulb is being developed to last more than 1000 hours. A random sample of 100 of these new bulbs is selected from the production line.
Find the level of confidence assigned to an interval estimate of the mean formed using the interval: x - 1.96·sx to x + 1.96·s x .
Measure minutes to and from work versus the time of day I leave. The objective is to find the time of the day that takes the least amount of time
A poll is planned to determine what proportion of all students favor an increase in fees to support a new track and field stadium.
Families USA, a monthly magazine that discusses issues related to health and health costs, surveyed 20 of its subscribers
A survey of a random sample of 250 car commuters indicates that 80 would switch to commuting by public transport if they had to pay at least $10 per week
The UNITE/MORI 2004 survey of student experiences estimated that university students in the UK paid on average $54 per week in accommodation costs.
In each of the following exercises, a set of condition is given. To construct a 95 percent confidence interval for the population mean
A machine produces 9 inch latex gloves. A sample of 85 gloves is selected, and it is found that 36 are shorter than they should be
Use the given degree of confidence and sample data to find a confidence interval for the population standard deviation o.
A nursing school wants to estimate the true mean annual income of its alumni. It randomly samples 200 of its alumi
In the next presidential election of year 2012, five candidates running for the election are Sarah Palin, Hilary Clinton, Barack Obama, Mitt Romney
In a random sample of 100 manufacturing firms, 67 indicated that their company attained ISO certification within the last two years
Suppose you have drawn a simple random sample of 225 students from OSU. In this sample, 45 students own Blackberries. Let p denote the proportion of OSU student
Suppose you are sampling from a population with mean µ = 1,065 and standard deviation σ = 500. The sample size is n = 100. What are the expected value
Create and interpret the confidence intervals- 90%, 95%, and 99%..
A simple random sample of 8 employees is selected from a large firm. For the 8 employees, the number of days each was absent during the past month was found
A human resource manager for Carver County is evaluating a recent effort to improve the health of the county's firefighters by providing an exercise
A test was conducted to compare the wearing quality of the tires produced by two tire companies. A random sample of 16 cars is equipped with one tire