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One suggested method for solving the electric-power shortage in a region involves constructing floating nuclear power plants a few miles offshore in the ocean. Concern about the possibility of a ship collision with the floating (but anchored) plant has raised the need for an estimate of the density of ship traffic in the area. The number of ships passing within 10 miles of the proposed power-plant location per day, recorded for n = 60 days during July and August, possessed a sample mean and variance of Y = 7.2 and s2 = 8.8.
a. Find a 95% confidence interval for the mean number of ships passing within 10 miles of the proposed power-plant location during a 1-day time period.
b. The density of ship traffic was expected to decrease during the winter months. A sample of n = 90 daily recordings of ship sightings for December, January, and February yielded a mean and variance of Y = 4.7 and s2 = 4.9. Find a 90% confidence interval for the difference in mean density of ship traffic between the summer and winter months.
c. What is the population associated with your estimate in part (b)? What could be wrong with the sampling procedure for parts (a) and (b)?
a sample of 51 observations has a mean of 98 and a standard deviation of 7. a second sample of 69 observations has a
Assess the impact of an event on a population. I ran a survey before the event and then I ran the survey after the event. The collected responses matched between prior to the event and after. I used paired t-test to determine if the event had a posit..
What are the advantages of ANOVA over the mean test and what are the disadvantages? Where would I use this in my everyday life?
If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph, how large a sample size must be taken?
Suppose that combined verbal and math SAT scores follow a normal distribution with mean 896 and standard deviation 174. Suppose further that Peter finds out that he scored in the top 3% of SAT scores. Determine how high Peter's score must have bee..
a local school district claims that the number of school days missed by its teachers due to illness is below the
A behavioral research situation that could use a Pearson coefficient research study and a chi square research study. Present the rationale for each selection.
Assuming that Richard guesses on all eight questions, find the indicated probabilities. What is the probability that he will answer all questions correctly?
Scores on test form normal distribution with mean of µ = 150 and a standard deviation of σ = 25. Mean for sample is M = 158. Compute test statistics (z score) for sample.
1. the amounts a soft drink machine is designed to dispense for each drink are normally distributed with a mean of 11.6
you are rolling a pair of dice, one red and one green. what is the probability of the following outcomes. a.the sum of the two numbers you roll is 11 b. the sum of the two numbers you roll is 7 c. the sum of the two numbers you roll is 13
One of the ways to evaluate the ease of navigating a corporate website is to measure how long it takes to reach the link where you can view or download the company's most recent annual report.
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