The U.S. Department of Transportation, National Highway Traffic Safety Administration, reported that 77% of all fatally injured automobile drivers were intoxicated. A random sample of 54 records of automobile driver fatalities in a certain county showed that 34 involved an intoxicated driver. Do these data indicate that the population proportion of driver fatalities related to alcohol is less than 77% in Kit Carson County? Use ? = 0.01. (a) What is the level of significance? State the null and alternate hypotheses. (b) What sampling distribution will you use? What is the value of the sample test statistic? (c) Find the P-value of the test statistic. Sketch the sampling distribution and show the area corresponding to the P-value. (d) Based on your answers in parts (a) to (c), will you reject or fail to reject the null hypothesis? Are the data statistically significant at level ?? (e) Interpret your conclusion in the context of the application.

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A: Given, A recent survey showed that from a sample of 500 packages delivered by a Postal Service, 480…

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A: n₁= 317 x₁= 69 n₂= 296 x₂= 15 α = 0.05

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A:

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A: Given, The sample proportion is,

Q: summarized below in thousands. 1992: mean = 13,126; stdev = 675.3; n = 20 2012: mean = 14,197;…

A: The pooled standard deviation can be calculated as:

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A: a.   Denote p1, p2 as the true population proportions of people over the age 55 and under the age 25…

Q: Professors collected data consisting of eye color and gender of statistics students. Among 950 male​…

A: Given that, For males:  X1= 372 and sample size n1= 950  p1^ = X1/n1 = 372/950 =0.3916 For females:…

Q: Past studies have indicated that the percentage of smokers was estimated to be about 33%. Given the…

A: Answer: From the given data, Population proportion (P) = 33% = 0.33 Sample size (n) = 1875 x = 436…

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Q: 8. Is there a doctor in the house? The Bureau of Labor Statistics reported that in May 2009, the…

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Q: The accompanying data set includes volumes (ounces) of a sample of cans of regular Coke. The summary…

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A:

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Q: The Congressional Budget Office reports that 36% of federal civilian employees have a bachelor's…

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A: Dear student as per guidelines we answer the first three subparts only. Please post other subparts…

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Q: o dream in black and white is greater than the proportion for those under 25. Complete parts (a)…

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A:

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.