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The mean score on the math section of the SAT test is 508 and the standard deviation is 111. If a student has a z-score of 1.19, what was her score on the test?
A pair of dice is rolled. Find the probability of rolling
Find the linear correlation coefficiet between cumulative GPA and high school percentile for the 200 UWEC undergraduate students in the Focus sample.
A questionnaire sent through the mail as part of a market research study consists of eight questions, each of which can be answered in three different ways. In how many different ways can a person
In a certain population, 1% of the individuals are infected with a certain virus. A test is applied to the whole population and
A six-sided dice is tossed once and its outcome is noted. It is then tossed repeatedly until an outcome is observed that is at least as large as that on the first toss. Compute the expected number o
The market price for a certain product is $5 per unit and occurs when 14,000 units are produced. At at price of $1, no units are manufactured and at a price of $19.00, no units will be purchased. F
Suppose an unfair coin comes up heads 36.8% of the time if it is flipped. If the coin is flipped 11 times what is the probability that it comes up heads exactly 4 times? It comes up tails more than
If it is desired to have a reliability rate of 90 percent, what is its design life in days (assuming it follows a constant failure rate)?
The time to failure of flourescent lights in a large office building is exponentially distributed with a failure rate of 0.03125 hr. How many spare tubes must the building custodian maintain to hav
The following bootstrap output is for mileage of a random sample of 25 mustang cars.
Find the SEL predictor of y based on x. (You need to evaluate all of y opt(1), y opt(2), and y opt(3)) Evaluate the risk of this predictor.
A similar random sample of 125 assemblies from team 2 shows 8 unacceptable assemblies. Is there sufficient evidence to conclude, at the 10% significance level, that the two teams differ with respect
Use example posted in this week Lectures section to estimate Population Proportion. Sample proportion is ps = 0.48, sample size 125, zc = 1.96 (90% confidence level).
Suppose you want to sample the music of a band you haven't heard before. You're given 5 CDs, each with 12 tracks. You'll use a probability method to sample 5 tracks to play. Describe (briefly) how y
Please answer Which statistical test would be appropriate then carry out the test and evaluate the outcome at the .05 level and a nondirectional prediction.
Serum ferritin is used in diagnosing iron deficiency. In a study conducted recently researchers discovered that in a sample of 28 elderly men the sample standard deviation of serum ferritin was 52.6
Each participant's attendance is recorded for one quarter and the mean attendance days per group are calculated. Identify the independent and dependent variable and the population and sample.
Four machines were compared with respect to the mean length of a common product that they produce. Random samples of 5 units each were selected from the machines' production lines. When the test fo
Compute the probability mass function (pmf) of X, the number of corrupted files. Draw a graph of its cumulative distribution function (cdf).
An East Coast manufacturer of printed circuit boards exposes all finished boards to an online automated verification test. During one period, 900 boards were completed and 890 passed the test. The t
Two random variables X and Y have the joint distribution, P(0, 0) = 0.2, P(0, 2) = 0.3, P(1, 1) = 0.1, P(2, 0) = 0.3, P (2, 2) = 0.1, and P(x, y) = 0 for all other pairs (x, y).
Two dice are tossed. Let X be the smaller number of points. Let Y be the larger number of points. If both dice show the same number, say, z points, then X = Y = z. Find the joint probability mass fu
In order to estimate the reliability of a particular system, an analyst tests 100 computer components until they fail, and record their life lengths. How could the sample information be used to esti
Examine the values for the MAD and MSE in parts b and e. Which of the two forecasting techniques would you recommend the manager to use in order to forecast the number of new clients generated each