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for a sample with n=36, the mean duration of a geyser is 3.55 minutes and the standard deviation is 0.63 mintues. Using chebychev's theory, determine at how many of the eruptions lasted between 2.29
Suppose that a simple random sample is used to estimate the proportion of families in a certain area that are living below the poverty level. If this proportion is roughly 0.15, what sample size is
The Oil Price Information Center reports the mean price per gallon of regular gasoline is $3.26 with a population standard deviation of $.18. What is the standard error of the mean in this experiment
A company produces packets of soap powder labeled "Giant Size 32 Ounces." The actual weight of soap powder in a box has a normal distribution with a mean of 33 oz. and a standard deviation of 0.8 oz
Gear tire Company has produced a new tire with an estimated mean lifetime mileage of 36,500 miles. Management also believes that the standard deviation is 5000 miles and that tire mileage is normall
Obtain the estimated regression function. Plot the estimated regression function and the data. Does a linear regression function appear to give a good fit here?
The two intervals (114.4, 115.6) and (114.1, 115.9) are confidence intervals for μ = true average resonance frequency (in hertz) for all tennis rackets of a certain type. What is the value of the
Cash withdrawals (in multiples of $20) at an on-campus ATM for a random sample of 30 Fridays and 30 Mondays are shown following. At α = .01, is there a difference in the mean ATM withdrawal on
International Communications Research (ICR) conducted the 2004 National Spring Cleaning Survey for the Soap and Detergent Association. ICR questioned 1000 American male and female head of household
These questions concern how to collect a random sample of 800 airline passengers from 100 particular flights. Describe how to draw the sample as a stratified random sample, using the 100 flights as th
What is the age distribution of adult shoplifters (21 years of age or older) in supermarkets? The following is based on information taken from the National Retail Federation.
What is the maximum rate of return that you would pay to borrow the $200 need to take advantage of the high yield investment?
The average salary for graduates entering the actuarial field is $40000. If the salaries are normally distributed with a standard deviation of $5000, find the probability that a) an individual gradu
The probability of a radar station detecting an enemy plane is 0.75. If 6 stations are in use, what is the standard deviation? Round your answer to nearest hundredth.
Examine the required sample size needed to be able to estimate the mean dollars that each card holder will spend each month. I
The braking distances of a Honda CRV can be approximated by a normal distribution, where the mean is 53 meters and the standard deviation is 3.8 meters. Let x be a random variable that represents a
What is the probability that a shopper will spend more than 25 minutes in a store? If 200 shoppers enter a store, how many shoppers would you expect to stay in the store for more than 25 minutes?
It was revealed that 120 people had only 1 admission, 81 had 2 admissions, 48 had 3 admissions, 18 had 4 admissions, 18 had 5 admissions, and 15 had 6 admissions or more admissions. Does the data s
A random sample of 64 bulbs indicates the mean is 350 hours. At the .05 is there evidence that the mean life is different than 375 hours?
In 2005 the maximum temperature on February 1 was 35 in Boston and 10 in Dublin. Need to explain which one of theses 2 temperatures was more extreme relative to past experience on that date.
Ophelia Obrien, VP of American First Bank (AFB) monitors the default rate on personal loans at the AFB member Banks. One of her standars is "no more than 5% of personal loans should be in default. O
A key measure of customer satisfaction is the response on a scale from 1 to 10 to the question: "Considering all the business you do with Bank of America, what is your overall satisfaction with Bank
How does Discreminant analysis work for a multivariate normal distribution with the variance-covariance matrix computed in each group is the same?
According to a survey reported in the Business Week, 30% of adults in the U.S. said that the cell phone is the invention that they hate most but cannot live without. If a random sample of 6 adults i
What type of test is described below and can you provide the null and alternate hypothesis? Using an old manufacturing process.