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In an ABCNews.com nationwide poll done in 2001, the proportion of respondents who thought that it should be illegal to use a hand held cell phone while driving a car was 69 %. The poll's sample was 1027.
A) Find the value of the standard error of the sample proportion.
B) Find a 90% confidence interval estimate of the population proportion that thinks it should be illegal to use a cell phone while driving.
The sample mean and the standard deviation were determined to be 120 and 40 respectively. The standard error of the mean is?
Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern.
Determine the probability that we would reject null hypothesis given that it is true?
Given the following data on the number of pints of ice cream sod at a local ice cream store for a 6 period time frame.
Of the 900 employees, 590 had college degrees, 120 were single, and 80 were single college graduates. Find the probability that an employee of the company is married and has a college degree.
If computing a causal linear regression model of y = a + bX and the resultant r2 is very near zero, then one would be able to conclude that:
At the end of 24 weeks of treatment, subjects were classified as responders or non-responders to treatment based on a battery of psychological tests.
There a flu epidemic that is spreading across SF County. You are a principle and are in charge of 32 teachers. You want to plan ahead and be able to estimate how many substitute teachers the school may need during this epidemic.
A data source generates hexadecimal characters. Let X be the integer value corresponding to a hex character. Suppose that the four binary digits in the character are independent and each is equally likely to be 0 or 1.
Using the data in the Excel file Home Market Value, develop a multiple linear regression model for estimating the market value as a function of both the age and size of the house.
Suppose that you are interested in determining the relation between the students average SAT scores [x] and their freshman GPA [y].
The time a cashier spends processing individual customer's order are independent random variables with mean 2.5 minute and standard deviation of 2.
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