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We will randomly select 100 bags of cookies and weigh the contents of each bag selected. what the probability that the sample mean will be between 14.9 and 15.1 ounces is ?
Students whose test scores are in the upper 10% are eligible for scholarship opportunities for college. What is the test score that corresponds to the upper 10% cutoff point of the probability dist
What is the number of left handers in the sample and what notation is given to that number? What is the values of p and ^p?
CRA,CD's, Inc., wants the mean lenghts of the "cuts" on a CD to be 135 seconds (e minutes and 15 seconds). This will allow the disk jockeys to have plenty of time for commercials within each 10 minu
A committee of three is selected at random from five managers. what is the probability that the committee will contain at least two managers from accounts departments
"The life span of a battery is normally distributed, with a mean of 2500 hours and a standard deviation of 50 hours. What percent of batteries have a life span that is more than 2590 hours?"
Assume the cholesterol levels of adult American women are normally distributed with a mean of 190 mg/dL. What percent of adult women do you expect to have cholesterol levels at least 200 mg/dL?
If you want to be 99% sure that you have estimated average family food expenditures within $50, how many families do you need to survey?
If you play this game until you win something and then stop, what is the chance you play at least 3 times? How many plays would you expect?
A cabinet has 3 identical drawers. One drawer contains 2 gold coins, another drawer has a gold coin and a silver coin, and the third drawer has 2 silver coins. What is the chance you get a gold coin
A computer store has 75 printers of which 25 are laser printers and 50 are ink jet printers. If a group of 10 printers is chosen at random from the store, find the mean and variance of the number of
As a marketing gimmick, the factory guarantees that no two jars have exactly the same number of red, orange, yellow, green, blue, and violet jelly beans. What is the maximum number of jars the facto
Assume that the wait time at the bank follows a uniformly probability distribution in the interval 4-8 min. Find the probability that a randomly selected individual has to wait at least five minute
International Trucking last year sold 20% of their trucks in the Far East, 40% in Europe, 30 in Canada, and 6 in the United State. At level of significance 0.05, test whether the distribution of sal
Calculate the 95% and 99% CIs for the proportion of all female Hispanic drivers in Boston who wear seatbelts. Why is the 99% CI wider than the 95% CI?
Patients with children Conduct a hypothesis test using the P-Value method. What conclusions would you make when a=o.2 and a=0.02
A medical company receives a large shipment of vitamins and tests 15 tablets from each shipment. The entire shipment is accepted if only one or non of the tablets is defective. If the defect rate is
Using the results of the pilot study and a 95% confidence, what size sample would be required to estimate the proportion of unemployed college students if we want the margin of error not to exceed 5
A Tech school accepts only those applicants who graduate in the top 10% of their school class. The Average GPA is known to be 2.67 with standard deviation = 0.58. What GPA will a student need to hav
If the shop does not want to give more than 1% of its customers a free lube and oil change service, how long should the guarantee be? Round appropriately to the minute.
A video store needs to keep enough recorders in inventory to meet customer demand. But keeping inventories to meet all demand is costly. The manager estimates that 90% of consumer demand for videos
The mean time for the completion of a shopping center is estimated to be 14 months with standard deviation = 4 months. What is the probability that the renters will not be able to move in 19 months?
Can we conclude that if she repeats the same investment twice, the mean value of her net gain/loss will again be $2000? What if she repeats the experiment 10 times?
What is the expected number of baby girls in the sample of 40 births? What is the standard deviation of this binomial distribution?
Construct a frequency distribution of the sample mean, and plot a histogram of this distribution. Use the central limit theorem to calculate and identify the sampling distribution of the sample mean