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What is a hypothesis test? Why do we need to use them to make decisions about relating sample results to the population; why can't we just make our decisions by the sample value?
Random samples of populations (in thousands) of U.S. cities in three sections of the country are listed. Is there evidence to conclude a difference in means at the 0.001 level of significance?
The new study is going to use the confidence level of 90%. The estimator or appreciative must be in 1% of the population proportion. Which is the necessary size of the sample?
An education task force looking at poverty levels in the United States has collected data for each state and the District of Columbia on the total number of people below the poverty level and the number of adults over the age of 25 who did not g..
a sample of 40 los angeles pharmacies sells the tamiflu 75mg prescription drug for about 137 for a moth supply s 30.2
Standard deviation of 8 hours. what percentage of the bulbs have lifetimes that lie within 1 standard deviation to either side of the mean?
locate the results of a recent survey in a newspaper magazine or internet article. outline the survey data so that your
suppose it has been observed that touchdowns scored in a game by your favorite football team are poisson random
The mean SAT verbal score is 412, with a standard deviation of 90. Use the Empirical Rule to determine what percent of the scores lie between 412 and 592. (Assume the data set has a bell-shaped distribution.)
Identify at your place of work (or a previous place of work, or an organization with which you are affiliated). Identify a dependent variable and 3 independent variables
the computer-science aptitude score x and the achievement score y measured by a comprehensive final were measured for
Mr. price Home analyzed the value of purchase made on credit by a sample of 25 credit card customers. The simple mean was found to be R170.08 with a sample standard deviation of R21.90. Assume purchase values are normally distributed.
The normal distribution has several characteristics that make it the underlying foundation of much of inferential statistical tools.
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