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The number of cell phone minutes used by high school seniors follows a normal distribution with a mean of 500 and a standard deviation of 50. What is the probability that a student uses 400 minutes
Give the manager a list of options within the budget and make a recommendation. Justify your answer. Note: don't just consider 95%.
The 70-year long-term record for weather shows that for New York State, the annual precipitation has a mean of 39.96 inches and a standard deviation of 4.56 inches. The annual precipitation amount h
In a library of 3000 songs, 50 are from a particular group. The library is shufled and played until the kth song from this group appears. Let Y denote the number of the song in the shufle where the
A repeated-measures study comparing two treatments with n = 4 participants produces MD = 2 and SS = 75 for the difference scores. What is the estimated standard error for the sample mean difference?
A simple random sample of 120 SAT scores has a mean of 1540. Assume that SAT scores have a population standard deviation of 300. Construct a 95% confidence interval estimate of the mean SAT score. (Sh
A researcher uses a repeated-measures design to compare individuals' performance before treatment with their performance after treatment. If all of the participants show improved performance of 8 o
Write a matlab program that can simulate picking skittles from a bag, 1 at a time without replacement. and shows the probability of picking a certain color from a bag of skittles(candy).
Suppose the average number of imperfections per sheet of this size is 3. What is the probability that a sheet of this size has no more than 2 imperfections?
A specific automotive part that a service station stocks in its inventory has an 8% chance of being defective. Suppose many cars come into the service station needing this part each week.
Find the area under the standard normal curve between z = -1.9 and z = 1.17, P(-1.9 < z < 1.17). (Give your answer correct to four decimal places.)
Below are the ages of people arrested on theft charges at a Mississippi county jail. For this sample, calculate the standard deviation:
Recently, a company tested three different machine types to see if there was a difference in the mean thickness of products produced by the three. A random sample of ten products was selected from t
What are the possible values of the number of defective betteries in the sample? What is the pribability the batch will be shipped?
What is the probability that the time until the first arrival exceeds 1.0 units of time? Determine the mean arrival rate such that the probability is 0.9 that there are no arrivals in 0.3 time units.
Poisson Distribution: In studying a rare disease, researchers notice that there is a 1 in 1000 chance of a person contracting the disease in a given year. If the researchers study a population of 10
A random sample of elementary school children in new york state is to be selected to estimate the proportion p who has received a medical examination during the past year.
Scores on a certain intelligence test for children between ages 13 and 15 years are approximately normally distributed with ?=106 and ?=27.
Almost all medical schools in the United States require applicants to take the Medical College Admission Test (MCAT). On one exam, the scores of all applicants on the biological sciences part of the
A researcher is studying test anxiety using a standardized instrument that has a mean of 50 and a standard deviation of 10. The researcher collects a sample of 25 students from a statistics class to
A national magazine claims that the average college student watches less TV than the general public. The national average is 29.4 hours per week, with a standard deviation of 2 hours.
The distribution of heights of adult men in the U.S. is approximately normal with mean 69 inches and standard deviation 2.5 inches.
Find the probability of throwing a sum of 11 at least 3 times in 11 throws of a pair of fair dice.
Suppose IQ scores were obtained from randomly selected siblings. For 20 such pairs of people, the linear correlation coefficient is 0.913 and the equation of the regression line is ybar = -15.61 + 1.