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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
A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages.
You have administered a standardized test of manual dexterity to two groups of 10 semi skilled workers. One of these two groups of workers will be employed
The lifetime of a certain brand of battery is known to have a standard deviation of 19.8 hours. Suppose that a random sample of 50 such batteries
Find the value of za/2 that corresponds to a confidence level of 97.80%.
A researcher wishes to determine whether people with high blood pressure can reduce their blood pressure by following a particular diet
In evaluating the effectiveness of the state rehabilitation program, a survey of 49 prisoners (from several thousand prisoners in prison)
Explain why it would not be reasonable to use estimation after a hypothesis test for which the decision was "fail to reject Ho.
Biting an unpopped kernel of popcorn hurts! As an experiment, a self-confessed connoisseur of cheap popcorn carefully counted 773 kernels
The union for a particular industry has determined that the standard deviation of the daily wages Find a 90% confidence interval for the true mean daily wage