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A sample of 120 homes sold recently in a big city gave the mean price of homes equal to $270,000 and the standard deviation equal to $70,000.
a) What is the point estimate of the mean price of all homes in the big city?
b) Construct a 99% confidence interval for the mean price of all homes in the big city.
c) Explain the advantage of the confidence interval over the point estimate.
According to Central Limit Theorem, how big of sample is essential to be sure sampling distribution of sample means is normally distributed.
Which of the following is NOT true regarding the normal probability distribution.
The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, and 10.
Suppose that sales of lemonade and sales of brownies are independent, determine standard deviation in his revenue.
Gestational Age (Gestage, weeks) for sample of 100 low birth weight infants, and output from fitting a simple linear regression model to data, regressing Headcirc (Y) on Gestage (X).
Assume that x has a normal distribution, with the specified mean and standard deviation. Find the indicated probabilities.
Find the probability that he will answer all 10 questions correctly.
Give the Z score for person who scores (a) 340, (b) 310, and (c) 260. Give the raw scores for persons whose Z score on this test are (d) 2.4, (e) 1.5, (f) o, and (g) -4.5
What statistical procedure was used to analyze data in study B?
Find out the expected winnings for a person who buys one ticket.
Find a 95% confidence interval for the proportion p of the inner-city, working-class group who eventually became alcoholics.
Use given data to create the unbiased point estimate of 12σ'> 2 of percentage of termites that are minor workers.
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