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According to a survey conducted at the local DMV, 49% of drivers who drive to work stated that they regularly exceed the posted speed limit on their way to work. Suppose that this result is true for the population of drivers who drive to work. A random sample of 13 drivers who drive to work is selected. Use the binomial probabilities table (Table I of Appendix B) or technology to find to 3 decimal places the probability that the number of drivers in this sample of 13 who regularly exceed the posted speed limit on their way to work is
a. at most 4
Probability =
b. 6 to 9
c. at least 6
Clyde's Chairs and Things sells custom made chairs. Yearly sales from 1983 to 2011 are provided below. After analyzing the information, answer the following questions as completely as possible:
Identify the population and sample of interest to the researchers.- Describe the variables measured in the study as quantitative or qualitative.
the lifetime of zzz batteries is normally distributed with a mean of 270 hours and a standard deviation of 10 hours.
a clinical trial tests a method designed to increase the probability of conceiving a girl. in the study 290 babies were
Find the margin of error for sample sizes of 5 to 100 by increments of 5-that is, let n = 5, 10, 15,..., 100. Plot the margins of error versus the sample sizes and summarize the relationship.
The DPMO for process is 860. Find the approximate Six Sigma level of the process?
The standard hemoglobin reading for normal males of adult age is 15 g/100 ml. The standard deviation is about 2.5 g/100 ml. For a group of 36 male con- struction workers, the sample mean was 16 g/100 ml. Construct a 95% confidence interval fo..
what is the f ratio? why is the computation of the f ratio based on mean squares instead of sums of
Bob compares his SAT Verbal score of 400 to Marge's ACT Verbal score of 20. "I beat you," he exclaims. "My score is 20 times your score!" Although his multiplication is good, his logic is faulty. Explain why.
the mean and the standard deviation of the sample of 100 bank customer waiting times in table 1.8 are xbar5.49 and
Q1.The life of cell batteries is normally distributed with a mean of 88.2 hours and a standard deviation of 15.5 hours. 93% of the batteries will last more than how many hours? (2 decimal places )
Determine the mean, median, and standard deviation. Determine the first and third quartiles. Develop a box plot. Are there any outliers? Organize the distribution of funds into a frequency distribution.
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