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A company manufactures batteries for watches. A random sample of 169 batteries is taken and the sample mean life is 5.5 years with a standard deviation of 0.6 years. If you were constructing a 99% two-sided confidence interval estimate, the lower limit would be?
We are interested in testing to see if the variance of a population is less than 7. The correct null hypothesis is:
A coin was flipped twenty times and landed heads fifteen times. Based upon this information, answer the following the question:
The standard deviation of the ages of a sample of 21 executives from the northern states was 8.4 years; while the standard deviation of the ages of a sample of 30 executives from southern states was 12.8 years.
Although this critique was later discarded, how does user error affect the marketplace. When I buy my morning coffee at Starbucks, the cup warns me: "Careful, the beverage you are about to enjoy is extremely hot."
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
Develop a trend line for the demand for fertilizer using computer software. Data collected on the yearly demand for 50 pound bags of fertilizer at Wallace Garden Supply are shown in the following table:
A national survey of restaurant employees found that 75% said work stress had a negative impact on their personal lives. A sample of 100 employees from a popular restaurant chain finds that 68 answer
A nursing professional conducts an analysis to examine scores on the mental health service and treatment outcome questionnaire.
A manager at a local manufacturing company has been monitoring the output of one of the machines used to manufacture small aluminum plates.
Assume gasoline prices for a region are normally distributed. Do the data you obtained provide enough evidence to reject the claim? Use a 1% level of signi?cance.
Use Chebyshev's theorem to determine what percent of values will fall between 58 and 82 for data set with mean of 70 and standard deviation of 4.
Please give an example on higher wages vs. education level using a sample population of 30 men and women. Compute the measures of central tendency, dispersion, and skew for your data
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