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A randomly selected group of 400 workers are questioned about their beer drinking preferences. a) if a blue-collar worker is chosen at random from this group, what is the probability that he or she
Assume the population proportion for this candidate is 0.5. (a) Show the sampling distribution of p. What is the probability that the poll will provide a sample distribution within 0.02 of the populat
A throws six dice and wins if he scores at least one ace. B throws twelve dice and wins if he scores at least two aces. Who has the greater probability to win?
Find the probability that a randomly selected adult has an IQ between 90 and 100. Assume that the mean of scores is 100 and a standard deviation of 15.
Write the simple linear regression equation for the least square regression line that shows the relationship between weight of cars and gas consumption.
A survey of 865 voters in New York State reveals that 408 favor approval of an issue before the legislature. Construct the 95% confidence interval for the true proportion of all voters in the state
The probability that a bomber hits target on any particular mission is 0.80 . Four bombers are sent after the same . What is the probability :
Prepare a 750-1,050-word paper describing the process of using a statistical test to answer this research question. Be sure to include the following in your paper: a. Formulate a set of verbal hypot
One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations and variances of X and Y.
let X, Y be 2 bernoulli RVs with respective parameters p,q. They are not necessarily independent. Let @ denote P(X=1, Y=1) a) what is the joint PMF f(XY)(x,y)?
Suppose a bag contains 7 red chips, 8 black chips, and 3 green chips. You draw two chips (without replacement) from the bag. Find the probability that you drew a red chip ?rst and then a black chip
Sunshine Stereo sells cd players. The cd players life is normally distributed with a mean of 2.5 years and a standard deviation of 0.4 years. What is the z score for a cd player will break down duri
How can a non-linear relationship among two variables influence the correlation coefficient? For example, ability to pay attention and the level of stimulation in the environment do not demonstrate
A government agency has specialists who analyze the frequencies of letters of the alphabet in an attempt to decipher intercepted messages. In standard English text, a particular letter is used at a
"A student takes a 6 question multiple choice quiz with 4 choices for each question. If the student guesses at random on each question, what is the probability that the student gets exactly 4 quest
Find the expected value or average profit per customer and determine how much profit they should expect if 10 people purchase one of their European vacation packages.
researcher interested in estimating average salary of teachers. 95% confidence. Standard deviation $1050, how large a sample is needed to be accurate within $200 .
What type of sampling was this study? What is your analysis of this approach? What are the advantages and disadvantages of this approach?
Conduct a test for checking that the proportions of women and men that liked commercial A are the same versus the two-sided alternative at the 5% level.
a shipment of 10 tv sts includes three defective tv sets.in how many ways can a hotel purchase four of these sets and receives at least two of the defective sets.
A reliable revenue stream for cities is parking meters. what are the lower and upper bounds of the confidence interval?
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
x is a random variable that represents ph of arterial plasma, the mean of the x distribution is 7.4. a random sample of 33 patients with arthritis took the drug for 3 months blood test showed an ave
stating that i have improved when i actually had not would be a type 1 or type 11 error? what is the p value associated with this test? would i reject the null hypothesis?
A researcher wants to determine if the number of minutes spent online per day is independent of gender. A random sample of 315 adults was selected and the results are shown below. Find the critical