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The Paralyzed Veterans of America is a philanthropic organization that relies on contributions. They send free mailing labels and greeting cards to potential donors on their list and ask for a voluntary contribution. To test a new campaign, they recently sent letters to a random sample of 100,000 potential donors and received 4781 donations.
a) Give a 95% confidence interval for the true proportion of those from their entire mailing list who may donate.
b) A staff member thinks that the true rate is 5%. Given the confidence interval you found, do you find that percentage plausible?
In this forum post provide your results also elucidate what they mean in context of your favorite channel. To find 95 percent confidence interval for given data.
raw materials are studied for contamination. suppose that the number of particles of contamination per pound of
How many degrees of freedom must researcher use in her t-test critical value supposing that variances are equal?
Draw the histogram for these data using an initial class boundary of and a class width. Note that you can add or remove classes from the figure. Label each class with its endpoints.
in a truefalse quiz there are two possible answers to each of 5 questions. a student has not studied for the quiz and
in an experiment to assess the strength of the hunger drive in rats 30 previously trained animals were deprived of food
You want to know whether the population means are different in the two populations. Conduct an hypothesis test using an alpha of .05 and the critical value method.
When it comes to advertising, "'tweens" are not ready for the hard line messages that advertisers often use to reach teenagers. The Geppeto Group study found that 78% of 'tweens understand and enjoy ads that are silly in nature.
Given the times (minutes) in file XR14040, and using the 0.05 level of significance, can it be concluded that the slopes could be equally difficult? Identify and interpret the p-value for the test.
A researcher would like to determine whether an over-the-counter cold medication has an effect on mental alertness. A sample of n = 16 participants is obtained and each person
Many people believe that criminals who plead guilty tend to get lighter sentences than those who are convicted in trials. The accompanying table summarizes randomly selected sample data for San Francisco defendants in burglary cases. All of the su..
determine the x2 percentile that is required to construct each of the following cisa confidence level 95 degrees of
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