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A survey of 100 dog owners showed that the average dog 'checked the mail' eleven times during an evening walk. Which question most probably represents the purpose of the study?
Supposed that from a population of 50 banks accounts, we want take a random sample of four account in order to learn about the population, how many different random samples of four accounts are possible?
Probabilities are based on equally likely outcomes, a long-run set of observed outcomes, or subjective assessment
How do you calculate the quarter 1 in an interquartile range given a set of data?
A lottery game contains 29 balls numbered 1 through 29. What is the probability of choosing a ball numbered 30?
Far separated sample means + differences of sample means are large compared to their internal (within) variability! Which of the following examples indicate group diff"s are "large"?
To determine the proportion of people in your town who are smokers, it has been decided to poll people at one of the following local spots
A research team wants to know if aspirin helps to thin blood. The null hypothesis says that it doesn't. They test 12 patients, observe the proportion.
A manufacturer claims that the mean lifetime,M , of its light bulbs is 51 months. The standard deviation of these lifetimes is 9 months. Ninety bulbs are selected at random, and their mean lifetime is found to be 53 months.
The class to get A's, 30% to bet B's, 30% to get C's, 15% to get D's and 10% F's. What would be the minimum and maximum scores required for each of these grades?
Find the equation of the regression line for predicting the number of miles per gallon (mpg) on the highway from the number of miles per gallon in the city.
Convert these data to relative frequency distributions, one for the total United States, the other for the western states. Do the results appear to suggest any differences between total U.S. prices and those in the western states?
the average selling price of blackberry smart phones purchased by a random sample of 35 customers in 2010 was 311.
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