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Suppose that a certain college class contains students. Of these, are sophomores, are social science majors, and are neither. A student is selected at random from the class.
(a) What is the probability that the student is both a sophomore and a social science major?(b) Given that the student selected is a social science major, what is the probability that she is also a sophomore?
Write your responses as fractions.
A group of three students is to be randomly selected froma group of 1 freshman, 1 sophomore, 3 juniors and 3 seniors. Let Y1 and Y2 denote the number of juniors and seniors, a) What is the joint probability distribution for Y1 and Y2?
The possible responses to the question "How would you rate our quality of service?" with 1=excellent, 2=good, 3=fair, 4=poor, describes what type of variable?
The confidence interval estimate of the population mean will be __________ for a 95% confidence level than for a 90% confidence level. Narrower or Wider?
A statistical study reported that a drug was effective with a p-value of .042. Explain in words what this tells you.
Carry out the suitable hypothesis test, at alpha = .05, to find out whether there is a relationship between school/work and stress.
A thermometer is randomly chosen and tested at 0 degrees C. What is the probability of a reading of less than -2.75 degrees C?
Two teams of workers assemble automobile engines at a manufacturing plant. Quality control personnel inspect a random sample of the teams assemblies and judge each assembly to be acceptable or unacceptable.
Utilize the given degree of confidence also sample data to construct a confidence interval for population proportion.
Speaking to a group of analysts in January 2006, a brokerage firm executive claimed that at least 70% of investors are currently confident of meeting their investment objectives.
Find the sample size for the 95% confidence interval used to estimate the population proportion.
It is not unusual for a battery to have life span that is more than 2470 hours as the z-score is within 2 standard deviations of mean.
Would it be reasonable to conclude that the population mean is 63 pounds?
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