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An experiment was conducted to find out the strength of certain type of braided cord after weathering. The strengths of 56 pieces of cord which had been weathered for 30 days were investigated. The
A telephone answering service records length of each call. A random sample of 12 reports yields a mean length of 3.2 minutes with standard deviation of .7 minute. Compute a 95% confidence interval f
Twenty students are entitled for free after school tutoring. A simple random sample of five is selected. How many different simple random selections are possible?
In random sample of 150 clerical workers, 30 show an intense dislike for their jobs. Compute a 94% confidence interval for proportion of clerical workers who show an intense dislike for their jobs.
Suppose that prices of certain model of new homes are normally distributed with the mean of $150,000. Find out the percentage of buyers who paid more than $154,800 if the standard deviation is $2,40
Use E = $136 and a confidence level of 99% and known standard deviation (sigma) of = $503. Find the minimum sample size to estimate an unknown population means M.
Suppose that the flaws along magnetic tape follow a Poisson distribution with a mean of 0.2 flapper meter. Let X denotes the distance between two successive flaws.
A manager of small store wanted to discourage shoplifters by putting signs around store saying "Shoplifting is a crime!" But, he wanted to ensure this would not result in customers buying less.
Supposing that Richard guesses on all 7 questions, find the probability that he will answer at least six questions correctly? Round your answer to the nearest thousandth.
Of these 17 trucks, 6 have brake problems. A sample of 5 trucks is randomly selected. Determine the probability that 2 of those tested have defective brakes?
Does this give evidence that one class carries out at a higher level than the other? Confirm your response with the hypothesis test and a 95% confidence interval.
An average ACT scores or Ohio students who took the test in 2003 was 21.4. Assume o= 1.05. In a random survey of 25 students who took the exam in 2003, determine the probability that the average com
The mean brain volume for the group of healthy adults is gathered and the mean brain volume of adults diagnosed with obsessive-compulsive behavior is as well obtained. The results are listed below.
Given the following information regarding the raise in revenue for top companies x compared to the pay CEO's receive y.
The quality-control inspector of production plant will reject batch of syringes if two or more defective syringes are found in random sample of 9 syringes taken from the batch. Assume the batch cont
The number of people who enter elevator on the ground floor is Poisson random variable with mean ten. There are 5 floors above the ground floor, and each and every person is equally likely to exit t
Richard has been given a nine question multiple-choice quiz in his history class. Each and every question has four answers, of which only one is accurate. Since Richard hasn't attended the class rec
In order to find out the effect of certain oral contraceptive on weight change, nine healthy females were weighed prior to start of the medication, and again at the end of a 3--month period. (S
In the study to test the effects of marijuana employ on mental capabilities, groups of light and heavy users of marijuana in college were tested for memory remembers.
A bank's loan officer rates applicants for the credit. The ratings are normally distributed with mean of 250 and standard deviation of 55. If an applicant is randomly chosen, determine the probabili
Test at the 1% significance level against appropriate one-sided alternative null hypothesis that job satisfaction has no linear effect upon absenteeism.
The average salary for first year teachers is $27,989. If the distribution is approximately normal with o = $3250 determine the probability that a randomly chosen first year teacher make these sala
From the normal table, the percentages for classes are 2.28%, 13.59%, 34.13%, 34.13%, 13.59%, and 2.28%, respectively. Do the observed frequency data give significant reason to discredit the hypothe
An intellectual society, HIGHQ, claims that it grants membership only to people whose IQ is at least 2.5 standard deviations above average. Determine the best upper bound which can be attained by Ch
The average number of unhealthy days based upon Air Quality Index, AQI, in the random sample of 10 metropolitan areas was 33.5 as well as sample standard deviation was 27.7 days. Determine the 98% c