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On the average, 1 computer in 800 crashes during a severe thunderstorm. A certain company had 4,000 working computers when the area was hit by a severe thunderstorm. Compute the probability that les
Compute the values of the three quartiles and the interquartile range. Calculate the(approximate) value of the 35th percentile.
Several statistical tests have a way to measure effect size. What is this, and when might you want to use it in looking at results from these tests on job related data?
Fit both logistic and probit models, modelling proportion killed as a function of nicotine concentration. Are there any obvious differences in the fit of these models?
The following data give the number of computer keyboards assembled at the Twentieth Century Electronics Company for a sample of 25 days.
Prepare a box-and-whisker plot for the following data.
Investigators designed a "physical activity intervention" to increase physical activity at school and at home. They also designed a "nutrition intervention" that improved school lunches and offered
Data from the years 2000 through 2009 shows a strong, positive association between consumption of cheese (in U.S. per capita pounds per year) and the number of people who died by becoming entangled
The function F(x) = k(1-(1/2)^[x]), x > 0 is the distribution function for a discrete random variable X. Here, [x] denotes the interger part pf x (i.e., the greatest integer less than or equal t
To assess the opinion of students at the Ohio State University about campus safety, a reporter for the student newspaper interviews 15 students she meets walking on the campus late at night who are
The distribution of Iowa Test vocabulary scores for seventh grade students in Gary, Indiana, is approximately Normal with mean ? = 6.84 and standard deviation ? = 1.55. The 68-95-99.7 Rule says the
High levels of cholesterol in the blood increase the risk of heart disease. For 14-year-old boys, the distribution of blood cholesterol is approximately Normal with mean ? = 170 milligrams of chole
Can you conclude that the mean germination time for pelletized seeds is less than the mean for the un-pelletized seeds? Use the alpha = .05 as the level of significance.
A company produces packets of soap powder labeled "Giant Size 32 Ounces." The actual weight of soap powder in such a box has a Normal distribution with a mean of 33 oz and a standard deviation of 0.
A researcher wants to perform a hypothesis test to determine whether the mean length of marriages in california differs from the mean length of marriages in texas. Identify the variable for the prop
If 0.8% of the fuses delivered to an arsenal are defective, use the Poisson approximation to determine the probability that 4 fuses will be defective in a random sample of 400.
Suppose IQ scores were obtained from randomly selected siblings. For 20 such pairs of people, the linear correlation of coefficient is 0.880 and the equation of the regression linearis Y^=5.71 + 0.9
The margin of error will increase because the critical value will increase. The increased margin of error will cause the confidence interval to be wider.
A fair coin is tossed 10,000 times. Find a number m such that the chance of the number of heads being between 5000-m and 5000+m is approximately 2/3.
Find the standardized scores for both students. Assuming that both tests measure the same kind of ability, who had the higher score? (choose the best answer)
What is the probability that a home loan extended by La Crosse has an adjustable rate and is for a term of 15 years? What is the probability that a home loan extended by La Crosse is for a term of 15
Brian, a landscape architect, submitted a bid on each of three home landscaping projects. He estimates that the probabilities of winning the bid on Project A, Project B, and Project C are 0.8, 0.5,
In a home theater system, the probability that the video components need repair within 1 year is 0.04, the probability that the electronic components need repair within 1 year is 0.006, and the prob
Each of four persons, named 1,2,3,4 fires one shot at a target. Let Ak denote the event that person K hits the target,where K=1,2,3,4. Assume A1,A2,A3,A4, are independent events .If P(A1)=0.7 , P(A2