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A survey was conducted in Ohio on high school marijuana use. Of the 2266 high school students surveyed, 952 admitted to smoking marijuana at least once. A study done 10 years earlier estimated that 45% of the students had tried marijuana. We want to conduct a hypothesis test to see if the true proportion of high school students in Ohio who tried marijuana is now less than 45%. Use alpha = .01.
What is the standard error for this test?
let x denote the length in minutes of a long-distance telephone conversation. assume that the density for x is given by
what type of data would necessitate using a hypothesis test of the population proportion rather than a test of the
Eighty-eight shoppers were interviewed at random, and 59 said that they prefer to shop alone.
Scores on a test have a mean of 73 and Q3 is 81. The scores have a distribution that is approximately normal. Find P90.
Sample Mean Distribution and T-Interval
the following observations show the number of traffic violations given for speeding on the one interstate highway going
If 20 customers were selected at random during one business day, what is the probability that at least 11 of them did not order a pastry with their drink.
What have you learned about statistics?" In developing your responses, consider - at a minimum - and discuss the application of each of the course elements in analyzing and making decisions about data (counts and/or measurements).
Suppose that a random sample of fifteen recently sold houses in a certain city has a mean sales price of $290000 , with a standard deviation of $15,000.
Manufacturer of guitar amplifiers markets one of its models,
question an agricultural sprinkler distributes water in a circular pattern of radius 100 ft. it supplies water to a
If a null hypothesis is rejected at a significance level of .01, it will ______ be rejected at a significance level of .05
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