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The phone lines to airline reservation system are occupied 40% of the time. Assume that the events that the lines are occupied on successive calls are independent.
What should the mean weight be if the historic standard deviation is 1.65 grams?
A furniture warehouse buyer should decide whether to accept shipment of 50 tables. The decision is based upon inspecting random sample of five tables.
Explain similarities and differences between association and causation for this equation: E=1,000 + 0.1Y.
Examine all regression coefficients in this expression:
If samples of size n = 16 are choose from population with m = 40 and s = 8, the distribution of sample means will have expected value of 40. True or False?
A test correctly identifies a disease in 96% of people who have it. It correctly identifies no disease in 92% of people who don't have it. In the population, 4% of people have the disease. Determine
A team of geologists plans to determine the weights of 270 rocks. After weighing each rock large number of times, they will calculate a 90% confidence interval for its weight.
Using the 68-95-99.7 rule, what is the approximate percentage of lightbulb replacement requests numbering between 38 and 52?
The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a
About 2% of population has a specific genetic mutation. 300 people are randomly selected. Find the standard deviation for the number of people with the genetic mutation in such groups of 300.
About 5% of the population has a specific genetic mutation. 500 people are randomly selected.
Let W be a random variable giving the number of heads minus the number of tails in three tosses of a coin. Assuming that the coin is biased so that a head is twice as likely to occur as a tail.
In a study comparing means of 4 groups, the F ratio was significant at the p<.05 level. The 4 means are Mean 1=13.12; Mean 2=9.31; Mean 3=13.65; and Mean 4=11.34.
A box contains three cards. One card is red upon both sides, one card is green upon both sides, and one card is red upon one side and green on other. One card is chosen from the box at random,
Determine the probability that the percent of 18 to 34-year-olds who check Facebook before getting out of bed in the morning is at least 30.
An 1868 paper by German physician Carl Wunderlich reported, based on over a million body temperature readings, that healthy adult body temperatures are approximately normally distributed with mean 9
Monkeys male heights are upon average 75 inches with standard deviation of 5 inches. Monkey females heights are upon average a bit shorter and less variable, with mean height of 70 inches and standa
Employ the normal distribution to approximate the binomial distribution and determine the probability of getting 15 to 18 heads out of 25 flips.
A study on the effects of tevelision -viewing upon childern reports that childern watch mean of 4.0 hours of TV per night. Linda thinks that the mean number of hours childern in her neighborhood wat
A new speed limit will be initiated such that approximately 10% of vehicles will be over the speed limit. Determine the new speed limit based on this criterion?
In large statistics class, students have taken two exams. For each of following situations, report what you would expect for value of correlation coefficient between exam 1 score and exam 2 score. G
40 students take chorus class, The teacher for chorus randomly selects half the students to sing on Team 1, and the remainder of the students to sing on team 2. Suppose 10 students in the class are
In a certain college, 55% of the students are women. Assume we take a sample of 2 students. Determine the probability with 4th decimal accuracy that at least one of the 2 chosen students is a woman.
The human gestation period (length of pregnancy) is 270 days with standard deviation of 9 days and is approximately Normlly distributed (assuming spontaneous labor). Determine the probability that r