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Suppose that 16 percent of the students in a certain high school are freshmen, 14 percent are sophomores, 38 percent are juniors, and 32 percent are seniors. If 15 students are selected at random from the school, what is the probability that at least 8 will be either freshmen or sophomores?
Draw a tree diagram to show all possible outcomes of the experiment. Label the probability associated with each stage of the experiment on the appropriate branch.
Assume that the distribution of birth weights is Normal with a standard deviation of 50 pounds. Find the birth weight of elephants at the 95th percentile.
The null hypothesis is that the mean math scores for boys and girls in fifth grade are the same. Conduct a hypothesis test.
In the United States, sudden infant death syndrome (SIDS) is one of the leading causes of postneonatal deaths (those occurring between the ages of 28 days and 1 year).
Perform the appropriate test of hypothesis to determine whether Kim's average time has changed. Use alpha=.01. Compute the power of the test if Kim's actual mean swimming time is 147.3 seconds. Interpret the results.
the daily demand for six-packs of coke at mr. ds follows a normal distribution with a mean of 120 and a standard
You have to pay $5 tothe host if your choice is not correct. Let the random variable x be the money you get or lose. Complete the probability distribution.
Assuming that the standard deviation and the normal shape are unchanged, to what level must the mean reduce so that 20 gallons per week is the third quartile rather than the mean?
during the 3pm to 5pm time period cars arrive at a banks drive through window at an average rate of 15 customers per
Point out your final decision concerning hypothesis test and compute p-value for test.
A new restaurant with 123 seats is being planned. Studies show that 57% of the customers demand a smoke free area. How many seats sould be in the non-smoking area in order to be very sure (mean+3StandardDeviation) of having enough seating there?
If 40 of this kind of question are selected at random and checked, find the probability that 4,5 or 6 questions will be answered incorrectly.
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