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Consider a normal population with u=42 and standard deviation= 5.4. Calculate the z-score for an x bar of 49 from a sample of size 23. (Give your answer correct to two decimal places.)
What is the probability that a randomly chosen 10-card hand has exactly three three-of-a-kinds (and no four-of-a-kinds)?
Americans have become increasingly concerned about the rising cost of Medicare. In 1990, the average annual Medicare spending per enrollee was $3267; in 2003, the average annual Medicare spending pe
What is the probability that the time to detect the next pieces of debris is between 2.5 and 4.5 minutes? What is the median time to detection of debris?
If the average number of textbooks in a professor's offices is 16, the standard deviation is 5 and the average age of professors if 43, with a standard deviation of 8, which data set is more variabl
Consider the following. (Give your answers correct to two decimal places.) Determine the value of the confidence coefficient z(?/2) for 1 - ? = 0.83. Determine the value of the confidence coefficient
The distribution of the monthly costs does not follow the normal distribution. In fact, it is positively skewed. What is the probability of selecting a sample of 55 c to be at least $1,985 per month
The distribution of the monthly costs does not follow the normal distribution. In fact, it is positively skewed. What is the probability of selecting a sample of 55 one-bedroom apartments and findin
In order to accumulate enough money for a down payment on a house, a couple deposits $415 per month into an account paying 3% compounded monthly. If payments are made at the end of each period how m
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