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In Dallas, 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 and had 20 accidents, while the fleet of yellow fire trucks made 135,035 runs and had 4 accidents. At α = .01, did the yellow fire trucks have a significantly lower accident rate?
(a) State the hypotheses.
(b) State the decision rule and sketch it.
(c) Find the sample proportions and z test statistic.
(d) Make a decision.
a) What statistical test should be used to analyze these data? b) Identify H0 and Ha for this study. c) Conduct the appropriate analysis d) Should H0 be rejected? What should the researcher conclude?
The ________ is the probability of observing a sample value as extreme as, or more extreme than the value observed, given that the null hypothesis is true.
Students from the class for an oral exam, what is the probability that 3 female students and 5 male students will be selected?
What method has been used to transform Model 1 to Model 2? Equations for Model 1 and Model 2 are as follows:
Develop a linear regression model for these data and forecast carpet sales if 30 construction permits for new homes are filed.
Forecast sales for the next day using a three-day weighted moving average where the weights are 3, 1, and 1 (the highest weight is for the most recent number).
Pollsters attempt to find out whether or not person is a "likely voter" before they count their opinion in poll. If we suppose 40% of registered voters will really vote.
Identity Probability Distributions. In this exercise, determine whether a probability distribution is given. In the case where a probability distribution is not described
Determine whether or not the average age of the evening students is significantly different from 21. Use a 0.1 level of significance.
Using a 5% level of significance, is there any difference in proportion of guests who would select the two resorts? What is your conclusion?
The Financial Advisor exam has a mean of 500 and a standard deviation of 20. If the bank chooses to hire either Steve or Mark based solely on their exam performance, who is the bank more likely to hire? Show evidence for your answer.
Calculate a 92% confidence interval for the mean density of quartz porphyry, given that 75 samples yield mean of 2.62 grams per cubic centimeter
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