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In a city study, some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 153,348 runs & had 20 accidents, while the fleet of yellow fire trucks made 135,035 runs & had 4 accidents. At ? = .01, did the yellow fire trucks have a significantly lower accident rate?
(a) State the hypotheses.
(b) State the decision rule & sketch it
(c) Find the sample proportions & z test statistic.
(d) Make a decision.
(e) Find the p-value & interpret it.
(f) If statistically significant, do you think the difference is large enough to be important?
(g) Is the normality assumption fulfilled?
If there is one-year warranty on the equipment, what proportion of the customers will actually make a valid warranty claim?
Explain the differences between longitudinal and cross sectional business research studies. Which two types of probability sampling are best suited for business research and statistical data analysis, and why?
The statistical analysis predicted that there would be 104 foxes. Calculate the residual for that data point.
Explain the difference between multiple independent variables and multiple levels of independent variables. Which is better?
Formulate an appropriate hypothesis test to examine at the 10% level of significance whether the manager's worries are justified.
How does the MHMR compare to the state's figures on providing services to first-time admissions - Hypothesis test for one sample mean
find the percentage of such males that weigh between 190 and 210 lb. (Note: Make sure you choose the flag value closest to 190 and 210.) Give the proportion as a decimal rounded to thousandths.
FBI Report Do greater universities tend to have more property crime, would you speek that the correlation is low, moderate or high
You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 95 percent confidence level and state that the estimated proportion must be within 2 percent of the population proportion.
They are thinking of introducing a new flavour, maple-marshmallow Frumpies, and want to know whether children will prefer the new flavour to the old one. Design a completely randomized experiment to investigate this question.
This is an Excel sheet that calculates both probabilities and percentiles for any normal or standard normal probability distribution. Replaces normal probability tables.
The Rathburn Manufacturing Company makes electric wiring, which it sells to contractors in the construction industry. Approximately 900 electric contractors purchase wire from Rathburn annually.
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