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Acording to the National Association of Realtors , 44% of U.S. homes sold in March 2010 wre purchased by first time home buyers. A random sample of 170 people who just purchased homes is selected.
a) Calculate the standard error of the proportion and
b) What is the probability that between 66 & 72 of them are first-time buyers?
Considering the following data using weighted moving average (4 quarters; 0.4, 0.3, 0.2, and 0.1; where 0.5 is the weight for the most recent quarter)Calculate Mean Absolute Deviation.
A psychologist is examining the influence of an older sibling in the development of social skills. A sample of 24 three year old children is obtained.
experiments have shown that when a clean tungsten surface is heated by laser irradiation using a focused ruby laser the
You are conducting an evaluation of services at a social service agency. One of the evaluation issues is finding out whether male clients rate the quality of casework services as highly as do female clients.
the owner of brittens egg farm wants to estimate the mean number of eggs laid per chicken. a sample of 20 chickens
suppose a production facility purchases a particular component part in large lots from a supplier. the production
Let Z be a standard normal random variable. Use the calculator provided to determine the value of c such that P(-c lesser than or equal to Z lesser than or equal to c)= 0.9534
On average, a National Express coach arrives every two hours. What is the probability that only one bus will arrive in a four hour period?
Normal adult Mean Temperature is 98.2 and standard deviant is 0.62 with normal distribution. If 16 people are randomly selected determine the probability that their mean body temp is below 98.5 degrees.
A half-liter bottle of soft drink is supposed to contain a mean of 520 ml. The filling process follows a normal distribution with a known process standard deviation of 4 ml.
Describe a business situation where you would want to use a t-test. Why would you choose that test? What would you expect to show by doing this?
the average hourly wage of workers at a car wash is 6.50hr. assume the wages are normally distributed with a
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