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Suppose that, as reported by the Centers for Disease Control, about 30% of high school students smoke tobacco. You randomly select 120 high school students to survey them on their attitudes toward scenes of smoking in the movies.
a) What's the expected number of smokers?
b) What's the standard deviation of the number of smokers?
c) The number of smokers among 120 randomly selected students will vary from group to group. Explain why that number can be described with a Normal model.
d) Using the 68 - 95 - 99.7 Rule, create and interpret a model for the number of smokers among your group of 120 students.
A particle starts at the origin of the real line and moves along the line in jumps of one unit. For each jump the probability is p that the particle will jump one unit to the left and the probability is 1-p that the particle will jump one unit to ..
a large number of people are waiting in line at espresso royale as it often happens at around noon. the barista
Use Chebyshev’s Inequality to solve this problem. Show your work. A machine used to fill cereal boxes dispenses on average µ ounces per box. The manufacturer wants the actual amount dispensed, Y , to be within 1 ounce of µ at least %93 of the time. W..
Why must researchers ensure that their experimental groups are roughly equivalent before manipulating the independent variable?
Let Y(sub-1) be the sales during month t (in thousands of dollars) for a photograph studio, and let P(sub-t) be the price charged for the portraits during month t. The data are included in the file provided below.Use regression to fit the followin..
Find the cumulative distribution function.- Find the probability that at most four additional hours are slept.- Find the probability that at least two additional hours are slept per night.
Suppose that there are 40 students in a statistics class and their blood type follows the percentage distribution given in Exercise. (a) If we randomly select two students from this class, what is the probability that both will have the same..
What is the probability that two randomly selected foreign-born people in the United States in 1997 were both naturalized citizens?
Consider a balanced four by three factorial. Show that orthogonal contrasts in row means (ignoring factor B) are also orthogonal contrasts for all twelve treatments when the contrast coefficients have been repeated across rows (ij = i).
Create raw score predictions on criterion variable for persons with Z scores on predictor value of -2,-1,0,+1,+2.
Select a question of your own to investigate using one of the hypothesis tests studied in this class. Explain why you chose the particular question to investigate. State a provable claim (corresponding to the alternative hypothesis). Write the n..
Joe dealt 20 cards from a standard 52-card deck, and the number of red cards exceeded the number of black cards by 8. He reshuffled the cards and dealt 30 cards. This time, the number of red cards exceeded the number of black cards by 10. Dete..
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