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Suppose you estimate the mean length of all popular songs to be 182 seconds. Then, you use a random sample of 40 songs from your iPod to construct a confidence interval. The confidence interval you construct is (182.2, 226.2). What can you conclude about your estimate based on this interval?
(1 point) According to data from the Tobacco Institute Testing Laboratory, a certain brand of cigarette contains an average of 1.4 milligrams of nicotine. An advocacy group questions this figure, and commissions an independent test to see if the the ..
What is the correlation between pre-test scores and post-test scores? Assuming the obvious directional hypothesis (i.e., that those who score highly at pre-test tend to score highly at post-test), is the correlation statistically significant?
The police play a key role in the juvenile justice system because they are, typically, the point of first contact. Their decisions often affect the youth throughout the entire juvenile justice process. For example, depending on the nature of the offe..
A company claims the average time a customer waits on hold is less than 5 min. A sample of 35 customers has an average wait time of 4.78 min. Assume the population standard deviation for wait time is 1.8 min. Test the company claim at the α = 0.05 si..
When two variables are correlated, it means that they are associated with one another. But if they are associated with one another, then why doesn't one cause the other?
Heights of swedish men follow a normal distribution with mean 72 in and standard deviation of 5 in. How high must a doorway be so that 90% of swedish men can go through without having to bend?
Identify sample, population, sampling frame (if applicable), and response rate (if applicable). Describe sampling technique (if applicable) or experimental design
A small retail store sells a particular brand of monochrome and color television sets. Each monochrome set that is sold earns a profit of $100, while each color set earns $200 profit. The manager of the store estimates that the weekly demands for eac..
In a manufacturing process a random sample of 16 bolts manufactured has a mean length of 8 inches with a standard deviation of 1.6 inches. What is the 99% confidence interval for the true mean length of the bolt
Computer output from a multiple regression model with three independent variables yields the following estimated regression equation: 20.9 + 1.4X1 + 4.2X2 - 0.7X3.
1.if your data is a random sample of size n from the distribution N(4, 7), then what is the distribution of the statistic X(not Z or T)? Z?T?
Burger Q sells about 500 DoubleHappinness burgers daily. It is their trademarked star seller that is a double burger. As their customers are rather unpredictable, they need to carry extra 750 burgers. Burger Q buys the patties from John’s Farm, who c..
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