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Question: Pollution. A company with a fleet of 150 cars found that the emissions systems of 7 out of the 22 they tested failed to meet pollution control guidelines. Is this strong evidence that more than 20% of the fleet might be out of compliance? Test an appropriate hypothesis and state your conclusion. Be sure the appropriate assumptions and conditions are satisfied before you proceed.
The following table shows the hardness (in Brinell hardness numbers) and the tensile strength (in thousands of pounds per square inch) of ten specimens of a certain alloy.
Does the Southside qualify for the employment assistance program and provide the city council with a recommended course of action based on this result.
a candy maker produces mints that have label weight of 20 grams on each box. assume that the weight of a box of mints
If the standard deviation is $10,000, can the cable manager conclude that there is a difference? Test at alpha = 0.10.
Conduct the test at the 0.05 level of significance whether the modification actually increased the life of the AAA battery. What was their decision rule?
Make a stemplot of the data and briefly describe its center, shape and spread
Describe the relationship between the Housing Cost Index and the Median Family Income by state.- If we standardized both variables, what would the correlation coefficient between the standardized variables be?
a random sample of 16 emergency reports was selected from the files of an ambulance service. the mean time computed
What is statistical power? How does a researcher decide whether to use a one-tailed or two-tailed test? What are the advantages and disadvantages of using a two-tailed test?
A program was developed to improve nutrition among low-income residents in New York City. This program was evaluated by comparing NYC residents who were randomly assigned to the intervention group vs. residents assigned to the control group. The..
a medical devices company wants to know the number of hours their mri machines are used per day. a previous study found
Calculate (rounded to the nearest tenth) The correlation between IQ and Anxiety r =??
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