Y¯ be the means of
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Suppose that X¯, Y¯ be the means of 2
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- The life of a certain type of electronic component isnormally distributed with mean=220 hours deviation of 25 hours. Do you agree that the probability that the mean life of sample of 20 components will be greater than 225 hours will be higher than probability that themean life of a sample of 40 components will be greater than to 225 hours? Show by calculations.From a population of 4 students, a random variable (X) is measured in terms of age and the values of X are 24, 20, 22, 18. Find the sampling distribution where n = 1 Compute for the Variance when n=1The migratory habits of zebra in the savanna are normally distributed with a mean of 238 days and a standard deviation of 13 days. Find the probability a single zebra will migrate in les than 220 days.
- Suppose we want to test the hypothesis that mothers with low socioeconomic status (SES) deliver babies whose birth weights are different from normal. To test this hypothesis, a random sample of 100 birth weights is selected from a list of full-term babies of SES mothers. The mean birth weight is found to be 115 oz. Suppose the average birth weight of all babies (based on nationwide surveys of millions of deliveries) is known to be 120 oz with = 24 oz. Set = .05 Assume all conditions are met, what is the p-value of their test? Give your answer to 4 decimal places.Use this information about the overhead reach distances of adult females: µ = 205.5 cm, σ = 8.6 cm, and overhead reach distances are normally distributed (based on data from th Federal Aviation Administration) If 40 adult females are randomly selected, find the probability that they have a mean overhead reach between 204.0 cm and 206.0 cm.Don't know how to solve
- The means of two random sampleof sizes 9 and 7 are 196.42 and198.82 respectively. The sum of squares of the deviation from respective mean is 26.94 and 18.73. Can the sample considered to be drawn from the same normal population.Suppose that the fraction of defective modems shipped by a data-communications vendor has an approximation beta distribution with a=5 and b=21. find the mean and variance of the fraction of defective modems per shipment What is the probability that a randomly selected shipment will contain at least 30 % defectives? What is the probability that a randomly selected shipment will contain no more than 5 % defectives?Suppose X ~ N(6, 2). What value of x is two standard deviations to the right of the mean?