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One method for straightening wire before coiling it to make a spring is called "rooler straightening". Suppose a sample of 16 wires is selected and each is tested to determine the tensile strength. the resulting sample mean and standart deviation are 2160 and 30 respectively.
The monthly cost of a long distance phone plan in dollars is a linear function of the total calling time in minutes. When graphed, the function gives a line with a slope of 0.11.
Which distribution should be used to create 80% confidence interval?
Founder of modern probability and statistics theory Cardano asserted that if one throws a die three times the chance that a given number will show at least once is 50 percent. This is now recognized as the wrong answer. Calculate, what is a probab..
A test was conducted to determine whether gender of a spokesperson affected the likelihood that consumers would prefer a new product.
The university policy department must write, on average, five tickets per day to keep department revenues at budgeted levels. Suppose the number of tickets written per day follows a Poisson distribution with mean of 6.0 tickets per day. Find the p..
If 100 percent of a days production is inspected whenever the sample of 10 gives 2 or more defectives, then what is the pobability that 100 percent of a days production will be inspected?
Describe the 5-Step Hypothesis Test for a particular claim related to your work or life environment. (This should be a test of one-sample mean or one-sample proportion.
The number of smokers among 120 randomly selected students will vary from group to group. Explain why that number can be described wit a normal model.
Select the appropriate word to identify whether the measurement represents a categorical variable or a quantitative variable: The average number of minutes a person watches television each day.
Given a normal distribution with a population mean of 100, a standard deviation of 10 and a sample size of n = 25, what is the probability that X is
Determine the sample size needed in order to be 99% confident that the sample proportion of the current customer accounts is within .03 of the true proportion of all current accounts for this company.
Historically, it is known that the score has a Normal distribution and a standard deviation of 180. Set up the null hypothesis and the alternative hypothesis. Calculate the test statistic and find the p-value.
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