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Thirty (30 ) students were asked if they voted for Hilary Clinton or John Nosh for president. Eighteen (18) said that they voted for Hilary and twelve (12) said they voted for John Nosh.
a) Using the proportions obtained for Clinton and Nosh, determine the sample size required to be 99% confident that the error is within 2 percentage points.
Sample size n = _______
b) If we have no information about the proportion of votes that either candidate received, determine the sample size necessary to be 95% confident that the error will be within 4 percentage points.
An applicant needs a minimum combined score of 1400 to gain admission and what percentage of applicants have combined GRE scores between 1200
Uniformly distributed in the interval -0.5 cents to 0.5 cents. What is the probability that the round-off error exceeds 0.3 cents or is less than -0.3 cents?
Using the experiment as a "pilot study", determine how many rats you should have in each group for a non-directional test. (The mean NE in the control group in example 7.9 is 444.2 ng/g and the SD is 69.6 ng/g.)
There is a program for STD/HIV/pregnancy education/prevention called Postponing Sexual Involvement (PSI) run in Atlanta. Evaluation data collected at the end of ninth grade as a follow-up to the program compared two group of adolescents
a normal distruibution of 640 observations has a mean of 1800 cm and a standard deviation of 90 cm.a draw a
to estimate the average age of a breast cancer patient a random sample of 17 patients were selected from a large
The true proportion of all current B of A customers who would respond with a 9 or 10. Are we 95 % confident that this proportion exceeds .48 the historical proportion of customer delight for B of A?
Identify the indicated values or interpret the given display. In a survey of 703 randomly selected workers,
Using the .05 level, do the results support the researcher's theory? (a) Use the steps of hypothesis testing, (b) sketch the distributions involved.
two out of five adult smokers aquired the habit by age 14. if 400 smokers are randomly selescted find the probability
the traditional view about the normal curve in psychology is that normal curves are 6a rare in nature but often occur
Suppose an engineer proposes a new model that will weigh 3100 pounds. What could we expect the miles per gallon in the city performance would be?
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