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What is the critical F value for a sample of 7 observations in the numerator and 6 in the denominator? Use a two-tailed test and the 0.10 significance level.
Heights of men on a baseball team have a bell shaped distribution with a mean of 184 cm and a standard deviation of 5 cm . Using the empirical rule, what is the approximate percentage of men between
Daily demand for newspapers for the last 10 days has been as follows: 12, 13, 16, 15, 12, 18, 14, 12, 13, 15. Forecast sales for the next day (Day 11) using a three-day weighted moving average where
According to the empirical rule, if the data form a "bell-shaped" normal distribution, what percent of the observations will be contained within 3 standard deviations around the arithmetic mean.
A correlation is computed for a sample of n = 18 pairs of X and Y values. What correlations are statistically significant with ? = .05, two tails. 1. correlations greater than or equal to 0.456 and
The probability of a roulette ball landing on black is approximately 47.4%. Find the probability that the ball lands on black at least 8 times in 15 spins.
A suburban specialty restaurant has developed a single drive-thru window. Customers order, pay, and pick up their food at the same window. Arrivals follow a Poisson distribution while service times
Let X1, X2, X3, and X4 be four mutually stochastically independent random variables with the same pdf f(x) = 2x, 0<x<1, zero elsewhere.. Find the mean and variance of the sum Y of these four r
For more accurate calculations, the insurance company wants to estimate the life expectancy to within 1 year (margin of error) with 95% confidence. How many randomly selected records would they need
How can you use probability to improve your chances of winning at a casino. Provides specific examples using concept leaned this semester.
The weight of an ice-cream shop's sundae special is known to be normally distributed with a mean of 0.5 pounds and a standard deviation of 0.1 pounds.
A researcher is interested in investigating if phosphate supplementation results in significant increase in growth rate of dogs. Answers must be correct up to three decimal places.
Should t-procedures or z-procedures be used in this setting? Why? Construct a 90% confidence interval for the true mean value of a box of cards.
A luxury housing developer is evaluating several local lakes they hope to develop a housing community at the lake that has the most abundant source of fish for potential tenants The developer found
Suppose Mary scores 82 on a test, while her class had a mean of 72 and a standard deviation of 5.
Paris Arline's wants to estimate the average number of flights pet year for its crews. A quick pilot study found the mean to be 150 flights, with a standard deviation of 14.
If the die is rolled 25 times, what is the probability that an odd number occurs exactly 14 times? b) What is the expected value of a single roll of the die?
Test at the 1% level of significance whether this data supports the contention that the true average yield for this kind of wheat is less than 2.0 tons per acre.
In 1990, the mean ph. level of rain in town was 4.61. A biologist fears the ph. level has recently increased. She draws a sample of 13 rain dates and obtains this data:
The probability that an American CEO can transact business in a foreign language is 20%. Ten American CEO s are chosen at random. WHat is the probability that at least two, but no more than five can
Determine the critical values. Will the researcher reject the null hypothesis? Explain why for the classical method
The bailey agency is studying long distance calls made from there office. They find that the length of calls follows a normal distribution, with a mean of 4.2 minutes and a standard deviation of 0.
In a 2010 survey, 58% of Generation Y (GenY) adults were found to pay their monthly bills on time. Suppose a member of GenY is randomly selected. What is the probability that this individual pays mo
A new extended lightbulb has an average service life of 750 hours. With a standard deviation of 50 hours. If the service life of these bulbs approximates a normal distributions, about which percent