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A manufacturer of watches has established that on the average his watches do not gain or lose. He also would like to claim that at least 95% of the watches are accurate to ±0.2 s per week. A random sample of 15 watches provided the following gains (+) or losses (-) in seconds in one week:
Can the claim be made with a 5% chance of being wrong? (Assume that the inaccuracies of these watches are normally distributed.)
instructions perform the 5-step hypothesis testing procedurehere are the steps that need to be followed amp the raw
A statistics professor planed her classes so carefully that the lengths of her classes are uniformly distributed between 45 and 55 minutes. Find the probability that a given class period runs greater than 50.25 minutes.
ESP. Scientists wish to test the mind-reading ability of a person who claims to have ESP. They use five cards with different and distinctive symbols.
Mr. R.C. Cola owns 7,001 shares of Soft drinks, Inc. There are 10 seats on the company board of directors, and the company has a total of 77,000 shares.
An urn contains 8 green and 7 black balls. Four balls are randomly drawn from the urn in succession, with replacement. That is, after each draw, the selected ball is returned to the urn.
Many educators feel their grades should fit a normal distribution and often apply curves to make them fit one. One way to do this is to convert numeric grades to z scores using the mean and standard deviation for the grades, then use an equation s..
Let X be a normally distributed random variable with µ = 100 and s = 10. Find the probability that X is between 70 and 110.
Develop a Venn diagram to illustrate the data, hence use it to find the probability that a worker picked at random: (1) Does not speaker English, (2) Speak neither of the languages, (3) Speak French and Russian but not English.
As a consequence over the last few years, Lowe's has been on a pathway of strategic renewal that consists of a transformational journey
Let X1 and X2 constitute a random sample from a normal population with σ2 = 1. If the null hypothesis μ = μ0 is to be rejected in favor of the alternative hypothesis μ = μ1 > μ0 when x > μ0 + 1, what is the size of the critical region?
There is no proof the new policy is more effective, but we cannot finish the policy has no effect on smog. Interpretation of P-value for the given context.
A metropolitan school system consists of two districts- north and south. the north district contains 60% of all students, and the south district contains 40% of all students.
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