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Suppose X~N(4,3^2). Using the standard normal table find the probabilities. 1) P(-2.5 less than or equal to X which is less than or equal to 2.5) 2) P( X which is greater than or equal to 5) 3) P (
Now, suppose that the company currently has 180 units in stock, and it will not be receiving any further shipments from its supplier for at least 3 weeks. What is the probability that the company wi
An investment company pays 6% compounded semiannually. You want to have $12,000 in the future.
At issue is the proportion of people in a particular county who do not have health care insurance coverage. A simple random sample of 240 people was asked if they have insurance coverage, and 66 rep
Students who have completed a speed reading course have reading speeds that are normally distributed with a mean of 950 words per minute and a standard deviation equal to 220 words per minute. If tw
If the store takes a random sample of 100 shoppers exiting the store, what is the standard deviation of the sample-mean purchase? What is the probability that the sample-mean purchase will exceed $5
A pizza house is considering offering the following special: "Pizza delivered in less than 30 minutes or the pizza is free." Based on a random sample of 40 delivery times
Find the approximate probabilities that S is less than or equal to 5, 7, 9, and 11 and compare these to the exact probabilities.
Let Z be a standard normal random variable. Use the calculator provided to determine the value of c such that
Give five potential problems/issues with linear regression and methods for investigating and addressing them. Please be detailed.
What is the probability of a strike settlement given that you know the union's strike fund to be adequate to support a strike? Is the settlement of a strike within a two-week period dependent on whe
At the .01 level of significance, is there sufficient evidence to conclude that a difference exists between the mean number of volunteer hours per week for male and female college students?
Given that 30% of a community is Hispanic, when randomly selecting a jury of 12 persons, what are the following probabilities? (Hint: a binomial distribution).
A researcher wishes to know, with 98% confidence, the percentage of women who wear shoes that are too small for their feet. A previous study conducted by the Academy of Orthopedic Surgeons found tha
The personnel department of a large corporation wants to estimate the family dental expenses of its employees to determine the feasibility of providing a dental insurance plan. A random sample of 12
The average length of life of a brand of light bulb is 2000 hours with a population standard deviation of 120. A sample of 100 light bulbs is to be taken. What is the probability of the sample mean
A population has a mean of 2200 and a standard deviation of of 400. Taking a random sample of size 100 from this population, the standard error of the mean would equal
Christine has always been weak in mathematics. Based on her performance prior to the final exam in Calculus, there is a 43% chance that she will fail the course if she does not have a tutor. With a
Based on the sample's results, what is the best point estimate of average annual coffee consumption for Danish coffee drinkers? Develop and interpret a 90% confidence interval estimate for the mean an
The time required to assemble an electronic component is normally distributed with a mean and standard deviation of 16 minutes and 8 minutes, respectively.
An urn contains 4 red and 6 blue balls. Suppose that 8 balls are selected at random and with replacement. What is the probability that the first 6 are red and the rest are blue?
In a tire factor, the quality control inspector examines a randomly chosen sample of 16 tires. When more than one defective tire is found, production is halted, the existing tires are recycled, and
In a survey of undergraduate library usage, it was found that 76% of seniors, 59% of juniors, 50% of sophomores, and 28% of freshmen use the library frequently. Suppose that 17% of the undergraduate
The same test is used in another country, and it is found that 25% of a sample population tests positive. If we assume this sample is representative, what fraction of the population has the disease?
Urn A has 12 white and 16 red balls. Urn B has 3 white and 8 red balls. We flip a fair coin. If the oucome is heads, then a ball from urn A is selected, whereas if the oucome is tails, then a ball