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It has been found that 62.1% of all unsolicited third class mail delivered to households goes unread. Over the course of a month a household recieves 100 pieces of unsolicited mail. What is the mean of the sample proportion of pieces of unread mail? What is the standard error of the sample proportion?
To evaluate average annual expenses of students on books and class materials sample size 36 is taken.
A committee of three is selected at random from a set consisting of five Democrats, eight Republicans, and two Independents.
The mean of a normal distribution is 400 pounds. The standard deviation is 10 pounds. a) what is the area between 415 pounds and the mean of 400 pounds?
You are the production manager of a company. Parachutes are woven in your factory using a synthetic fiber purchased from one of four different suppliers. The most important outcome for parachutes is strength of the fabric.
What is the appropriate set of hypotheses to test such that a possible outcome of the test would indicate;
A commuter travels many miles to work each morning. She has timed this trip 5 times throughout the last month. The time (in minutes) required to make this trip was 44, 39, 41, 35, and 41.
Find the percentage of the 1000 enemy that will be destroyed.
Using an investment game, the study demonstrated that people who inhaled oxytocin were more likely to give their money to a trustee compared to people who inhaled an inactive placebo. For this experimental study, identify the independent variable ..
Pretend you are in charge of a packaging equipment company that is filling boxes of cereal. From past experience we know the population's mean weight of the filled boxes is 300 grams (and we know the distribution of grams is approximately normal).
How many participants would be required to ensure that a 95% confidence interval for the mean difference in the number of drinks is within two drinks of the true mean? Assumed that the standard deviation of the difference in the mean number of dri..
A sample of 60 smokers has a mean cotinine level of 125. Assuming that sigma=25, find the 90% confidence level estimate of the mean cotinine level of all smokers.
Test this conjecture with formal hypothesis test, by using a 5% significance level. Find out the p-value for hypothesis test.
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