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A special industrial battery must have a life of at least 400 hours. A hypothesis test is to be conducted with a .02 level of significance. If the batteries from a particular production run have an actual mean use life of 385 hours, the production manager wants a sampling procedure that only 10% of the time would show erroneously that the batch is acceptable. What sample size is recommended for the hypothesis test (0 decimals)? Use 30 hours as an estimate of the population standard deviation.
What is the probability that none can transact business in a foreign language?
The following frequency table lists the sales of an item and the number of times it has occurred. It was obtained from historical records.
A local health center noted that in a sample of 400 patients 80 were referred to them by the local hospital. What size sample would be required to estimate the proportion of hospital referrals with a margin of error of 0.04 or less at 95% confiden..
What are the four levels of measurement scales? Give examples of each and explain in detail. Explain the use of normal probability plot to evaluate whether a set of data is normally distributed? Please discuss in detail.
When making the histogram from frequency table, (a) what goes along the bottom, (b) what goes along the left edge, and (c) what goes above each value?
The data in the next table resulted from an experiment that used a completely random design. Test the null hypothesis that u1 = u2 = u3, where ui represents the true mean for treament i, against the alternative that at least two of the means differ..
Population of consumers where 30% of them favored a new product and 70% of them disliked it. If 20 persons are sampled, what are the probabilities of finding: Binomial
A researcher looks at the effect of 3 different drugs on 3 different groups of 10 people. Numbers refer to stress levels, with lower numbers being lower stress.
A random sample of n=9 men between 30-39 years old is asked to do as many sit ups as they can in one minute. The mean number is x=26.2 and the standard deviation is s=6. Find a 95% confidence interval for the population mean.
Compute the probability of receiving four calls in a five-minute interval of time. Compute the probability of receiving more than 10 calls in a five-minute interval of time.
What would be the critical value under the null hypothesis if the size of your test were 5%?
Probability of .2, $15 with a probability of .35. How much should the lab budget for next year's rat orders assuming the distribution stays the same.
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