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In a region, 80% of the population have brown eyes. If the 10 people are randomly selected, find the probability that at least 8 of them have brown eyes. Is it unusual to randomly select 10 people a
You are going to toss a coin repeatedly in successive trials until you get a head for the first time, and then you are going to stop the experiment. Assuming that the coin is unbalanced with P(head)
A directory of personal computer retail outlets in the United States contains 12,080 alphabetized entries. Explain how systematic sampling could be used to select a sample of 300 outlets.
Serum ferritin is used in diagnosing iron deficiency. In a study conducted recently researchers discovered that in a sample of 28 elderly men the sample standard deviation of serum ferritin was 52.6
Suppose we want a 90% confidence interval for the average amount of time (in minutes) spent per week on homework by the students in a large introductory statistics course at a large university.
A researcher would like to determine if relaxation training will affect the number of headaches for chronic headache sufferers. For a week prior to training, each participant records the number of h
A bag contains 8 red, 3 white, and 9 blue marbles. If 3 marbles are drawn at random without replacement, calculate the probability that a) all 3 are red; b) all 3 are white; c) at least 1 is white;
If the sample has n=25 scores, then calculate the estimate standard error and determine whether the sample is sufficient to conclude that the treatment has a significant effect? Use a two-tailed te
If there are 10 different screws in a box that are needed in a specific order for assembling a certain product, what is the probability of picking them in the correct order?
A smooth talking student has a 1/3 probability of talking a policeman out of giving him a speeding ticket. The probability that he is stopped for speeding during a given weekend is 1/2.
What decision should be made by the optimistic decision maker? What decision should be made by the pessimistic decision maker?
(1) a 25% raise to $2,500 per month; (2) a base salary of $1,000 plus $600 per house sold; or, (3) a straight commission of $1,000 per house sold. Over the past year, Jim has sold up to 6 homes in a
A box contains six tickets, labeled with the numbers 1, 4, 8, 15, 15, 15. The normal approximation to the chance that the sum of 50 draws with replacement from this box is no larger than 592 is ____
Analyze the data from this experiment (Minitab and JMP can analyze data from factorial designs). Are the basic analysis of variance assumptions satisfied in this experiment?
It is unlikely that the GPA values for college students who study 3 hours per day are normally distributed. In fact, it is likely that the GPA distribution is highly skewed. If so, what impact, if a
What is the standard error of a sampling distribution when ? (sigma) = 24 and n = 144?
Steve and his friends are relaxing at a local tavern. The number of drinks that Steve's table receives is Poisson distributed with an average of 9 drinks per 3 hours. Write out the distribution and
Lily estimates that her time to fall asleep each night is approximately exponentially distributed. It takes her an average of 30 minutes to fall asleep.
Find the mean and standard deviation of the resulting distribution of sample means for n = 121.
Chocolate-coated Sugar Fun Blast cereal is filled in boxes by weight. The weight of the boxes is approximately normally distributed with a mean of 16 ounces and a standard deviation of 0.2 ounces.
Using a standard deck of 52 cards, explain why the situation of drawing a 7 and a club is not collectively exhaustive.
What are the null and alternative hyptheses if we want to test to see if the satisfaction rating for the sundae are significantly lower than the satisfaction rating for the pastry.
An engineer is going to redesign an ejection seat for an airplane. The seat for an airplane. The seat was designed for pilots weighing between 130 lb and 171 lb. The new population of pilots has nor
Which of the following are categorical (or qualitative) variables in these records? Select all correct answers.
State the null and alternative hypotheses for the following conjecture: A researcher thinks that if expectant mothers use vitamine pills, the birth weight of the babies will increase. The average bi