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The Highway Safety Department wants to study the driving habits of individuals. A sample of 121 cars traveling on the highway revealed an average speed of 60 miles per hour with a standard deviation of 11 miles per hour. Determine a 95% confidence interval estimate for the speed of all cars.
Conduct a marketing experiment in which students are to taste one of two different brands of soft drink
In a sample of 88 children selected randomly from one town, it is found that 8 of them suffer from asthma. Find the P value for a test of the claim that the proportion of all children in the town who suffer from asthma is equal to 11%.
Determine the probability that their SAT scores will differ by more than 50 points?
Complete the table and answer the following questions. Use the .05 significance level.
Is there evidence that the population mean is above $300, if X (bar) = $305.11 and s = $43.20?
In a 1993 survey of 560 college students, 171 said that they used illegal drugs during the previous year. In a recent survey of 720 college students, 263 said that they used illegal drugs during previous year.
the probability density function of the length of a metal rod is fx 2 for 2.3 lt xgtlt 2.8gta if the specifications for
Would the resulting sets of data represent dependent or independent samples? Why? What could the students change in the project to have it represent the other?
How large a sample is needed if the principal would like to assert with 90% confidence that the sample mean is off by, at most, 7 minutes. Assume σ = 14 minutes.
The national average SAT score (for Verbal and Math) is 1028. Suppose that nothing is known about the shape of the distribution and that the standard deviation is 100. If a random sample of 200 scores were selected and the sample mean were calcula..
Which of the following is not true about the student's t distribution? It has more area in the tails and less in the center than does the normal distribution.
How large a sample is required to estimate the mean speed with a margin of error equal to 2 miles per hour with 90% confidence?
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