Statistics question and answers for January 17, 2024
- Q A prisoner is trapped in a cell containing 3 doors The first door leads to a tunnel that returns him to his cell after 2 days travel The second leads...
- Q here are two misshapen coins in a box their probabilities for landing on heads when they are flipped are espectively 0 4 and 0 7 One of the coins is...
- Q If X X X3 and X4 are pairwise uncorrelated random variables each having mean 1 and variance 1 compute the correlations of a X X and X X3 b X...
- Q A miner is trapped in a mine containing 3 doors The first door leads to a tunnel that will take him to safety after 4 hours of travel The second...
- Q A pond contains 100 fish of which 27 are carp If 15 fish are caught what are the mean and variance of the number of carp among the 15 What...
- Q Suppose that the expected number of accidents per week at an industrial plant is 4 Suppose also that the numbers of workers injured in each accident are independent random variables...
- Q If E X 1 and Var X 3 find a E 4 x b Var 2 4X a E 4 x Type an integer or a simplified fraction
- Q Cards from an ordinary deck are turned face up one at a time Compute the expected number of cards that need to be turned face up in order to obtain...
- Q A fair die is rolled 20 times Calculate the variance of the sum of the rolls The expected sum of the 20 rolls is Type an integer or a simplified...
- Q A player throws a fair die and simultaneously flips a fair coin If the coin lands heads then she wins one third and if tails then she wins one half...
- Q 3 43789 145 9463 Lap to thousandths Lap to tenths
- Q If n 11 a 37 and s 4 construct a confidence interval at a 80 confidence level Assume the dat came from a normally distributed population Give your answers to...
- Q If n 20 30 and s 2 construct a confidence interval at a 99 confidence level Give you answers to one decimal place
- Q Express the confidence interval 61 3 5 3 in interval form Express the answer in decimal format do not enter as perceptr
- Q Researchers observed 50 random people brush their teeth and recorded the number of seconds each person spent brushing From the sample they found a mean time of 41 7 seconds...
- Q In a random sample of 185 elementary school students 39 could speak at least two languages This resulted in a 95 confidence interval of 0 32 0 46 If nothing...
- Q A confidence interval for the population mean number of jobs a person has before the age of forty was found to be 8 1 to 10 4 Find the midpoint...
- Q A student was asked to find a 99 confidence interval for widget width in mm using data from a random sample of size n 20 Which of the following is...
- Q In a survey 22 people were asked how much they spent on their child s last birthday gift The results were roughly bell shaped with a mean of 38 and...
- Q The city wishes to estimate the average commute distance for all city employees They collect a random sample of 64 employees and find a sample mean of 7 3 miles...
- Q The reading speed of second grade students in a large city is approximately normal with a mean of 90 words per minute wpm and a standard deviation of 10 wpm...
- Q The accompanying data represent the monthly rate of return of a certain company s common stock for the past few years Complete parts a and b below Click the icon...
- Q A sample was done collecting the data below Calculate the standard deviation to one decimal place X 30 23 5 20
- Q If a person invests 2 000 at 3 interest compounded monthly how long will it take for the investment to grow to 3 000 Use the formula 4 1 P...
- Q A sample was done collecting the data below Calculate the standard deviation to one decimal place X 21 9
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