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The mean number of bacteria colonies of a certain type in samples of polluted water is 2 per cubic centimeter (cm3).
(a) If four 1-cm3 samples are independently selected from this water, find the probability at least one sample will contain one or more bacteria colonies.
(b) How many 1-cm3 samples should be selected in order to have a probability of approximately .95 of seeing at least one bacteria colony in at least one of the 1-cm3 samples?
(c) If four 1-cm3 samples are independently selected from this water, find the probability at least two samples will contain one or more bacteria colonies.
A random sample of 61 accounts were checked. The standard deviation was $286.20. At α= 0.01, test the firms' assumption. Assume the account balances are normally distributed.
The results are shown below. Research question: Are the mean waiting times the same for emergency patients in these four hospitals? Use 0.05 for the significance level in making your decision.
Indicate which would be the independent variable and which would be the dependent variable in each of the following:
a c chart is to be used to control soldering imperfections on a certain mass-produced circuit board. after 250 circuit
Does the weight of a vehicle affect the gas mileage? The following random sample was collected where x = weight of a vehicle in hundreds of pounds and y = miles per gallon.
Braking distances of cars. A random sample of 13 four-cylinder cars is obtained and braking distances are measured and found to have a mean of 137.5 ft. and a standard deviation of 5.8 ft.
In how many ways can at least one of the 3 selected vials have a hairline crack if the order of selection does not matter?
What are the 5 steps involved in hypothesis testing using the traditional/classical method; Can you use a simple real world example to explain it.
Kannon Camera has developed a new camera that it claims can take an average of more than 10 photographs per second. You decide to evaluate the company's claim.
Choose a product you are familiar with as a consumer. Answer the following. What type of demand patterns would that product have - cyclical, secular, seasonal, etc. or a combination of several types? Explain.
A large electronics company wants to estimate the proportion of all households that own GPS machines. What sample size is required that would give the maximum error of 2.0% for a 95% confidence interval? An unscientific survey had a result of 30%.
Given the following data on Asian and European Share of U.S. Light Truck Sales(1990-2003): Which trend model is best, and why? If none is satisfactory, explain.
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