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What is a 95% confidence interval on our estimate of mean if our sample of 40 observations (with a sample standard deviation of 1.6) produces a sample mean of 161.3?
An auditor knows from past history that the average accounts receivable for a company is 519.75 dollars with a standard deviation of 601.05 dollars. If the auditor takes a simple random sample of 93
A random sample of 90 printers discovered that 25 of them were being used in small businesses . Find the 95% limit for the population proportion of printers that are used in small businesses.
A electrical device consists of 4 identical components arranged so that the device functions if and only if all four components are working. Find the mean lifetime of this device?
The population standard deviation is 30 sat points. what is the probability that a random sample of 36 students will have a mean verbal sat score that is great than 535?
Applicants with exam scores in the lower 10% are directed to special retraining. What is the minimum score required not to be directed to retraining?
A life insurance company has determined taht each week an average of seven claims is filed in its Nashville branch. What is the probability that during the next week exactly seven claims will be fil
Make a table with x-column money to win/lose (+/-) and probability lumn P(x)that this happens, then calculate Expected Value of x E(x) for this distribution.
Assuming that the distribution of the times is normal, what is the probability that the average for this sample is between 30 and 40 minutes.
quarters have weights that are normally distributed with a mean of 5.670 and a standard deviation of 0.062 g. A vending machine is configured to accept only those quarters with weights between 5.550
If the top 5% of coffee drinkers are considered heavy coffee drinkers, what is the minimum number of cups consumed by a heavy coffee drinker?
Using the Binomal Probability Formula. assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of x success
Twenty randomly selected families were selected and the average monies spent on summer vcations recorded. what is the probability that the mean money spent is greater than $700.
Suppose that the highway gas mileage rates for both of these cars are uniformly distributed over a range from 20 to 30 mpg. What proportion of these cars would fall into the 22 to 27 mpg range? Comp
What proportion of children 10-15 years of age would be classified as hyperlipidemic (Assume that hyperlipidemia is defined as a total cholesterol level over 200)?
Compute the projected profit for the rder quantities suggested by the management team under three scenarios: worst case in which sales = 10,000 units, most likely case in which sales = 20,000 units
In a particular company 43% of the employees make over $70,000 per year.If a random audit selects the pay records of 62 employees what is the mean and standard deviation for the expected number of e
The average miles were the tire failed were recorded. What is the probability that the mean miles recorded when the tires failed will be more than 59,500 miles?
The number of lightening strikes on a square kilometer of open ground in a year has mean 6 and standard deviation 2.4. The National Lightening Detection Network uses automatic sensors to watch for l
Conduct a hypothesis test of to see whether the 2001 sample data indicate that the variability in interest rates has changed. Use . What is your conclusion?
Based on the information above, estimate the mean and standard deviation of the weight of the pain killer in each bottle.
What is the probability that the proportion of 400 freshmen that return to the same school for their sophomore year is less than 0.67?
It has been hypothesized that on average employees spend one hour a day playing video games at work. To test this at her company, a manager takes a random sample of 35 employees who showed a mean ti
The annual per person consumption of Ice Cream is normally distributed with a mean of 16.5 lbs. and a standard deviation of 2.5 pounds. (U.S. Dept. of Agriculture) A. Find the probability that a ran
At the .05 level of significance, is there evidence to suggest that the mean life length of the batteries produced by this manufacturer is more than 400 hours?