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The diameter of a 3.5 inch diskette is normally distributed. Periodically, quality control inspectors at dallas diskettes randomly select a sample of 16 diskettes. If the mean diameter of the disket
According to the U. S. Center for Health Statistics the probability that a randomly selected twenty year old will live to age 65 is 80%. A club has twenty members aged twenty. What are the chances t
Five different cold remedies were tested on samples of 6 people each. Use ANOVA to test if the average time before relief is the same for all five remedies. Use Alpha=0.05.
Only 10% of American adults can name the capital of the Czech Republic. On a television game show the three randomly selected contestants are given the question "What is the capital of the Czech Rep
The following table gives the possible net gains (in dollars) of a gambling game and the corresponding probabilities
Suppose a simple random sample of size 57 is selected from a population with = 11. Find the value of the standard error of the mean in each of the following cases (use the finite population correcti
There are two fuses in an electrical device. Let X denote the life time of the first fuse and Y denote the life time of the second fuse. Find the probability that both fuses last at least 3 years.
A man buys twenty $1 lottery tickets per week. The chance of buying a winning ticket is 5%. what is the average number of winning tickets that he buys per week ?
A lottery has a first prize of $5000, two secondprizes of $1000 each, and two $100 third prizes. A total of10,000 tickets is sold, at $1 each. Find the expected winnings of a person buying 1 ticket.
Find the mean and standard deviation for the batting average for a player in the most recently completed MBL season. What batting average would separate the top 5% of all hitters from the rest?
A coin is tossed 5 times and x is the number of times a tail shows up. The following table gives the probability distribution of x.
A sample of 100 high school students revealed that the mean time spent working at an outside job each week is 10.7 hours with a standard deviation of 11.6 hours. what is the 99% confidence level for
At the 10% significance level, test if the two teams differ with respect to their proportions of unacceptable assemblies. what is the p value.
Six percent (6%) of all shoppers make an impulse purchase at the check-out counter in a grocery store. If a store has 650 customers each day, what is the average number of impulse purchases made per
The statistician wishes to estimate the mean height of the trees in the forest preserve, and has calculated an appropriate sample size of n=43 trees. The 587th of the 731 trees in the preserve was s
The sample standard deviation was 8.2 hours. what is the 95% confidence interval for the mean number of hours worked per week for the population of u.s men?
Twelve percent (12%) of the population write with their left hands. Six students enter a classroom that has one left-handed desk free. What is the probability that exactly one of the six students wr
The Johns Hopkins Regional Talent Searches gives the Scholastic Aptitude Test (intended for high school juniors and seniors) to 13-year-olds. Determine if the male scores are significantly higher tha
A supermarket has determined that daily demand for eggs has a bell-shaped distribution, with a mean of 55 cartons and a standard deviation of six cartons. If the supermarket begins each morning with
The Information Commons in the main library has 150 personal computers. The probability that any one of them will require repair on a given day is 0.02. To find the probability that exactly 25 of th
A standard deviation that is clearly lower than the standard deviation of 0.062 g from the old equipment? based on the results, does the new equipment appears to be effective in reducing the variati
Ten experts rated a newly developed chocolate chip cookie on a scale of 1 to 50. Their ratings were: 34, 35, 41, 28, 26, 29, 32, 36, 38 and 40. What is the mean deviation?
Construct a 95% confidence interval estimate for the difference between the means of two normally distributed populations, where the unknown population variances are assumed not to be equal. Summary
Customers arrive at an automated coffee vending machine at a rate of 4 per minute. What is the average number in the system?